Calculator.io
176 calculators, offline
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Every calculator on calculator.io, now on your phone — 176 tools for math, money, health and dates. No sign-up, and they all work without a connection.
Calculator.io puts 176 calculators in your pocket — the same tools millions of people use on calculator.io every month, rebuilt as an app whose calculators work with no connection at all.
No account, no sign-up. Open a calculator and get an answer.
MATH — 61 tools
Fractions, percentages, ratios, exponents, roots, logarithms, quadratic equations, matrices, prime factors, GCF and LCM, scientific notation, rounding, long division and a full scientific calculator.
FINANCE — 41 tools
Mortgage payments and amortization schedules, loans, auto loans, refinance, APR, compound interest, savings, retirement and 401(k), salary and hourly pay, VAT and sales tax, tips, discounts, currency and unit conversions.
HEALTH & FITNESS — 21 tools
BMI, body fat, calories, TDEE and macros, ideal weight, BMR, pregnancy and due dates, ovulation, heart rate zones, pace and water intake.
TIME & DATE — 18 tools
Date difference, add or subtract days, age, business days, time duration, hours and minutes, time zones, countdowns, timers, alarms and a metronome.
STATISTICS — 15 tools
Mean, median and mode, standard deviation, variance, probability, permutations and combinations, confidence intervals, z-score, correlation and sample size.
MISCELLANEOUS — 20 tools
Unit and length conversions, fuel economy, concrete and paint estimates, tile and roofing, grades and GPA, dice, random numbers and more.
WHY IT FEELS DIFFERENT
Built for one hand. Every numeric field opens a keypad made for calculators, not the system keyboard: the keys you actually need, a field-to-field walk, and a Calculate button that is always where your thumb is.
Answers you can read. Results come with the numbers that matter — schedules, breakdowns and charts — not a single figure with no context.
Works offline. Every calculator, every formula and every page ships inside the app, so on a plane, in a basement or abroad with no data, it all still works.
28 languages. English, Spanish, Portuguese, French, German, Italian, Dutch, Polish, Russian, Ukrainian, Turkish, Arabic, Persian, Hindi, Bengali, Urdu, Indonesian, Malay, Thai, Vietnamese, Filipino, Japanese, Korean, Chinese, Swedish, Norwegian, Danish and Swahili — with full right-to-left layout where it belongs. The app follows your phone's language, or you can pick one yourself.
Save what you use. Bookmark the calculators you come back to; recents are one tap away on the home screen.
Light and dark, metric and imperial, and a layout that respects Dynamic Type.
Calculator.io is free. If a tool you need is missing, tell us — the list keeps growing.
Ratings & Reviews
- This app hasn’t received enough ratings or reviews to display an overview.
New Privacy Settings for ad choices where required. Minor fixes and improvements.
The developer, ARSIDIAN Limited Liability Company, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Location
- Identifiers
- Usage Data
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- ARSIDIAN Limited Liability Company
- Size
- 34.9 MB
- Category
- Utilities
- Compatibility
Requires iOS 17.0 or later.
- iPhone
Requires iOS 17.0 or later. - Mac
Requires macOS 14.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Advertising
Health or Wellness Topics
- Copyright
- © 2026 ARSIDIAN LLC