Millimetres to Centimetres
Millimetres to Centimetres (mm to cm) Converter
Convert from
- Centimetrescm
- Inchesin
- Metresm
- Kilometreskm
- Millimetresmm
- Micrometresµm
- Nanometresnm
- Feetft
- Yardsyd
- Milesmi
- Nautical milesnmi
- Milsmil
- US survey feetft (US survey)
- Astronomical unitsau
- Light-yearsly
- ÅngströmsÅ
1 millimetre = 0.1 centimetres
Default is 5 significant figures. “Units typed as” decides what words like gallon, pint or cup mean when you type them. Scientific input such as 1e15 or 2.5e-3 works in the value box; type unit names or a whole conversion in the unit picker’s search.
- 1 mm = 0.1 cm
- 5 mm = 0.5 cm
- 10 mm = 1 cm
- 25 mm = 2.5 cm
Shortcuts: / value box · S swap · Esc close the picker · Alt+C copy · Alt+L link · Alt+F favourite
How it’s calculated
10 mm make 1 cm, so move the decimal point one place to the left: 25 mm = 2.5 cm.
1 mm = 0.1 cm (exact) · 1 cm = 10 mm (exact)
cm = mm × 0.1
- Multiply the value in millimetres by 0.1.
- To go back, divide by 0.1 (or multiply by 10).
- 1 mm = 0.1 cm · 1 cm = 10 mm
Step by step
Find the conversion factor
By definition 1 mm = 0.001 m and 1 cm = 0.01 m, so 1 cm = 10 mm. Source: BIPM SI Brochure (9th ed.).
Multiply by the factor written as a fraction
Put mm in the denominator so it cancels, leaving cm.
Calculate (unrounded)
Round the answer
Rounded to 5 significant figures.
Answer: 0.1 cm
Formula: cm = mm × 0.1. Factors last reviewed 2026-10-27.
Millimetres to centimetres conversion table
1 millimetre = 0.1 centimetres · 1 cm = 10 mm
- 1 millimetre = 0.1 centimetres
- 5 millimetres = 0.5 centimetres
- 10 millimetres = 1 centimetres
- 25 millimetres = 2.5 centimetres
- 100 millimetres = 10 centimetres
| Millimetres (mm) | Centimetres (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 |
| 4 mm | 0.4 cm |
| 5 mm | 0.5 cm |
| 6 mm | 0.6 cm |
| 7 mm | 0.7 cm |
| 8 mm | 0.8 cm |
| 9 mm | 0.9 cm |
| 10 mm | 1 cm |
| 15 mm | 1.5 cm |
| 20 mm | 2 cm |
| 25 mm | 2.5 cm |
| 30 mm | 3 cm |
| 40 mm | 4 cm |
| 50 mm | 5 cm |
| 75 mm | 7.5 cm |
| 100 mm | 10 cm |
| 250 mm | 25 cm |
| 500 mm | 50 cm |
| 1,000 mm | 100 cm |
FAQ
How do I convert millimetres to centimetres?
Use cm = mm × 0.1. Multiply the value in millimetres by 0.1.
How many centimetres are in 1 millimetre?
1 millimetre (mm) equals 0.1 centimetres (cm).
How many millimetres are in 1 centimetre?
1 centimetre (cm) equals 10 millimetres (mm).
What is 10 mm in cm?
10 millimetres = 1 centimetres.
What is a millimetre?
Defined as exactly 1/1,000 of a metre.
What is a centimetre?
Defined as exactly 1/100 of a metre.
About these units
Millimetre (mm)
SI (metric)
1 mm = 0.001 m (exact)
Defined as exactly 1/1,000 of a metre.
Source: BIPM SI Brochure (9th ed.)
Centimetre (cm)
SI (metric)
1 cm = 0.01 m (exact)
Defined as exactly 1/100 of a metre.
Source: BIPM SI Brochure (9th ed.)