Calculator

A clean, fast and fully offline calculator. Scientific mode, unit converter, everyday tools and a date calculator in one small app.

Android · Free · No ads

Download APK Source code on GitHub

Screenshots

Unit converter showing length units — Unit converter

Days between two dates — Days between dates

Features

Calculator

Live result preview while you type
Scientific mode: sin, cos, tan, ln, log, √, x², xʸ, 1/x, π and e, in degrees or radians
Turns scientific when you rotate your phone
History saved on your device; tap an entry to reuse it
Long-press the display to copy, paste or share; swipe it to delete the last digit

Unit converter

11 categories with live results for every unit at once: length, weight, temperature, area, volume, speed, time, data, fuel economy, pressure and energy.

Everyday tools

Discount and tax: sale price, savings, VAT, GST or sales tax
Tip and split: the tip and each person's share
Percentage: X% of Y, X as a percent of Y, percent change
Loan and EMI: monthly payment, total interest and total paid
BMI: metric or imperial, with the healthy range for your height

Date calculator

Days between two dates, in years, months, weeks and days
Exact age from a date of birth, the weekday you were born and days until your next birthday

Make it yours

Light, dark or system theme with 6 accent colors
Number formats for every region: 1,234.56 1.234,56 1 234,56 12,34,567.89
Choose how many decimal places to show
Key vibration on or off

Private by design

Calculator works completely offline. It has no ads, no analytics and no accounts, and it never collects or sends your data. The only network request happens when you tap "Check for updates".

Install

Open the latest release on GitHub.
Download Calculator-vX.Y.Z.apk and open it on your phone.
If asked, allow installing apps from your browser or file manager.

Already installed? Open the menu and tap Check for updates.

App details

Platform	Android
Current version	1.3.0
Price	Free, no ads, no in-app purchases
Internet	Not needed, only for the optional update check
License	MIT
Source code	github.com/lumio-apps/calculator
Report a problem	GitHub Issues