---
title: "Unit converter — every unit, with the maths shown"
description: "Convert between every unit of length, weight, volume, area, temperature, speed, energy, power, pressure, data and time. Full tables, exact formulas and a calculator on every page."
url: https://atoneplace.net/convert/
site: "At One Place"
---

# Unit converter

Every unit on the site converts to every other unit in its dimension. Each page shows the exact formula rather than just the answer, because knowing that an inch is exactly 25.4 millimetres by definition is more useful than being handed a decimal.

## Most looked up

- [cm to inches](https://atoneplace.net/convert/cm-to-inches/)
- [inches to cm](https://atoneplace.net/convert/inches-to-cm/)
- [kg to lbs](https://atoneplace.net/convert/kg-to-lbs/)
- [lbs to kg](https://atoneplace.net/convert/lbs-to-kg/)
- [celsius to fahrenheit](https://atoneplace.net/convert/celsius-to-fahrenheit/)
- [fahrenheit to celsius](https://atoneplace.net/convert/fahrenheit-to-celsius/)
- [km to miles](https://atoneplace.net/convert/km-to-miles/)
- [miles to km](https://atoneplace.net/convert/miles-to-km/)
- [feet to meters](https://atoneplace.net/convert/feet-to-meters/)
- [meters to feet](https://atoneplace.net/convert/meters-to-feet/)
- [liters to gallons](https://atoneplace.net/convert/liters-to-gallons/)
- [gallons to liters](https://atoneplace.net/convert/gallons-to-liters/)
- [tablespoons to teaspoons](https://atoneplace.net/convert/tablespoons-to-teaspoons/)
- [cups to ml](https://atoneplace.net/convert/cups-to-ml/)
- [oz to grams](https://atoneplace.net/convert/oz-to-grams/)
- [stone to lbs](https://atoneplace.net/convert/stone-to-lbs/)

## By measurement

- [Length](https://atoneplace.net/convert/length/) — 16 units
- [Weight and mass](https://atoneplace.net/convert/mass/) — 12 units
- [Volume](https://atoneplace.net/convert/volume/) — 16 units
- [Area](https://atoneplace.net/convert/area/) — 9 units
- [Time](https://atoneplace.net/convert/time/) — 11 units
- [Speed](https://atoneplace.net/convert/speed/) — 7 units
- [Temperature](https://atoneplace.net/convert/temperature/) — 4 units
- [Energy](https://atoneplace.net/convert/energy/) — 8 units
- [Power](https://atoneplace.net/convert/power/) — 6 units
- [Pressure](https://atoneplace.net/convert/pressure/) — 8 units
- [Digital storage](https://atoneplace.net/convert/data/) — 13 units
- [Money](https://atoneplace.net/convert/money/) — 1 units
- [Count](https://atoneplace.net/convert/count/) — 1 units
- [Sound](https://atoneplace.net/convert/sound/) — 2 units
- [Frequency](https://atoneplace.net/convert/frequency/) — 5 units
- [Angle](https://atoneplace.net/convert/angle/) — 6 units

## Sources

- Guide for the Use of the International System of Units (SP 811) — NIST (https://www.nist.gov/pml/special-publication-811) [Public domain (US Government)]
- The International System of Units (SI Brochure) — Bureau International des Poids et Mesures (https://www.bipm.org/en/publications/si-brochure)