Calculator APK

Version 7.8 (271241277) -
Last updated: 2020-07-05

A simple calculator utility for Android

Calculator apk

APP Information

Download Version 7.8 (271241277) (78000303)
Apk Size2.58 MB
App DeveloperGoogle Inc.
Malware CheckTRUSTED
Install on Android6.0 and up

Download Calculator 7.8 (271241277) APK

App Description

Calculator is google,android,calculator,tools, content rating is Everyone (PEGI-3). This app is rated 4.59 by 37 users who are using this app. To know more about the company/developer, visit Google Inc. website who developed it. apps can be downloaded and installed on Android 6.0 and higher Android devices. The Latest Version of 7.8 (271241277) Available for download. Download the app using your favorite browser and click Install to install the application. Please note that we provide both basic and pure APK files and faster download speeds than APK Mirror. This app APK has been downloaded 1497507+ times on store. You can also download APK and run it with the popular Android Emulators.

Calculator provides simple and advanced mathematical functions in a beautifully designed app.

• Perform basic calculations such as addition, subtraction, multiplication and division
• Do scientific operations such as trigonometric, logarithmic and exponential functions

App ChangeLog

  • • Dark theme available
  • • Various bug fixes and improvements

App Screens

Calculator App Screen 1Calculator App Screen 2Calculator App Screen 3Calculator App Screen 4Calculator App Screen 5Calculator App Screen 6Calculator App Screen 7Calculator App Screen 8Calculator App Screen 9


requires following permissions on your android device.

view network connections
Allows the app to view information about network connections such as which networks exist and are connected.

measure app storage space
Allows the app to retrieve its code, data, and cache sizes

full network access
Allows the app to create network sockets and use custom network protocols. The browser and other applications provide means to send data to the internet, so this permission is not required to send data to the internet.

prevent phone from sleeping
Allows the app to prevent the phone from going to sleep.

read Google service configuration
Allows this app to read Google service configuration data.

Older Versions

More Android Apps to Consider

Google Play Reviews

  1. Lee Geiger-avatar

    Very good calculator, it looks so simple, but does complicated calçulations, if you want a good scientific calculator, with 50 digits of accuracy, this is great. after you download, later it will later give a free upgrade, so you can have a dark background to work on, this m,akes it more comfortable to the eyes.

  2. Daniel Pierce-avatar

    online The factory version had order of operations wrong, fixed now, which is why there are updates. They also fixed some other complaints, like adding a few color themes and adding more operators, like scientific, in landscape mode (rotate your phone to use those). Also, doesn't have any special permissions.

  3. Richard Spalding-avatar

    Richard Spalding


    app This app shows very long numbers to the 'power of 10'. This makes it impossible to read and understand the number quickly (unless you are a mathematician that uses this concept frequently). I literally just want to see my really long number in full with comma separators (hint, make the font size smaller!)

  4. Warren Williams-avatar

    Warren Williams


    salariu The app looks neat and easy to mange but i had to disable the app out of frustration because i couldn't figure out where the back or erase option is if i had an extra number and wanted to erase it before adding etc. I am doing some work on Google Sheets & i am calculating some numbers but if i can't erase an extra number from screen or clear screen entirely, it only takes up extra time i can't afford right now. Will install again if someone explain how to erase an extra # or clear entire screen

  5. I'mHISand HEisMine-avatar

    I'mHISand HEisMine


    deutsch Hi All🙂 I do appreciate the fact that there are absolutely no adds. The calculator keeps a history if you mistakenly clear the screen. It would be nicer to have a percentage option when you need to figure out amounts and prices. I'm not a math genius😄 I thank GOD for the most part it works for the basic essentials for me. Also, thanks Android and Google for this application🙂👋🏾

  6. Dr पारस सिंह-avatar

    Dr पारस सिंह


    sarcina A simple calculator utility for Android Calculator provides simple and advanced mathematical functions in a beautifully designed app. • Perform basic calculations such as addition, subtraction, multiplication, and division • Do scientific operations such as trigonometric, logarithmic, and exponential functions

  7. The Kids Adventure-avatar

    The Kids Adventure


    windows 10 It's very useful no ads comes on your phone you don't even have to download it it is a calendar you add anything you want if you just like stuck on a problem or you need help like if you're trying to measure something then easily just do it and it'll help you solve your math problems in school just don't cheat like solve another math problem to solve that math problem if you use this use it to good use and please don't see cuz this is a good app thank you

