UNIT CONVERT
Unit convert, rates at a glance.
Convert between common units of length, mass, area and time, with rate notes to aid memorization.
1 千米 = 1000 米，1 米 = 10 分米 = 100 厘米 = 1000 毫米
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What is this?
Pick a category and units, enter a value to convert; the rate note below helps you memorize the relationships.
示例与注意事项Example & notes
一个例子A worked example
孩子作业里遇到「3 千米 50 米等于多少米」：先统一成米再相加，得到 3050 米；长度、重量、面积、时间都可这样换算。A homework question asks how many metres 3 km 50 m is: unify the units first, add, and you get 3,050 m. Length, weight, area and time all work this way.
注意事项Things to watch
- 复名数（3 千米 50 米）要先统一单位再计算，直接写 350 是最常见的漏零错误。Mixed units (3 km 50 m) must be unified first — writing 350 is the classic dropped-zero mistake.
- 面积单位是平方进率：1 平方米 = 10000 平方厘米，不是 100。Area units square the factor: 1 m² = 10,000 cm², not 100.
- 时间单位混用 60 进制与 100 进制（1 分 = 60 秒、1 秒 = 1000 毫秒），最容易出错。Time mixes base-60 and base-1000 steps (1 min = 60 s, 1 s = 1000 ms), where mistakes cluster.
相关问答More Q&A
为什么面积进率是 10000？Why is the area factor 10,000?
因为 1 米 = 100 厘米，平方之后进率就是 100² = 10000，体积则是 100³ = 1000000。Because 1 m = 100 cm, so the factor squares to 100² = 10,000; volume cubes it to 1,000,000.
能出题给孩子练吗？Can it generate practice questions?
可以，到「小学单位换算练习」页按长度、重量、面积、时间分类刷题并自动判分。Yes — the practice page drills length, weight, area and time with automatic marking.