About this calculator
From metres to feet, kilograms to pounds, or Celsius to Fahrenheit, everyday conversions come up constantly. This converter covers the four most common categories — length, weight, temperature and volume — with an instant, accurate result as you type.
How it works
For length, weight and volume, each unit has a fixed ratio to a base unit, so the value is converted to the base and then to your target unit. Temperature is different — it uses the exact Celsius, Fahrenheit and Kelvin formulas rather than a simple ratio.
Frequently asked questions
Which units are supported?
Length (mm to miles), weight (mg to tonnes), volume (ml to gallons) and temperature (°C, °F, K).
Are the gallons US or imperial?
Volume uses US measures (cups, pints, gallons). Values differ slightly from imperial gallons.
How is temperature converted?
With the exact formulas — for example °F = °C × 9/5 + 32 — not an approximation.
Is it accurate enough for recipes and DIY?
Yes, it uses precise conversion factors, so it is reliable for cooking, travel and home projects.