How to use Unit converter
- 1
Choose a category
Tap Length, Temperature, Volume, Data, Cooking or another category at the top.
- 2
Pick the units
Open each unit menu and search by name or symbol, or use the swap button to flip the direction.
- 3
Type a value
Enter the number on either side; read the result, the reverse factor and the full table of every unit below.
Limits and Pro
Free and unlimited: 15 categories with 160+ units, 25 cooking ingredients, values from −10^300 to 10^300 and 3 to 12 significant digits of precision.
About Unit converter
Convert between more than 160 units in fifteen categories: length, weight and mass, temperature, volume, area, speed, time, digital data, pressure, energy, power, fuel economy, angles, frequency and a cooking converter for cups, spoons and grams. Pick a category, type a value on either side and the other side updates instantly; the swap button flips the direction, and the unit menus are searchable, so typing "psi", "tbsp" or "light" finds the unit without scrolling.
Every conversion uses the exact legal definition where one exists — an inch is exactly 2.54 cm, a pound exactly 0.45359237 kg, a US gallon exactly 3.785411784 litres — and the result line shows both directions plus the factor or formula used, such as °F = °C × 9/5 + 32 or 235.215 ÷ MPG for litres per 100 km. A precision setting from 3 to 12 significant digits controls rounding, and very large or small numbers switch to scientific notation. Below the converter, a table lists your value in every unit of the category, and a list of common conversions loads popular pairs with one tap.
Volume keeps US, UK and metric measures apart, because a UK pint is 20 fluid ounces and a US pint only 16. Data sizes separate SI units (1 GB = 1,000,000,000 bytes) from the binary IEC units operating systems often use (1 GiB = 1,073,741,824 bytes). The cooking converter turns cups and spoons into grams for 25 common ingredients using typical densities; those are averages, so for baking a kitchen scale is still the most accurate tool.
Privacy
Conversions are computed entirely in your browser from built-in tables; the values you enter never leave your device. The chosen category, units and value are kept in the page link so you can bookmark or share a conversion.
Features
Searchable units
Find any unit by name, symbol or alias in a keyboard-friendly list.
Every unit at once
Your value converted into each unit of the category.
Cups to grams
Ingredient-aware cooking conversions for flour, sugar, butter and more.