  8. Braxton Ashby-avatar

    download I give this app 3 stars because it is to simple and for 2 it does not have the symbols to do all math and for 3 you can't do the math work with it if your doing certain things you can't do math for something if there is no symbol for that math like units and meters and and also fractions and finally you can't do time so 3 stars for your dumb app

  9. Tapas Kar-avatar

    google Pretty good calculator app from google. But it lacks of unit converter (length, mass, volume etc.) and currency converter. Pretty Disappointed for stock android experience cause user have to use separate app for those features. Hope team understands that what users need. Thank You team Google

  10. Betty Roos-avatar

    icon This is a god device, even for my number challenged brain. Not sure of answers, but truly, this is as easy to use-easier, in fact,- than carying a separate calculator. The fact that i can increase the number sizes, alone, makes this a huge improvenent for me, one i am sincerely glad to have on my phone.

  11. Jeremiah Walter-avatar

    Jeremiah Walter


    Simple, elegant, beautiful. I love the new Material Design. Having the ability to pull up history, as well as, copy and paste; has extremely useful benefites. The easiest calculator to use in the Play Store. Then again, anything "Made by Google" is the best.

  12. Josh Demyanovich-avatar

    Josh Demyanovich


    The design is great and the haptic feedback is a plus but I'm on a OnePlus 7T and the scientific part does not come in from the side like shown in the pictures and I'm unable to hide it so it's always on.

  13. Cindzzz-avatar

    It's simple and effective except that I can never find it because of the display picture, it just kinda blends right in with everything else and it makes me nuts.

  14. James Himes-avatar

    I just used this calculator app today. I found that there was a discrepancy in my money. Not only that, Chrome uses the calculator and clock in sequence. I resisted for years on syncing my accounts passwords and apps. I think I might have a hard head but I think I have finally come around.

  15. Ana E Cruz nazario-avatar

    Ana E Cruz nazario


    Using everything is nice calculated keeping keeping your numbers unsafeA simple calculator utility for Android Calculator provides simple and advanced mathematical functions in a beautifully designed app. • Perform basic calculations such as addition, subtraction, multiplication, and division • Do scientific operations such as trigonometric, logarithmic, and exponential functions

  16. Amit Saha-avatar

    Good but not Great Calculator because missing some important useful features is- 1. Currency calculation 2. Volume calculation 3. Length calculation 4. Weight and Mass calculation 5. Temperature calculation 6. Energy calculation 7. Area calculation 8. Speed calculation 9. Time calculation 10. Power calculation 11. Data calculation 12. Pressure calculation 13. Angle calculation Freatures. I request you plz add these useful freature for smarter Google Calculator.

  17. Nate Tobin-avatar

    It performs well. I would give it 5* but no matter how many times I update it, I continue to be prompted to update again. It claims the latest update was Sep of 2019. Seems awful suspicious to me...

  18. Julian-avatar

    Way too complicated. A technical calculator for people planning to fly to the moon. It gives answers in decimal and in fractions - with no means of choosing the option you go for. Horrible. Would love to uninstall but is bloat ware on my Google phone. Avoid - if you can!

  19. The Kruegz-avatar

    This app was operating just fine. It was my go to calculator. But after the update all the scientific functions are displayed and you can't minimize them. Because of that this app must be chopped. Developer, please cover your keyboard and turn off your monitor.

  20. Patricia Collins-avatar

    Patricia Collins


    Yes, this is just what I want - big and clear and easy to use. Scientific ones are great, but ninety percent of the time I only want a basic calculator. Despite what another reviewer said, it does have a percentage button.

  21. Calcaware-avatar

    Great calculator of course, but needs support for night mode using black for AMOLED screens like the pixel devices. Using system default accent colors if available would be really nice, too. // Get System Accent Color if Available TypedValue value = new TypedValue(); Context ctx = new ContextThemeWrapper(context,; ctx.getTheme().resolveAttribute(android.R.attr.colorAccent, value, true); return;

  22. Daniel English_07-avatar

    Daniel English_07


    It's nice and stock , it has really fine UI. High speed and every other thing which other Google apps have. But it's expected from Google to have more powerful apps. This calc really needs a unit converter and also more options in advanced mode

  23. Alfian Nugraha-avatar

    It doesn't good in split screen. I use LG V30+. When i use the split screen mode, the calculator keep on full screen mode. I tried to send feedback, but i can't add the screenshot that show the trouble.

