Unit Converter

Every measurement shows up in a different unit depending on where you live and which industry you work in. Recipes use cups and ounces, science uses milliliters and grams, US road signs use miles, the rest of the world uses kilometers. Converting by hand means looking up a constant (or doing mental math that usually drifts by a few percent) and writing the answer with the right precision.

This converter covers the categories that show up in everyday work: length (mm to miles), mass (mg to stones), temperature (Celsius / Fahrenheit / Kelvin), volume (ml to gallons), time (ms to weeks), and digital storage (bytes to terabytes, binary). Pick a category, type a number, switch the units — the result updates live. The two unit selectors can be swapped with the arrow button when you want to convert in the opposite direction.

Conversions are exact for length, mass, volume, time, and storage (they all reduce to a single base-unit multiplier). Temperature is the exception: the math is affine, not proportional, so Celsius to Fahrenheit involves both a scale shift and a multiplier. The tool handles that automatically.