Convert Centimeters to Millimeters
Instantly convert Centimeters (cm) to Millimeters (mm) with our free online calculator.
Formula: cm to mm — multiply by 10
Reference Table
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 1 | 10 |
| 5 | 50 |
| 10 | 100 |
| 25 | 250 |
| 50 | 500 |
| 100 | 1000 |
How to Convert Centimeters to Millimeters
Formula
To convert Centimeters (cm) to Millimeters (mm): multiply by 10
Step-by-Step
- Start with your value in Centimeters (cm).
- Multiply by 10 to perform the conversion.
- The result is your value expressed in Millimeters (mm).
Conversion Factor
1 cm = 10 mm
Reverse Factor
1 mm = 0.1 cm
Worked Example
Convert 25 Centimeters to Millimeters: 25 cm = 250 mm
About Centimeter (cm)
A CGS-system metric unit of length equal to exactly 0.01 m = 10 mm (roughly the width of a standard pencil). The centimeter is the everyday metric-world working unit for human-scale objects: body measurements per WHO + IPMS (adult height 150-200 cm; waist 70-110 cm; shoulder width 35-50 cm; foot length 22-30 cm), clothing sizes per ISO 8559-1 + 8559-2 (chest 80-130 cm; bust 75-120 cm; hip 80-130 cm), household items and furniture (kitchen counter standard 85-90 cm height; dining table 75 cm; standard A4 paper 21.0 × 29.7 cm; ISO B5 17.6 × 25.0 cm), school rulers and stationery (typical 30 cm ruler), bicycle frame sizing (road bike 48-62 cm), and rainfall measurement (1 cm of rain = 10 mm = 10 L/m² volume per unit area). Centimeters bridge the gap between millimeters (too small for human-scale) and meters (too large for body/furniture). Used universally in Europe, Asia, Australia, and Latin America for everyday body + product measurements, with the United States as the major exception. Convert cm to inches by dividing by 2.54; to mm by multiplying by 10.
About Millimeter (mm)
A metric unit of length equal to exactly 0.001 m = 10⁻³ m (about the thickness of a credit card or 1/16 of an inch). The millimeter is the default unit in mechanical engineering drawings worldwide per ISO 128 (technical drawing) + ISO 286 (GD&T tolerances): tight machining tolerances are typically ±0.01 to ±0.10 mm; press-fit interference fits ±0.025 mm class IT6; semiconductor wafer flatness < 0.001 mm = 1 μm. mm is also the working unit for: rainfall measurement per WMO (1 mm rain = 1 L/m² per AMS Glossary; heavy rainfall warning ≥ 25 mm/24h in most jurisdictions); camera lens focal lengths (typical full-frame 24-70 mm zoom; portrait 85 mm; telephoto 200-600 mm; macro 100 mm); bullet calibers outside the US (9 mm Parabellum, 7.62 mm AK-47 + NATO, 5.56 mm M16); tire sidewall heights and rim widths (e.g., 225/45R17 means 225 mm wide × 45% aspect-ratio sidewall × 17-inch rim diameter); precision machining + 3D printing layer heights (typical FDM 0.1-0.3 mm; SLA 0.025-0.1 mm); and lumber and architectural-millwork specs in DIN-standard markets. Convert mm to inches by dividing by 25.4; to cm by dividing by 10.
