Unit Converter
Convert length, weight, temperature and more — instantly and precisely, right as you type.
How it works
Pick a category, choose your units, and type a value — the answer appears instantly.
This converter handles eight everyday categories: length, mass & weight, temperature, area, volume, speed, digital storage and time. Most units convert through a single precise base factor (for example, everything in length routes through metres), so results stay accurate even across very large or very small values.
Temperature is special. Celsius, Fahrenheit and Kelvin don't share a common zero point, so a simple ratio
would give the wrong answer. We use the proper offset formulas instead — for example
°F = °C × 9/5 + 32 and K = °C + 273.15 — so 0 °C correctly becomes 32 °F,
not 0.
Everything runs locally in your browser with plain JavaScript. Nothing you type is uploaded or stored, there's no sign-up, and it works offline once the page has loaded.