Convert Millimeters to Centimeters
1 millimeter (mm) equals 0.1 centimeters (cm).
1 mm = 0.1 cm
Type in either box. Scientific notation works: 1.5e-3.
Converting a list? Use the bulk millimeter to centimeter converter to paste a column from Excel.
How to Convert Millimeter to Centimeter
- 1 mm = 0.1 cm
- 1 cm = 10 mm
- Example: convert 15 mm to cm: 15 mm = 15 × 0.1 cm = 1.5 cm
Formula
cm = mm ÷ 10
Derivation from SI units:
- 1 mm = 10⁻³ m
- 1 cm = 10⁻² m
- 1 mm = 0.001 m ÷ 0.01 m per cm = 0.1 cm
Both units are defined exactly, so the factor is exact. Millimeter definition: millimeter; Centimeter definition: centimeter.
Worked examples
- A 15 mm gap is 1.5 cm.
15 mm × 0.1 = 1.5 cm - 254 mm is 25.4 cm.
254 mm × 0.1 = 25.4 cm
Millimeter to Centimeter conversion table
| Millimeters (mm) | Centimeters (cm) |
|---|---|
| 0.1 mm | 0.01 cm |
| 0.5 mm | 0.05 cm |
| 1 mm | 0.1 cm |
| 2 mm | 0.2 cm |
| 3 mm | 0.3 cm |
| 5 mm | 0.5 cm |
| 6 mm | 0.6 cm |
| 8 mm | 0.8 cm |
| 10 mm | 1 cm |
| 12 mm | 1.2 cm |
| 15 mm | 1.5 cm |
| 16 mm | 1.6 cm |
| 20 mm | 2 cm |
| 25 mm | 2.5 cm |
| 25.4 mm | 2.54 cm |
| 30 mm | 3 cm |
| 50 mm | 5 cm |
| 75 mm | 7.5 cm |
| 100 mm | 10 cm |
| 150 mm | 15 cm |
| 300 mm | 30 cm |
| 500 mm | 50 cm |
| 1000 mm | 100 cm |
Where it's used
Drawings in millimetres are converted to centimetres for retail product sizes and everyday use. Divide by 10.
Millimeter to other length units
| Conversion | 1 mm equals |
|---|---|
| millimeter to meter | 0.001 m |
| millimeter to kilometer | 0.000001 km |
| millimeter to centimeter | 0.1 cm |
| millimeter to micrometer | 1000 µm |
| millimeter to nanometer | 1000000 nm |
| millimeter to angstrom | 10000000 Å |
| millimeter to mile | 6.213711922 × 10⁻⁷ mi |
| millimeter to yard | 0.001093613298 yd |
| millimeter to foot | 0.003280839895 ft |
| millimeter to inch | 0.03937007874 in |
| millimeter to mil | 39.37007874 mil |
| millimeter to nautical mile | 5.399568035 × 10⁻⁷ nmi |
Frequently asked questions
How many mm are in a cm?
Exactly 10.
How many centimeters are in 1 millimeter?
1 mm = 0.1 cm.
How do I convert millimeters to centimeters?
Multiply the value in mm by 0.1, or divide it by 10. For example, 15 mm × 0.1 = 1.5 cm.
Is the mm to cm conversion exact?
Yes. Both units are defined exactly, and 1 mm is exactly 0.1 cm.
Sources
- The International System of Units (SI), 9th edition (SI Brochure), Bureau International des Poids et Mesures , Table 7, SI prefixes.
Last reviewed: . Factors are stored exactly and computed with 50-digit decimal arithmetic. See how we verify conversion factors.
Cite this page
APA
Scientific Converters. (2026, October 15). Convert Millimeters to Centimeters. Retrieved October 17, 2026, from https://scientificconverters.com/length/millimeters-to-centimeters/
IEEE
Scientific Converters, "Convert Millimeters to Centimeters," scientificconverters.com. Accessed: Oct. 17, 2026. [Online]. Available: https://scientificconverters.com/length/millimeters-to-centimeters/