Quick Facts
- 1 Centimeter equals 10 Millimeters
- 1 Millimeter equals 0.1 Centimeters
- Centimeter is a unit of length & distance
- Millimeter is a unit of length & distance
- This conversion is commonly used in construction, navigation, athletics, and everyday measurement
- The Centimeter belongs to the metric system
Common Centimeter to Millimeter Conversions
| Centimeters (cm) | Millimeters (mm) |
|---|---|
| 0.1 | 1 |
| 0.5 | 5 |
| 1 | 10 |
| 2 | 20 |
| 3 | 30 |
| 4 | 40 |
| 5 | 50 |
| 10 | 100 |
| 15 | 150 |
| 20 | 200 |
| 25 | 250 |
| 30 | 300 |
| 40 | 400 |
| 50 | 500 |
| 75 | 750 |
| 100 | 1000 |
| 150 | 1500 |
| 200 | 2000 |
| 250 | 2500 |
| 500 | 5000 |
| 1000 | 10000 |
Understanding Centimeters
The Centimeter (symbol: cm) is a unit of length & distance. A CGS-system metric unit of length equal to exactly 0.01 m = 10 mm (roughly the width of a standard pencil). The centimeter is the everyday metric-world working unit for human-scale objects: body measurements per WHO + IPMS (adult height 150-200 cm; waist 70-110 cm; shoulder width 35-50 cm; foot length 22-30 cm), clothing sizes per ISO 8559-1 + 8559-2 (chest 80-130 cm; bust 75-120 cm; hip 80-130 cm), household items and furniture (kitchen counter standard 85-90 cm height; dining table 75 cm; standard A4 paper 21.0 × 29.7 cm; ISO B5 17.6 × 25.0 cm), school rulers and stationery (typical 30 cm ruler), bicycle frame sizing (road bike 48-62 cm), and rainfall measurement (1 cm of rain = 10 mm = 10 L/m² volume per unit area). Centimeters bridge the gap between millimeters (too small for human-scale) and meters (too large for body/furniture). Used universally in Europe, Asia, Australia, and Latin America for everyday body + product measurements, with the United States as the major exception. Convert cm to inches by dividing by 2.54; to mm by multiplying by 10.
It belongs to the metric measurement system.
Centimeters are commonly used in construction, navigation, athletics, and everyday measurement.
Understanding Millimeters
The Millimeter (symbol: mm) is a unit of length & distance. A metric unit of length equal to exactly 0.001 m = 10⁻³ m (about the thickness of a credit card or 1/16 of an inch). The millimeter is the default unit in mechanical engineering drawings worldwide per ISO 128 (technical drawing) + ISO 286 (GD&T tolerances): tight machining tolerances are typically ±0.01 to ±0.10 mm; press-fit interference fits ±0.025 mm class IT6; semiconductor wafer flatness < 0.001 mm = 1 μm. mm is also the working unit for: rainfall measurement per WMO (1 mm rain = 1 L/m² per AMS Glossary; heavy rainfall warning ≥ 25 mm/24h in most jurisdictions); camera lens focal lengths (typical full-frame 24-70 mm zoom; portrait 85 mm; telephoto 200-600 mm; macro 100 mm); bullet calibers outside the US (9 mm Parabellum, 7.62 mm AK-47 + NATO, 5.56 mm M16); tire sidewall heights and rim widths (e.g., 225/45R17 means 225 mm wide × 45% aspect-ratio sidewall × 17-inch rim diameter); precision machining + 3D printing layer heights (typical FDM 0.1-0.3 mm; SLA 0.025-0.1 mm); and lumber and architectural-millwork specs in DIN-standard markets. Convert mm to inches by dividing by 25.4; to cm by dividing by 10.
It belongs to the metric measurement system.
Millimeters are commonly used in construction, navigation, athletics, and everyday measurement.
Why Convert Centimeters to Millimeters?
Whether you are travelling internationally, working on a construction project, or studying science, converting between Centimeters and Millimeters is a task you will encounter regularly. Builders and architects often work with specifications that mix metric and imperial units, while athletes and coaches may need to compare race distances reported in different systems. Having an accurate, instant conversion tool removes guesswork and reduces measurement errors that can be costly in professional settings.
Frequently Asked Questions
How do I convert Centimeters to Millimeters?
A CGS-system metric unit of length equal to exactly 0. To convert Centimeters to Millimeters, multiply by 10. For example, 25 cm equals 250 mm.
How many Millimeters are in 1 Centimeter?
There are 10 Millimeters in 1 Centimeter.
How many Centimeters are in 1 Millimeter?
There are 0.1 Centimeters in 1 Millimeter.
What is the formula for Centimeter to Millimeter conversion?
The formula is: multiply by 10. This means 1 cm = 10 mm.
Is a Centimeter bigger than a Millimeter?
No. One Centimeter is smaller than one Millimeter because 1 cm equals 10 mm, which is greater than 1.
When do you need to convert between Centimeters and Millimeters?
A metric unit of length equal to exactly 0. Centimeter and Millimeter are both length units, so conversion comes up whenever one source of information uses one unit and another uses the other — a classic cross-reference challenge in engineering, trade, travel, and everyday life.