Unit Converter 单位换算

Convert length, weight, temperature, area, volume and more between units. 长度、重量、温度、面积、体积等多类单位互转换算。

单位换算

Two-way auto conversion 输入数值双向自动换算
换算分类
m
cm厘米
换算结果

Unit Converter Guide

This tool supports conversion among five common categories: length, weight, temperature, area, and volume. The source and target values are linked bidirectionally — modifying either side instantly converts the other. All calculations run locally in your browser.

Conversion Principle

For proportional units (length, weight, area, volume), the source value is first converted to the base unit of that category, then from the base unit to the target unit.

Target = Source × Source factor ÷ Target factor

Temperature involves a zero-point offset, so it must first be converted to Celsius and then to the target unit:

°F = °C × 9/5 + 32
K = °C + 273.15

Base Units by Category

  • Length: base unit meter (m), includes mm, cm, m, km, in, ft, mi.
  • Weight: base unit gram (g), includes mg, g, kg, t, oz, lb.
  • Temperature: Celsius as intermediary, includes °C, °F, K.
  • Area: base unit square meter (m²), includes cm², m², ha, km², ft², acre.
  • Volume: base unit liter (L), includes mL, L, m³, gal, ft³.

FAQ

Is the gallon US or imperial?
This tool uses the US liquid gallon (1 gal ≈ 3.785 L). The imperial gallon is about 4.546 L; convert manually if needed.
Why do temperature results have minor decimal deviations?
Temperature conversion involves a zero-point offset (e.g., 32°F corresponds to 0°C) rather than pure proportion, so results may have repeating decimals. This tool keeps up to 10 decimal places.
Is the tonne a metric ton or a US ton?
The tonne here is a metric ton (1 t = 1000 kg), different from the US short ton (about 907 kg).

Note: Conversion factors use international standard values; results are for reference only.

单位换算说明

本工具支持长度、重量、温度、面积、体积五类常用单位互转。源值与目标值双向联动,修改任一侧都会即时换算另一侧。所有计算在浏览器本地完成。

换算原理

对于比例型单位(长度、重量、面积、体积),先以该类的基准单位为中介:将源值换算为基准单位,再由基准单位换算为目标单位。

目标值 = 源值 × 源单位换算系数 ÷ 目标单位换算系数

温度因存在零点偏移,需先换算为摄氏度再换算为目标单位:

°F = °C × 9/5 + 32
K = °C + 273.15

各类基准单位

  • 长度:基准为米(m),含毫米、厘米、米、千米、英寸、英尺、英里。
  • 重量:基准为克(g),含毫克、克、千克、吨、盎司、磅。
  • 温度:以摄氏度为中介,含摄氏、华氏、开尔文。
  • 面积:基准为平方米(m²),含平方厘米、平方米、公顷、平方千米、平方英尺、英亩。
  • 体积:基准为升(L),含毫升、升、立方米、加仑、立方英尺。

常见问题

加仑是美制还是英制?
本工具采用美制液体加仑(1 gal ≈ 3.785 L)。英制加仑约 4.546 L,如需英制请按比例自行换算。
温度换算结果为什么有小数偏差?
温度换算包含零点偏移(如华氏 32° 对应摄氏 0°),并非纯比例运算,结果可能带有循环节,本工具保留至多 10 位小数。
吨是公吨还是美吨?
本工具的吨为公吨(1 t = 1000 kg),与美国短吨(约 907 kg)不同。

说明:换算系数取国际标准值,结果仅供参考。