  24. Trevor Schauer-avatar

    why would a calculator app need so many updates? i can understand updating the theme every once and a while, but I've had 2 updates this month and more over the last several months. what the hell is going on? its just a calculator app. its not like math changed or any thing!

  25. Anita Rosin-avatar

    The updates added advanced calculations that can't be minimized and removed the basic functions we use every day. What happened to the memory button? Memory and clear are more useful than advanced functions. Please add those. For now I'm looking for another calculator that's just a calculator.

  26. Spidey Whiplash-avatar

    Spidey Whiplash


    It's almost easier to use a abucus.🤪 Therefore, I would pay Google to have a way to clear my calculations, in order to input a new calculation. Because pressing the x button repeatedly is insane. On my old phone this app worked perfectly. Now that I updated I wonder why Google did not.🤔

  27. Joel Davis-avatar

    Love my calculator use it several times a month to help me maintain and keep up with my budget. It has always worked well no bugs and think I would never have my bills payed correctly without it and it allows me to help my daughter with her homework sometimes. What else needs said greatfull for it

  28. Albert Badia-avatar

    Great calculator app, simple Google design and gets everything done. Would be nice if you followed in the steps of the Windows Calculator and added conversion calculations, but that's all in terms of features. No major complaints here.

  29. Tha Thankful1-avatar

    Calculator is amazing. It calculates whatever you are typing in as you input it. Plus you can easily fix mistakes, without having to start over. Well done!

  30. Clean Pool Service-avatar

    Clean Pool Service


    I love it but for some reason the perfect symbol vanishes from de Mai screen and y have to look for it in the side menu. Can someone help me? I tried to update it but there are no updates available.

  31. Sonia Neira-Matthews-avatar

    Sonia Neira-Matthews


    Didn't understand how does a phone requires to download an app for a calculator., shouldn't it be part of the software of the cell?? I never downloaded the app it's there, is very basic nothing special just a regular calculator. I can't do more than percentage, is nothing like to use at a university level.

  32. firewaffle1-avatar

    pick a character and then pick up the pair of binoculars and find the treasure marked by the X obviously but be careful because as soon as you get the treasure there is this snake thing but it's ok because you can pick up the axe or the bow or the arrow and kill it then see what you got!... Hey I got a new high score! There is a couple of little glitches with certain commands the bow and the balloon 💥💥💥💥

  33. lucy baws-avatar

    Could be a lot better considering its 2020, it's not even a scientific calculator but it's neither basic enough because it add a comma after certain numbers which looks weird so you get 20,20 - 19,82 = 37. I have a much better calculator that has virtually every scientic , money weight you name it converter, money , fuel prices and for a "simple / basic calculator app " this does not cut the mustard for help with exams or homework.

  34. R MH-avatar

    Works. Simple, easy to use, never had any problems with it. Like how easy it is to view history of calculations. As long as the update I'm finally getting around to doing doesn't cause any problems, the 5stars is fully earned and legit.

  35. Tracy Thompson-avatar

    This update isn't bad. Reading the reviews I thought it was going to be terriblebut it's not it's easy to work it has everything you need right there for simple calculator if you need them more complicated stuff you just slide a screen over they done a great job with this new app.

  36. Vinodchinna Vinodchinna-avatar

    Vinodchinna Vinodchinna


    Really it is helpful to calculate any stuff in seconds and also there is history option which helps us to check it out where the mistake is. I hope this is the good one.

  37. Samantha Cahill-avatar

    Samantha Cahill


    The app is fairly basic. Just wish it would give an option to choose a type of calculator so it made doing different kinds of math much easier, but as a basic calculator goes it does the trick. Also would love to be able to customize the theme

  38. Stijn Algoet-avatar

    Much better than the stock OnePlus calculator! Haptic feedback on any keypress, always available sin/cos/tan etc, swipe gesture for viewing past calculations and full support for dark/light and system theme No nonsense good calculator! Would be nice if one could adjust the size of the buttons though...

  39. Ron Mackenzie-avatar

    This calculator may be great for an engineer but for the average person there is no need for all the scientific notation. I would like to have metric conversion that seems to be missing from this one. I'm disabling this one.

