Web Tools
Unit Converter
Convert between common measurement units across 7 categories: length, weight, temperature, volume, speed, area, and time. Supports metric and imperial systems. Runs entirely in your browser — your data never leaves your machine.
unit converter metric imperial length weight temperature
Published May 30, 2026
All interactive tools run entirely in your browser. Your data never leaves your device.
How It Works
Select a category, enter a value, choose the source unit, and see instant conversions to all other units in that category. Supports both metric and imperial systems with precise conversion factors.
Categories
- Length: mm, cm, m, km, inches, feet, yards, miles
- Weight: mg, g, kg, metric tons, ounces, pounds, stone
- Temperature: Celsius, Fahrenheit, Kelvin
- Volume: mL, L, cubic meters, teaspoons, tablespoons, fluid ounces, cups, pints, gallons
- Speed: m/s, km/h, mph, knots, ft/s
- Area: mm/cm/m/km squared, hectares, sq inches, sq feet, acres
- Time: milliseconds, seconds, minutes, hours, days, weeks, months, years
Features
- 7 categories: comprehensive unit conversion across common measurement systems
- Convert to all: see results for every unit in the selected category at once
- Precise conversions: uses standard conversion factors
- Negative values: handles negative temperatures and other negative values correctly
- 5 examples: miles to km, Fahrenheit to Celsius, gallons to liters, mph to km/h, acres to m2
- Private: runs entirely in the browser — no data transmitted
Use Cases
- Quick unit conversions during development
- Converting API responses between unit systems
- International measurement system comparisons
- Scientific and engineering calculations
- Recipe and cooking conversions