Unit Converter Master Guide

The Unit Converter covers seven categories with a live conversion table that updates as you type. Here is how to get the most out of it, category by category — including the traps that trip people up.

Length and area

Length converts between metric and imperial plus nautical and survey units. Area behaves the same but remember the square: 1 metre is 3.28 feet, but 1 square metre is 10.76 square feet. Convert the linear unit, square the factor.

Mass

Kilograms, pounds, ounces, stones and more. Cooking note: recipes from the US use volume, not mass — see volume below. The one trap is mixing tonnes (metric, 1000 kg) with tons (imperial, ~1016 kg). The tool keeps them separate.

Temperature — the only nonlinear one

Temperature conversion is the trap category. You cannot use a simple factor: 20°C is 68°F, but 40°C is 104°F, not 136°F. The formulas are °F = °C × 9/5 + 32 and °C = (°F − 32) × 5/9. The tool applies them exactly.

Volume, speed and data

Volume: litres, millilitres, gallons (US vs imperial differ by ~20%!), cups and fluid ounces.
Speed: km/h, mph, knots, m/s — knots matter for marine and aviation contexts.
Data: bytes, KB, MB, GB using binary (1024) multiples — what storage and bandwidth actually use.

The US gallon and the imperial gallon are different units. If a recipe or spec does not say which, that 20% difference is worth confirming.

Which gallon is used here?

Both. The converter lists "US gallon" and "Imperial gallon" as separate units so you always pick the right one.

Why does my 1 GB drive show as 0.93 GiB?

Storage is sold in decimal gigabytes (1,000,000,000 bytes) while operating systems often display binary gibibytes (1,073,741,824 bytes). The data section converts both.

Tools used in this article