  40. Kara Sylvester-avatar

    Can't get it to look normal (like it does in the screen shot). Can't just clear the calculations, have to close the app out totally and start over.

  41. Rene Kirstein-avatar

    Another bloatware app cluttering my phone... I prefer my own calculator app which I have paid for. So now I sit with calculator apps and I cannot delete this one which is useless compared to the one I have. I really resent being forced to have apps I don't want,.

  42. Vincent van der Tuin-avatar

    Vincent van der Tuin


    Silly, doesn't behave like you would from an ordinary desktop calculator, for instance requiring Polish notation for square roots (root symbol first, that is, like you would write it on paper, rather than how you would enter it on a regular calculator, i.e. number, then operator). The features are also very limited. Where is base conversion, for instance? Surprising to see you can get such a seemingly simple app wrong.

  43. Alec Pucillo-avatar

    Very basic, it would be nice to have a "Clear" button and an additional converter options.

  44. David Adams-avatar

    It's a simple calculator with a very clean interface. I was hoping that it'd have unit conversions (e.g., pounds to kilograms), but it does not and I need that feature. Back to Samsung's calculator app I go.

  45. Luca Pignataro-avatar

    For some reason the C and CE buttons disappeared no settings hidden menus. I choose help and was of no help, I google it and could not find anything. I had to download a different calculator app.

  46. Marty Pickell-avatar

    After a big update on my phone, I noticed my calculator app was missing. So I had to reinstall. And it is now so much different than it was before. It's so cluttered by extras and I really don't like it. Why not give the option to turn all the extra features off and on? I don't need all that, I just need a basic calculator. And what happened to the clear button?

  47. Traci Lester-avatar

    I absolutely HATE the update to the calculator. We seriously need the option to turn OFF the decimal/fraction update if we don't want it. I've resorted to removing all updates and stopped auto updates just to have the old version!!

  48. Katie Bea-avatar

    Beyond sucks ... Doesn't do simple math correctly. RAD and DEG only options & Updating doesn't fix. It USED to add and subtract and divide and multiply accurately, but SOME update or other issue has ruined simple math strings. The app needs to be FULLY able to be DELETED AND FULLY REINSTALLED (if) I want it EVER again ... MULTIPLE FEEDBACKS to developers is a NO FIX, too. So; I am here ranting. CODE this so it can be removed from the phone. And while your at it, kill NFL app and other JUNK APPS

  49. Paul Medway-avatar

    To the comment regarding exponentials, if you turn your device into landscape, you get longer numbers before the app shows numbers in exponential format.

  50. G.C. Barnett-avatar

    Simple and ad-free. Google's design language is clean and intuitive.

  51. Elizabeth H-avatar

    It was ok until the system update. The format changed, now has answer on top in decimal and wierd fractions, big bar of signs i don't need in the middle, and smaller numbers on the bottom for doing calculations. If i have to do the system update for security, why does the format for simple apps like this have to change? Why?? Installed a more user-friendly calculator app and moved this to a folder of pre-installed apps that i don't use.

  52. satyavathi Nimmagadda-avatar

    satyavathi Nimmagadda


    It is a very good calculator which has all options to add , subtract, multiply etc it is a very good app and dont make a back step to use itit is one of the best app for me to calculate

  53. Joann Redding-avatar

    The calendars are a must I must is really comforting to know you can go into the stores and put your calendar on and price your merchandise keeping up with the the cost as you go along shopping is one of the best ideas I I see on Facebook. On the smartphones. I really do like this by the time I get to the restroom. I already know how much my bill is going to be is very convenient. Thank you.

  54. Dheemant Joshi-avatar

    The layout of the numbers and the signs are comfortable but there is a lack of options to calculate things in different units like cm,liters,etc

  55. Ram Singhania-avatar

    Great app, just felt if conversions were available, it would have been my best calculating app.

  56. Nicholas Houben-avatar

    Nicholas Houben


    Exactly what we (I was) are looking for. Simple, easy, gives the answer as you type and NO POP UP'S (atleast not so far). Highly recommend this app.

  57. Betty Baun-avatar

    I cannot get the simple calculator funtion to work for me. A shame because the advance math features are very easy to use. In my case I need the simple math function.

