Centimeters to Millimeters (cm → mm) – Formula, Quick Values, Examples & FAQ
Convert centimeters to millimeters. 1 centimeter equals 10 millimeters, so just multiply by 10 (add one zero). Below: formula, quick values, step example, uses, tips, table, FAQ.
1. Core Idea
Metric scale: mm → cm → m. Each step is ×10 or ÷10. Thus mm = cm × 10 and cm = mm ÷ 10.
2. Formula
mm = cm × 10 | cm = mm ÷ 10
3. Quick Values
1 cm = 10 mm
2 cm = 20 mm
5 cm = 50 mm
7.5 cm = 75 mm
10 cm = 100 mm
12 cm = 120 mm
15 cm = 150 mm
25 cm = 250 mm
30 cm = 300 mm
50 cm = 500 mm
4. Step‑by‑Step Example
Convert 18.4 cm to millimeters
- Formula: mm = cm × 10
- Insert value: mm = 18.4 × 10
- Compute: 18.4 × 10 = 184
Answer: 18.4 cm = 184 mm
5. Practical Uses
- Precision machining / tolerance notes
- 3D printing & CAD model dimension refinement
- School science experiments (graduated rulers)
- Medical device sizing (catheters, tubing, etc.)
6. Accuracy & Tips
- No rounding needed—factor 10 is exact.
- Decimal shift: move decimal one place right (e.g., 6.2 cm → 62 mm).
- Reverse check: obtained mm ÷ 10 should return the original cm.
- For sub‑millimeter precision use mm plus decimals, not cm fractions.
7. More Examples Table
| cm | mm |
|---|
| 3.2 | 32 |
| 6.0 | 60 |
| 8.75 | 87.5 |
| 14 | 140 |
| 22.5 | 225 |
| 37 | 370 |
8. FAQ
- Is 1 cm always 10 mm? Yes—exact by definition.
- How many mm in 2.35 cm? 2.35 × 10 = 23.5 mm.
- Why switch to mm? Avoid fractions; mm gives finer granularity.
- Need micrometers? Multiply mm by 1000 (1 mm = 1000 µm).