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A Free Unit Converter for Everyday and Technical Use

UnitFlip converts between the units people actually need day-to-day: length (meters, feet, inches, miles, km), weight (kg, lb, oz, stone), temperature (Celsius, Fahrenheit, Kelvin), volume (liters, gallons, cups, ml), area (square meters, acres, hectares), and speed (km/h, mph, knots, m/s). Instead of memorizing conversion factors or doing manual arithmetic, type a value once and see it converted across every common unit in that category simultaneously, with results updating live as you type.

Why Conversions Are Precise

Unit conversions seem simple but small rounding errors compound in technical fields like cooking, construction, engineering, and shipping. UnitFlip uses standardized, internationally recognized conversion factors (e.g. exactly 2.54 cm per inch, exactly 0.45359237 kg per pound) rather than rounded approximations, so the output is accurate enough for professional use, not just rough estimates. Temperature conversions correctly apply the different offset formulas for Celsius, Fahrenheit, and Kelvin rather than treating them as simple multiplication.

免费在线单位换算器

UnitFlip 是一款免费的在线单位换算工具，支持长度、重量、温度、体积、面积和速度等常用单位之间的即时换算，输入数值即可同时看到所有常见单位的换算结果，无需注册，无需安装，全部在浏览器本地完成计算。

Frequently Asked Questions

Which unit categories does this converter support?▼
UnitFlip currently covers length, weight/mass, temperature, volume, area, and speed — the categories people convert most often for cooking, travel, fitness, shipping, and everyday calculations. Within each category, every common unit (metric and imperial) is converted at once so you can compare them side by side.
How accurate are the conversions?▼
UnitFlip uses exact, internationally standardized conversion factors (for example, 1 inch = exactly 2.54 cm, 1 pound = exactly 0.45359237 kg) rather than rounded approximations, so results are precise to several decimal places — accurate enough for cooking, DIY projects, fitness tracking, and most professional use cases.
Does this tool work offline or send my data anywhere?▼
All conversions happen instantly in your browser using JavaScript — nothing is sent to a server. You can use it without an account, and once the page has loaded, the math keeps working even without an internet connection.
How does the "Swap" button work?▼
Swap instantly flips your "from" and "to" units, so if you just converted miles to kilometers and now want to go the other direction, one click reverses the comparison without retyping anything.
Why does temperature conversion work differently from the others?▼
Unlike length or weight, temperature scales don't share a common zero point, so converting between Celsius, Fahrenheit, and Kelvin requires an offset formula rather than a simple multiplication factor (e.g. °F = °C × 9/5 + 32). UnitFlip applies the correct formula for each pair automatically.