  58. Mommy Amber-avatar

    Comes in real handy when trying to budget you're monthly income and it's unfortunate, but all too real, that it must be budgeted to the exact penny. I like calculator a lot.

  59. Lester Bell-avatar

    I don't use it much, but when I do use it, it's working just fine for my Motorola Moto E5 Play cellphone running Android 8.0 apps for Google play store and my Android device.

  60. A.S.M Perves Ahmed-avatar

    A.S.M Perves Ahmed


    Very good app excellent app everyone and every student of each class can use it it is not only used in educational purpose but also for other household or other purposes My children doesn't make any mistakes in their subjects through using this brilliant app They are very app The inventor of this app made a brilliant idea for making this app It makes the counting easier for students It doesn't contain any kind of ad I was in a kind of tension for my kids but Now I'm tension free Thank you ♡♡♡♡♡

  61. Dale Daniel-avatar

    It works fine. But, it needs a clear key and clear entry key. The only way to do multiple calculations is to close and open the app.

  62. ToMi Consulting-avatar

    ToMi Consulting


    Works fine. Just having trouble figuring out how to get the app on my phone's "desktop" instead of having to open it with GooglePlay everytime I need to use it.

  63. James Kelly-avatar

    I do use this app to figure out things like sales tax or to check it. Works well if I have a grandchild here we both do problem to see if it's right.

  64. Abdul Mannan-avatar

    it is not a good app developers are reading my review please please don't take it otherwise that can you make it better that you can calculate BMI convert meters into kilometers in something that conversions that are used in mathematics like the mi calculators are you can make it something like that please I need that many dimes so for that I am not using this application much as I downloaded am I calculator on my iBall tablet

  65. Emilien Breton-avatar

    Simple yet effective app. Very convenient to be able to write 'sin(x)' instead of 'x' and then 'sin', like in many other calculators. My only complaints would be the lack of some mathematical functions (like modulo, abs or round) and the absence of base convertion.

  66. Lwazi Magwa-avatar

    Excellent app, better than the one pre-installed, the problem with the pre-installed one it does not show history, I can't track my previous calculations.

  67. Sujit Maurya-avatar

    Not upto the mark. Google should work on updating it app. There are many apps providing inbuilt conversion, scientific calculations etc. But google is stuck with its old app till date.

  68. Blue Kenny Conmers-avatar

    Blue Kenny Conmers


    Ive had Pandora for 3 to 4 yrs off and on trying others copying pandora but always come back. Just enjoy you can find in all of them but their sound is off the charts..thank you Pandora

  69. Abraham Lincoln-avatar

    Abraham Lincoln


    Another Google privacy invasion. Uses foreground and background internet data even if the phone's app settings are set to block background data. No mention anywhere about what data is being sent. Why would any honest calculator need to send internet data when it's not being used???

  70. Trent Glasgow-avatar

    This app does the bear MINIMUM to be a app, the only reason it got 2 stars instead of one is because its Damm easy to use for quick problems, but thats not saying much becuse of just how little content there its USELESS FOR ALGEBRA.

  71. Carmen Lombardi-avatar

    Carmen Lombardi


    Its important to have this particular useful app . Especially when you dealing with calculating expenses or math problems and want to make sure you figured it out correctly!

  72. Hassan Al-Ghafli-avatar

    Hassan Al-Ghafli


    Simple and easy and does the job. There must be better and more capable calculators in the store but this one is good for small calculations.

  73. Atul Gadekar-avatar

    App is good but requires some UI modifications in arrangements of numbers and functions, more sized buttons should be present and as it is Google calculator users expect some good look and feel and functionality.

  74. Ayoku Sweeney-avatar

    I don't like that I can not turn off the decimal information. It's not necessary for my use. I'm tired of not having choices of how I use basic apps on my phone.

  75. Ananthu K-avatar

    Overall good...but need improve more features like currency convertor,discount ,mile convertor etc.. hopefully waiting for those features when u update ur app. i believe only google products which are very secure and comfortable..

  76. InstantRamen23-avatar

    It's a calculator with all the same basic functions a normal calculator has, with a few extra things like sin, cos, tan, ( ), and others. If you have a job or class that need to do complicated math for, this can help but isn't a complete replacement for Ti-whatevers and graph calculators. (Google please add an Ans button)

  77. Neil Haley-avatar

    Fantastic App., does what it says. No bloat or ads to get in your way.

