Live results as you type
Every calculator updates instantly while you enter values — no submit button, no waiting. See answers the moment you change an input.
Free · Offline-first · Android
Calcitra: the all-in-one calculator app with 4,000+ free calculators
One free calculator app for finance, health, math and unit conversion — live results as you type, even with no internet.
Calcitra
All-in-one calculator
4,000+
Calculators & converters
8+
Categories
100%
Offline-first
Free
No sign-up needed
Why Calcitra
One calculator app instead of dozens
Calcitra replaces a folder full of single-purpose tools with one fast, free calculator app. Whether you need a loan EMI calculator, a BMI calculator, a percentage tool or a unit converter, every answer lives in one clean, searchable place — and works offline.
Features
Built to be fast, accurate and effortless
Thoughtful details that make everyday calculations quicker, from instant results to region-aware formatting.
Works fully offline
Calcitra is offline-first, so your free calculator app keeps working on a plane, underground or anywhere with no internet required.
Favourites & history
Pin the calculators you use most and revisit recent results from your history, so the tools you need are always one tap away.
Region-aware
Automatic local currency, measurement units and date formats. Switch regions any time to match how you live and work.
Dark mode & Material 3
A clean, modern Material 3 interface with light and dark themes that is comfortable on the eyes day or night.
Clear explanations
Each tool includes original, plain-language guidance and the standard formula it uses, so you understand the result, not just the number.
Calculator categories
What calculators and converters are included?
Calcitra spans more than 4,000 calculators and converters across the categories below — covering finance, health, math, unit conversion, physics and construction.
Finance
Plan money decisions with a loan EMI calculator, mortgage, investment, interest and tax tools that handle real-world repayment schedules.
Health & fitness
Track wellbeing with a BMI calculator plus BMR, daily calorie and body-fat estimators to support your fitness goals.
Math
From a quick percentage calculator to algebra, geometry and statistics, solve everyday and study-time math in seconds.
Unit conversion
A complete unit converter for length, mass, volume, temperature, area, speed and data — plus a live currency converter.
Physics
Work through force, motion, energy and other physics calculations with clearly labelled inputs and standard formulas.
Construction
Estimate materials and dimensions with construction tools for concrete, paint, flooring, area and more on the job site.
Real use cases
A single app for everyday calculations
Calcitra is designed for the moments when you need a trustworthy answer fast — at home, at work or on the move.
Budgeting a big purchase
Compare loan and EMI options or run a mortgage scenario before you commit, with clear monthly figures and total interest.
Staying on top of health
Check your BMI, estimate daily calories and track body-fat trends using widely accepted health formulas.
Converting on the go
Switch between metric and imperial units or convert currency while travelling — cached rates keep working offline.
Homework and study
Solve percentage, algebra, geometry and statistics problems and learn the method behind each result with built-in explanations.
Calcitra Pro
Go further with Calcitra Pro
Calcitra is free forever. Upgrade to Pro for a distraction-free, power-user experience that syncs across your devices.
- Remove adsEnjoy a clean, ad-free calculator experience.
- Unlimited historyKeep every calculation, not just recent ones.
- Export to PDF & CSVShare or archive results in seconds.
- Custom calculatorsBuild and save your own formulas and tools.
- Cloud syncFavourites, history and custom calcs on every device.
- Premium themesPersonalise Calcitra with extra colour themes.
Start free, upgrade whenever you are ready — no commitment required.
FAQ
Frequently asked questions
Everything you need to know about the Calcitra all-in-one calculator app.
Is there one app with all calculators (mortgage, BMI, percentage, tip)?
Yes. Calcitra is one all-in-one calculator app that bundles 4,000+ calculators and converters in a single place, including mortgage and loan EMI, BMI, percentage and tip, plus thousands more across finance, health, math and unit conversion.
Does the Calcitra calculator app work offline with no internet required?
Calcitra is offline-first, so nearly every calculator and unit converter works with no internet required. Only live currency rates need an occasional connection to refresh; once cached, conversions keep working offline too.
Is the Calcitra calculator app free?
Yes, Calcitra is a free calculator app supported by ads. An optional Calcitra Pro subscription removes ads and unlocks unlimited history, PDF and CSV export, custom calculators, cloud sync and premium themes.
What calculators and converters are included in Calcitra?
Calcitra includes finance tools such as loan EMI, mortgage, investment, interest and tax; health calculators like BMI, BMR, calorie and body fat; math calculators for percentage, algebra, geometry and statistics; plus a full unit converter and currency converter, physics and construction tools.
Does Calcitra support my local currency, units and date format?
Yes. Calcitra is region-aware, so it automatically applies your local currency, measurement units and date format. You can switch regions in settings to suit how you work.
Which devices does the Calcitra calculator app support?
Calcitra is available for Android phones and tablets from the Google Play Store. It features a clean Material 3 interface with light and dark mode that adapts to screens of all sizes.
Get 4,000+ calculators in one free app
Download Calcitra and carry an all-in-one calculator, unit converter and currency converter in your pocket — online or off.