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Unit Converter
Convert length, weight, temperature, area, volume, speed and data size instantly.
This tool runs entirely in your browser. Nothing is uploaded to any server.
Length
What is this
什么是单位换算
公制、英制、市制在不同领域各自为政——出差看英里、买菜论斤、硬盘标 GB。本工具七类常用单位即输即换，无需记忆系数。
What is a unit converter
Metric, imperial and traditional units coexist — miles on the road, 斤 at the market, GB on the box. Type a number and get all seven categories converted instantly.
如何使用
- 选择类别（长度/重量/温度/面积/体积/速度/数据）。
- 输入数值并选择源单位，其余单位实时给出。
- 点击结果复制。
FAQ
Why is temperature special?
Temperature needs offset formulas, not just multiplication (0°C ≠ 0). Correct math is built in.
GB vs GiB?
Yes — GB is decimal (1e9, vendor convention), GiB is binary (2^30, OS convention). Both are available.
Is the precision professional-grade?
IEEE 754 double precision with standard factors is fine for everyday engineering; for metrology-certified work, defer to calibrated instruments.