  78. Samih Hayes-avatar

    Best calculator app by far. But it would be good if you also had a converter built in with it.

  79. Debby Spencer-avatar

    Hate it! This update completely destroys the functionality of the app. Why in the world would you force your users to see this mega huge displace of bable and scientific functions they don't need. There should be an option to turn it off. -1 star + suckage = APP.

  80. Emil Fabris-avatar

    Nice and simple calculator that's easy to use, I especially like the feature where you can look at your old equations.

  81. Matt Wiseley-avatar

    If the Android accessibility feature to zoom the screen with 3 taps is enabled, the key presses on the calculator have about a half second delay that is really distracting.

  82. Allen White-avatar

    This app does work properly, I just don't like the way it's setup. You just have to download and take a look. This is the default app on my phone

  83. Aryan Onkar-avatar

    UI looks weird in Oneplus 5t. Scientific calculator options stacked above number pad makes the UI look weird and complicated. Backspace and equals button arranged in second column aquires space that could be used to make the number pad bigger and spacious. UI should look similar to the sample image provided in Play Store

  84. CJ Jagodzinski-avatar

    The blue part with extra functions can no longer be hidden making the basic use too small to use properly. I can't believe I am now searching for a new calculator app. How can you ruin something simple?

  85. mirza imran baig-avatar

    mirza imran baig


    Not shown display like other apps very difficult find open.. you can't open directly is big problem ... I hope to resolve this issue

  86. Mark Munroe-avatar

    The calculator disappeared and I can't find it. "store" tells me it is installed and I can "open" it and use it, but outside "Store" I can't locate it.

  87. Mark-avatar

    Why does getting the average of this get different result, 5+5+5+5÷4=16.25 compare to this 5+5+5+5=20 then 20 ÷4 = 5. I may be stupid but I thought it would get same result. Please let me know if it's a glitch or I'm just stupid. Edit: I guess it added the first three 4s which is 15 then divided the last 5 with the 4 totaled to 16.25. Kind of weird, a different app calculator gives the correct answer when inputed the same way which is 5.

  88. Morbo Diseo-avatar

    I use this app regularly, to check my fuel economy(good indication of vehicle health). No ads, does what it's supposed to... What more can I ask?

  89. absdroid-avatar

    Literally basic of basics, with no modern features. Take some inspiration from Xiaomi's calculator, it has a floating option over everything. Wow, amazing!

  90. o-avatar

    The icon is depressing. Colours the equals sign but the rest is gray. This is the problem what's wrong with society, only focus on the result (equals sign) and not the process (operators). I know I'm "overthinking" but it is what it is.

  91. Pablo 3620-avatar

    As it is capable of giving answers in exact fractions values even when square roots or pi is involved it by far the best calculator for Android. However for some reason when using radian's tan inverse does not give the correct value which actually cost me some points on one of my University assignments before I realized this and so I had to go back to my graphics calculator

  92. Chris Devine-avatar

    Pointless feature I can't turn off. I have really no interest in seeing every calculation I do displayed as an incomprehensible and useless fraction.

  93. LJ Bulusan-avatar

    This app is so very amazing...but it has lack of features like temperature converter, angle measurer, geometrics and etc. I hope Google will make that features on the next update of this app...

  94. Austin Gudino-avatar

    Super easy calculator to use. Was already installed on my phone. Easy to pull up, and get quick answers for.

  95. Meer Zameer-avatar

    Excellent calculator app for general usage in daily life... The memory option in the app has made my calculations easy to recall.... I m satisfied

  96. பத்மநாபன் ர-avatar

    பத்மநாபன் ர


    Please add Days calculator for two dates. For Example. No of days between 06/04/2019 and 04/06/2020.

  97. Nick Walters-avatar

    I use the Calculator app often to do me monthly budget, it is dead on accurate and I love figuring out what I will have left to spend during the month

  98. Kaitlyn Johnson-avatar

    Kaitlyn Johnson


    Please make games with no ads. And no saying no ads but put ads in every 5 seconds

  99. Vijay Singh-avatar

    It's very tall and long, it should be in a square shape. So that it can be made easy to use

  100. S P-avatar

    Works in its own way like most of the google stuff - doesn't support unary operations on last result. Either enter whole equation from beginning, or copy-paste every time. Doesn't have 1/x function either. Good example of how to make simple app unusable