Search for a command to run...
Convert length, mass, temperature, area, volume and speed with bidirectional inputs.
Runs locally in your browser by default — nothing is uploaded first.
You can type on either side and the other side updates instantly.
Edit either side, switch units, or swap directions instantly.
Unit Converter runs locally in your browser by default, so you can work with the content without uploading it first.
Convert common units for length, mass, temperature, area, volume and speed with two-way inputs.
Does Unit Converter run locally or in the cloud?
Unit Converter runs locally in your browser by default, so you can work with the content without uploading it first.
What usually comes after Unit Converter?
A common next step is to continue into related workflows such as Everyday Calculator Tools.
Is an inch exactly 2.54 cm?
Yes. It has been defined as exactly 25.4 mm since 1959, so the conversion carries no rounding error.
An inch is exactly 25.4 mm and a pound is exactly 0.45359237 kg. Which conversions are exact, which are not, and why temperature and fuel economy behave differently.
Percentage Change: The Formula and Four Ways It MisleadsHow to compute percent change correctly, why percent and percentage points are different, and why a 50% drop needs a 100% rise to recover.
Exchange Rates for Pricing: Spot, Mid-market and the Spread You Actually PayThe rate on a news site is not the rate on an invoice. How mid-market, bid and ask differ, and how to avoid silent margin errors.
collectionEveryday Calculator ToolsConvert common units for length, mass, temperature, area, volume and speed with two-way inputs.
