MM to CM Converter
Convert millimetres to centimetres instantly. Free online mm to cm calculator with common values and formula.
Formula
cm = mm ÷ 10
Common Conversions
How to Convert Millimetres to Centimetres
10 mm = 1 cm. Divide millimetres by 10 (or move the decimal point one place left) to get centimetres. So 250 mm = 25 cm. The cleanest possible metric conversion - just powers of ten.
Used when switching between fine-precision measurements (mm, common in engineering) and everyday measurements (cm, common in clothing and household). A 250 mm cake tin is a 25 cm tin - same thing, different scale of unit.
Common Millimetres to Centimetres Conversions
| Millimetres | Centimetres |
|---|---|
| 1 mm | 0.1 cm |
| 10 mm | 1 cm |
| 50 mm | 5 cm |
| 100 mm | 10 cm |
| 250 mm | 25 cm |
| 500 mm | 50 cm |
| 1000 mm (1 m) | 100 cm |
| 1500 mm | 150 cm |
Frequently Asked Questions
Why use mm vs cm?
mm for precision and small dimensions (electronics, fastener sizes, paper thickness). cm for everyday objects (paper sizes, clothing measurements, height in metric countries). Both are SI; pick the unit where typical values are whole numbers.
Are mm and cm interchangeable?
Mathematically yes (just a factor of 10). Conventionally, contexts pick one over the other for readability. A 'mm' precision measurement (3 mm) reads more naturally than '0.3 cm', though both are correct.
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