BigInt Calculator4.5 - App Store

A calculator for those who need more than standard precision.

Integers of any size stay exact - no overflow, no lost digits. Fractions and square roots are shown to 10, 50, 100 or 1000 decimal places, as you choose. Multiplying numbers thousands of digits long takes milliseconds, and independent parts of an expression are computed in parallel on all CPU cores.

Features
- Addition, subtraction, multiplication, division
- Powers and square roots (0.5, 1.5, 2.5...)
- Parentheses and correct operator precedence
- mod with fast modular powers: 3^(2^127-2) mod (2^127-1) takes an instant
- Factorial (!) and the functions gcd, lcm, binom, isprime and nextprime
- Hexadecimal and binary: integer results in hex, numbers like 0xff and 0b101
- Scientific notation (6.022e23) and superscript powers (2¹²⁷)
- Three independent tabs M1, M2, M3 for parallel work
- Keyboard bar with ( ) - √ ! on iPhone and iPad
- Your tabs are saved between launches; Undo after clearing
- History of recent calculations
- A result screen with as many digits as fit, the digit count and the order of magnitude; ≈ marks results that are not exact
- Every digit of a huge result in numbered rows, with a jump to any digit
- Live progress and elapsed time for long calculations, with a Cancel button
- Copy the result with one tap and the expression from the menu; share a result as text, a file or an image card
- VoiceOver support; on Mac, menu commands and keyboard shortcuts
- Built-in help with examples
- Alternative symbol support: x ÷ : and a comma as decimal separator

How it works
Type a power with ^: 2^127-1. An exponent of 0.5 is a square root: 2^0.5. Parentheses work as in mathematics: (2+3)*4. mod has the lowest precedence: 2^255-19 mod 8. Function arguments are separated by a semicolon: gcd(12; 18). On iPhone, functions and 0x numbers are typed on a hardware keyboard or pasted.

Who it's for
- Students and math teachers
- Developers working with cryptography and large primes
- Number theory researchers
- Anyone hitting the limits of ordinary calculators

No ads, no trackers, no accounts. Works on smartphone, tablet, and computer.

Version History Version 4.5
- A new result screen: as many digits as fit, the digit count and the order of magnitude
- See every digit of a huge result, jump to any digit, share it as text, a file or an image card
- mod with fast modular powers, factorial (!), gcd, lcm, binom, isprime and nextprime
- Hexadecimal and binary numbers; choose 10, 50, 100 or 1000 decimal places
- Scientific notation (6.022e23) and superscript powers (2¹²⁷)
- History of recent calculations
- Digits in easy-to-read groups; ≈ marks results that are not exact
- Long calculations show their progress and can be canceled
- Keyboard bar keys insert at the cursor, plus a new ! key
- Better VoiceOver support
- On Mac: Edit and View menu commands with keyboard shortcuts
- Help with examples of what the calculator understands 4.5 Sep 19 You can now rate BigInt right from inside the app. Your reviews help us become better. 4.2 May 18 Added localization for most languages. 4.1 Apr 9 App was renamed 4.0 Mar 6 Version 3.0 brings a major performance and UX update:

Implemented GPU computation with Metal shaders for core arithmetic operations, so large expressions calculate faster.
Added a progress bar with completion percentage for long calculations.
Added calculation time display after completion.
Improved result accuracy and calculation stability for complex expressions and very large numbers.
Optimized exponentiation and removed some previous limitations.
Added Mac support.
Added copy buttons for both expression and result.
Improved expression input and handling of math symbols.
Minor UI improvements and technical fixes. 3.0 Feb 23 Fixed small UI bugs 2.5.1 10/24/2024 Added the ability to calculate the exponent of a number 2.5.0 08/13/2024 Formula reader support has been extended, the camera can now scan:
- symbols "*", "×", "•" for multiplication
- symbols ":", "÷", "/" for division 2.4.1 03/03/2023 - Double tap to copy the result or expression into the clipboard 2.4 02/27/2023 Improved interaction with memory tabs 2.3 02/18/2023 - Implemented multiple tabs support 2.2 02/07/2023 Entering numbers in the form of a chat has been implemented, which allows you to focus even better on the text and make fewer mistakes 2.1 02/03/2023 - Fixed a bug that crashed the application when entering two commas in one number
- The result is shown in monospaced text for better readability 2.0.1 01/29/2023 - Сode base has been migrated to SwiftUI
- Introduced new convenient and powerful UX-design 2.0 01/27/2023 1.0 02/20/2022