HexCalculator
The hex calculator that lives in your pocket
HexCalculator is a free calculator for iPhone and iPad built for programmers, engineers and students. Work in hexadecimal, decimal or binary, run bitwise operations, and keep every calculation in a history you can scroll back through.
Requires iOS 16.0 or later · ~3.6 MB · No ads · No data collection
Everything a programmer's calculator should do
Hex, decimal & binary
Calculate in the base you think in. Add, subtract, multiply and divide hexadecimal, decimal or binary numbers, and read the result in all three bases.
Bitwise operations
AND, OR, XOR and bit shifts (<<, >>) built in — the operations you actually reach for when working with flags, masks and registers.
Signed & unsigned, 64-bit
Flip between signed and unsigned interpretation. Negative numbers use two's complement, and overflow and division by zero are caught instead of silently wrong.
Persistent history
Every operation is saved with its decimal, hex and binary form. Scroll back, check a previous result, clear it when you're done.
Smart copy & paste
Paste 0xFF, FF, 0b1010, values with underscores or spaces — the parser understands the formats code actually uses.
Private and light
Around 3.6 MB, works offline, shows no ads and collects no data — the App Store privacy label is “Data Not Collected”.
Designed for one-handed, real-world use
The app also includes a customizable style — pick your own colors for the keypad, operators and display — and a unified display view that shows decimal, hex and binary at the same time.
Free hex tools, right here in your browser
No sign-up, no ads — the same math the app does, on the web.
Hex calculator
Arithmetic and bitwise operations on hexadecimal numbers, 64-bit signed or unsigned.
Hex ↔ decimal converter
Convert both ways with the positional breakdown worked out step by step.
Hex ↔ binary converter
See exactly how each hex digit maps to four bits.
Binary ↔ decimal converter
Powers of two, spelled out for any number you type.
Two's complement calculator
8, 16, 32 or 64 bits, from hex, decimal or binary input.
Guides
Learn the method behind the tools: conversions, two's complement and bitwise ops.
Frequently asked questions
Is HexCalculator free?
Yes — HexCalculator is a free download on the App Store, with no ads.
Which devices does it support?
iPhone and iPad running iOS 16.0 / iPadOS 16.0 or later, in portrait and landscape.
Does it work offline?
Yes. The app performs all calculations on your device and needs no internet connection.
Does it collect any data?
No. The developer does not collect any data from the app — its App Store privacy label is “Data Not Collected”.
How are negative numbers handled?
In signed mode the app uses 64-bit two's complement, the same representation CPUs use. You can switch to unsigned mode at any time. Our two's complement guide explains how it works.