Karl's Mortgage Calculator
v3.11 · 3.1 MB · code 74
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File information
UpdatedJan 23, 2026
PublishedMay 6, 2021
Packagecom.drcalculator.android.mortgage
Versionv3.11 (74)
Size3.1 MB
MD52d5ab32bd2dca1686931f2cd05b3d0d4
Min SDK19
Malware scanTRUSTED
Signature SHA166:99:C3:EC:0F:DE:6E:95:AC:0D:FF:A2:70:CB:B1:14:3D:62:A0:86
SignerCN=Karl Jeacle, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown
Total downloads1,000,000
This version1,000,000
DeveloperDrCalculator.com
Age ratingEveryone
What's new in v3.11
- EU user consent for GDPR
- Minor fixes
- Minor fixes
Security scan
TRUSTED
- Developer signature verified 2026-01-23
- Signature SHA1 66:99:C3:EC:0F:DE:6E:95:AC:0D:FF:A2:70:CB:B1:14:3D:62:A0:86
- File MD5 2d5ab32bd2dca1686931f2cd05b3d0d4
How to install Karl's Mortgage Calculator v3.11 on Android 4.4 KitKat+
Takes about 2 minutes. You'll need roughly 3.1 MB of free storage.
- Grab com.drcalculator.android.mortgage_74.apk — hit the Download button above (3.1 MB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches 2d5ab32bd2dca168…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find com.drcalculator.android.mortgage_74.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=Karl Jeacle, OU=Unknown, O=Unknown, L=Unknown, ST=Unknown, C=Unknown. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as TRUSTED).
- Done — open Karl's Mortgage Calculator — tap Open on the install screen, or find the Karl's Mortgage Calculator icon in your app drawer.
Common install errors for Karl's Mortgage Calculator
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android 4.4 KitKat or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.