Unit Converter
Convert length, weight, temperature, volume, data and more, instantly.
About this tool
Miles to kilometers, pounds to kilos, Fahrenheit to Celsius, gallons to liters, gigabytes to gibibytes: this converter handles eight families of units — length, weight, temperature, volume, area, speed, digital storage and energy — and converts both ways as you type. Edit either box and the other one updates immediately.
Conversion factors are the exact legal definitions (1 mile = 1,609.344 m, 1 pound = 0.45359237 kg), and results are rounded sensibly, so you never see 0.30000000000004 on screen. Open the “all units at once” table to see your value in every unit of the family. Everything runs in your browser — no upload, no sign-up.
Frequently asked questions
How do I convert Celsius to Fahrenheit?
Multiply by 9/5 and add 32: 100 °C × 1.8 + 32 = 212 °F. Temperature is the one case with no simple multiplier, because the scales start at different points — which is why −40 °C and −40 °F are the same temperature.
What is the difference between MB and MiB?
A megabyte (MB) is 1,000,000 bytes; a mebibyte (MiB) is 1,048,576. That is why a “1 TB” drive shows up as roughly 931 GiB in your file manager: the manufacturer counts in powers of ten, the operating system in powers of two. Both are available here.
Is a US gallon the same as a UK gallon?
No. A US gallon is 3.785 L, an imperial (UK) gallon is 4.546 L — a 20 % difference. Both are listed separately so fuel economy and recipe conversions stay correct.
How accurate are the results?
Factors follow the SI and the international yard-and-pound agreement exactly. Display is rounded to seven significant digits for readability, while the underlying calculation keeps full precision.
Is it really free, with no sign-up?
Yes — the tool is free, needs no account and has no usage limit. Processing happens locally in your browser, so your data never leaves your device.