Unit Converter
Select a category and convert between common units. Every factor is exact — round-trip values return the input.
1 m = 3.28084 ft
How to use the unit converter
The converter handles the unit categories most people actually need: length, weight, volume, temperature, area, speed, and time. Pick a category first, then the two units, then the amount — the math runs instantly. Every conversion uses the exact factor (not a rounded decimal), so round-trips return the input.
- Pick a category from the tabs. The unit dropdowns reload to match the category you chose.
- Type the amount in the From field. Decimals and commas both work.
- Select the source unit (From) and the target unit (To). Use the swap button between them to flip the direction.
- Read the converted value on the right. It updates on every keystroke.
Temperature is different
Most units convert with a single multiplier — 1 km = 1000 m, always. Temperature doesn't, because Celsius and Fahrenheit use different zero points. 0°C = 32°F, not 0°F. The converter handles the offset correctly: °F = °C × 9/5 + 32, and Kelvin = °C + 273.15. Use the tool rather than trying to guesstimate a C↔F conversion in your head for anything beyond "roughly room temperature."
Common mix-ups
US and UK fluid ounces differ (≈29.57 mL vs. ≈28.41 mL). US and UK gallons differ more sharply — a UK gallon is about 20% bigger. Troy ounces (precious metals) are heavier than standard ounces. If a conversion looks off by a few percent, double-check which variant of the unit you selected.
Related tools — try a neighbour
Convert numbers between binary, octal, decimal, and hexadecimal — instantly and with strict validation.
Find your exact age in years, months, days, and hours — plus your next birthday countdown.
Calculate your Body Mass Index with imperial or metric units and see your WHO category.