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Custom Colors

Accent

#d4943a

Background

#0c0e11

Header

#141719

Cards

#1a1d21

Accessibility Presets

Font

Code and tool outputs stay monospace.

Readability

Font Size

16px

Line Height

1.6

Letter Spacing

0px

Numbers & Math

Unit converters, base converters, calculators, and math utilities.

148 tools available

The Numbers & Math tools turn awkward arithmetic into instant, exact answers — unit conversions, number-base changes, percentages, ratios, statistics, and everyday calculators. Behind a simple input box sits careful handling of the things people get wrong by hand: floating-point rounding, significant figures, and the long chains of conversion factors that link metric and imperial systems.

Conversions here are dimensionally consistent: each unit is defined against an SI base, so miles → metres → feet resolves through a single source of truth rather than a hard-coded shortcut that drifts. Base converters move freely between decimal, binary, octal, and hexadecimal, and the calculators show their working so you can trust — and learn from — the result. Everything computes client-side and updates live as you type, which makes these tools as useful for checking homework as for sizing an engineering tolerance.

3D Geometry / Vector Lab Calculator

Adding Fractions Calculator Calculator

Addition Calculator Calculator

Antilog Calculator Calculator

Arccos Calculator Calculator

Arcsin Calculator Calculator

Arctan Calculator Calculator

Area Calculator Calculator

Average Calculator Calculator

Bandwidth Calculator Calculator

Base Converter Converter

Basic Calculator Calculator

Big Number / Arbitrary Precision Calculator Calculator

Binary / ASCII / Hex / Base64 Converter Converter

Binary Calculator Calculator

Bra Size Calculator Calculator

Braille Converter Converter

Calculus Workbench Calculator

Capstan Winch Calculator Calculator

Circle Calculator Calculator

Coin Flip Generator

Common Factor Calculator Calculator

Complex Numbers Calculator Calculator

Computational Geometry Toolkit Calculator

Confidence Interval Calculator Calculator

Convolution Calculator Calculator

Cosine Calculator Calculator

Data Regression Tool Calculator

Date Calculator Calculator

Day Counter Tool

Day of the Week Calculator Calculator

Density Calculator Calculator

Dew Point Calculator Calculator

Dice Roller Tool

Differential Equation Solver Calculator

Distance Calculator Calculator

Dividing Fractions Calculator Calculator

Division Calculator Calculator

Engine Horsepower Calculator Calculator

Euler's Method Calculator (+ Formula & e) Calculator

Exponent Calculator Calculator

Exponential Growth Calculator Calculator

Exponents Calculator Calculator

Factor Calculator Calculator

Factorial Calculator Calculator

File Size Converter Converter

Formats Converter Converter

Fourier / Signal Math Lab Calculator

Fourier Epicycle Drawer Tool

Fractal Explorer (Mandelbrot & Julia) Tool

Fraction Calculator Calculator

Fuel Cost Calculator Calculator

Gas Mileage Calculator Calculator

GDP Calculator Calculator

Golf Handicap Calculator Calculator

Graph Algorithm Laboratory Calculator

Graphing Calculator Calculator

Greatest Common Factor Calculator Calculator

Half-Life Calculator Calculator

Heat Index Calculator Calculator

Height Calculator Calculator

Hex Calculator Calculator

Horsepower Calculator Calculator

Hours Calculator Calculator

Intel HEX → BIN Converter Converter

IP Subnet Calculator Calculator

LCM Calculator Calculator

Linear Algebra Lab Calculator

Natural Log (ln) Calculator Calculator

Log Calculator Calculator

Long Division Calculator Calculator

Love Calculator Calculator

Mass Calculator Calculator

Matrix Calculator Calculator

Mean, Median, Mode, Range Calculator Calculator

Mileage Calculator Calculator

Molarity Calculator Calculator

Molecular Weight Calculator Calculator

Morse Code Converter Converter

Multiplication Calculator Calculator

Multiplying Fractions Calculator Calculator

Number Base Converter Converter

Number Formatter Formatter

Number Sequence Calculator Calculator

Numerical Methods Lab Calculator

Online Math Calculator Calculator

Optimization Solver Calculator

P-Value Calculator Calculator

Password Generator Generator

Percent Error Calculator Calculator

Percentage Calculator Calculator

Percentage Change Calculator Calculator

Percentage Increase Calculator Calculator

Permutation and Combination Calculator Calculator

Prime Factorization Calculator Calculator

Probability & Statistics Lab Calculator

Probability Calculator Calculator

Pythagorean Theorem Calculator Calculator

Quadratic Formula Calculator Calculator

Random Number Generator Generator

Random Number Generator Generator

Ratio Calculator Calculator

Remainder Calculator Calculator

Resistor Calculator Calculator

Right Triangle Calculator Calculator

Roman Numeral Converter Converter

Roman Numeral Converter Converter

Root Calculator Calculator

Rounding Calculator Calculator

Sample Size Calculator Calculator

Scientific Calculator Calculator

Scientific Notation Converter Converter

Scientific Notation Calculator Calculator

Shoe Size Conversion Tool

Simple Math Calculator Calculator

Simplifying Fractions Calculator Calculator

Sine Calculator Calculator

Sleep Calculator Calculator

Slope Calculator Calculator

Speed Calculator Calculator

Square Root Calculator Calculator

Standard Deviation Calculator Calculator

Statistics Calculator Calculator

Subtracting Fractions Calculator Calculator

Subtraction Calculator Calculator

Surface Area Calculator Calculator

Symbolic Algebra Engine Calculator

Tangent Calculator Calculator

Temperature Converter Converter

Text Case Converter Converter

Time Calculator Calculator

Time Card Calculator Calculator

Time Duration Calculator Calculator

Time Formats Converter Converter

Time Zone Calculator Calculator

Tire Size Calculator Calculator

Triangle Calculator Calculator

Trigonometry Calculator Calculator

Unit Converter Converter

Variance Calculator Calculator

Volume Calculator Calculator

Weight Calculator Calculator

Weighted Average Calculator Calculator

Wheel Spinner / Random Picker Generator

Wind Chill Calculator Calculator

Z-Score Calculator Calculator

Chaos Theory Lab Visualizer

Math Inspector Analyzer

SI prefixes & orders of magnitude

The metric prefixes underpinning most unit conversions, from the very small to the very large.

Prefix	Symbol	Factor	Power of 10
Giga	`G`	1,000,000,000	10⁹
Mega	`M`	1,000,000	10⁶
Kilo	`k`	1,000	10³
(base)	—	1	10⁰
Milli	`m`	0.001	10⁻³
Micro	`µ`	0.000001	10⁻⁶
Nano	`n`	0.000000001	10⁻⁹

Converting within the metric system is just shifting the decimal point by the difference in powers of ten.

Text & Encoding

Encoders, decoders, hashing, formatters, and string tools.

Image, audio, video tools and file inspection utilities.

Ohm's law, resistor codes, LED calculators, and circuit tools.

A universal color converter, pickers, palette generators, contrast checkers, and gradient builders.

JSON/XML formatters, URL tools, regex testers, and HTTP utilities.

Learn to program from zero to advanced — pick a language and your level, then step through code, run it live, and work through guided lessons.