Math & number tools
Number bases, binary maths, primes and constants. Browse 18 free tools below.
- Seconds to Time ConverterConvert seconds to H:M:S or human time, and back.Math
- Roman Numeral ConverterConvert numbers to Roman numerals and back.Math
- Scientific Notation ConverterSwitch between decimal and scientific notation.Math
- Number Base ConverterConvert numbers between any two bases from 2 to 36.Math
- Binary ConverterConvert binary to decimal, octal and hex.Math
- Decimal ConverterConvert decimal to binary, octal and hex.Math
- Hex ConverterConvert hexadecimal to binary, octal and decimal.Math
- Octal ConverterConvert octal to binary, decimal and hex.Math
- BCD ConverterConvert decimal, hex and octal to binary coded decimal and back.Math
- Gray Code ConverterConvert binary, decimal, octal and hex to Gray code and back.Math
- Binary CalculatorAdd, multiply and apply AND, OR, XOR, NAND, NOR, XNOR and NOT.Math
- Binary Bit ToolsInvert, reverse and rotate the bits of a binary number.Math
- Words to Numbers ConverterTurn English number words into digits.Math
- Number Rounding ToolRound numbers up, down or to the nearest value.Math
- Prime Number GeneratorList the first N primes or all primes up to a limit.Math
- Fibonacci Number GeneratorGenerate the Fibonacci sequence with very large numbers.Math
- Pi Digit GeneratorCalculate digits of pi to high precision.Math
- Euler's Number Digit GeneratorCalculate digits of e to high precision.Math
About math & number tools
Number bases, binary maths, primes and constants. This collection has 18 free tools, including Seconds to Time Converter, Roman Numeral Converter, Scientific Notation Converter, Number Base Converter, Binary Converter and more. Number bases, binary logic and sequences come up in programming, electronics and maths classes. A general calculator rarely handles them well.
These tools work with exact whole numbers of any size and explain errors clearly, so you can trust the answer and see what went wrong when an input is invalid.
Math & number tools FAQ
What are math & number tools?
Number bases, binary maths, primes and constants. Every tool in this collection is free and needs no sign-up.
How many math & number tools are available?
There are 18 tools in this collection today, and new ones are added regularly.
Are these tools free?
Yes. They are free with no limits, watermarks or accounts.
Is my data private?
Yes. All calculations run in your browser and nothing is sent anywhere.
Do the tools work on mobile?
Yes. Every tool is responsive and works in modern mobile and desktop browsers.
What can I use math & number tools for?
Computer science and electronics homework; Converting numbers while debugging code; Exploring sequences and constants; Quick checks without opening a calculator.