Common units first
The tool focuses on units that often appear in engineering and documentation: m, km, cm, inch, ft, kg, g, lb, oz, C, F, and K.
Unit Converter
브라우저 내부 처리
Convert common length, weight, and temperature units quickly.
Unit conversion checklist
Unit conversion is not hard arithmetic; the difficulty is which standard applies. Gallons differ between the US and UK, tons come in three kinds, and temperature is an offset rather than a ratio. Converting length, weight and temperature in one place makes it easy to re-check the basis when a number looks wrong.
Two-way conversion
Switch From and To values or use the swap button to check the same quantity in the opposite direction.
Immediate calculation
Calculations run in the browser, so you can avoid jumping to a separate calculator or search result.
Errors you will hit
Why temperature behaves differently
Length and weight are pure scaling, but temperature scales have different zero points and need an offset. 0°C is 32°F, not 0°F. Converting a temperature difference is also not the same as converting a temperature.
Too many decimal places for a document
The result shows the raw computed value. Round to the precision you need and settle the unit notation before publishing.
Things to check
Rounding policy
The tool shows the calculated value directly. For reports or UI text, round to the precision your audience expects.
Temperature has offsets
Temperature conversion is not a simple ratio. Always keep the unit label when mixing Celsius, Fahrenheit, and Kelvin.
Rounding separates similar units
Traditional area units often get rounded in listings, and the gap becomes visible at larger sizes. When checking a contract, work from the official square-metre figure rather than the rounded local unit.
Temperature is an offset, not a ratio
Celsius and Fahrenheit have different zero points, so a plain multiplication is wrong. "Twice 20 degrees" is not 40 degrees. When converting a temperature difference, apply only the ratio and drop the offset.
Same unit name, different value
A gallon differs between the US and the UK (about 3.79 L versus 4.55 L), and tons split into metric, short and long. When transferring figures from foreign documents, confirm which standard is meant.
More: step-by-step usage and worked examples
How to use it
- Select length, weight, or temperature.
- Enter the value and choose the source and target units.
- Review the result and use swap when you need the reverse conversion.
- When pasting into docs, decide the rounding and include the unit label.
Real input and output
Length
Input
100 kmOutput
62.1371 mile
328,084 ft
100,000 mTemperature
Input
25 °COutput
77 °F
298.15 KTools that pair well
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