Convert centimeters (cm) to millimeters (mm) or vice versa in seconds. Ideal for measuring small objects (e.g., paper thickness) — no complex math, just instant, precise results.
Convert cm to mm in 1 step — no complex formulas! Perfect for daily tasks like measuring craft supplies, electronic parts, or paper thickness. Learn the simple metric system relationship and never mix up small lengths again.
cm and mm are both metric length units (base unit: meter), and their relationship is simple: 1 centimeter (cm) = 10 millimeters (mm) This is a fixed decimal relationship (no approximations) — easy to remember and calculate.
L(mm) = L(cm) × 10
1. Convert 5 cm (pencil length) to mm:
L(mm) = 5 cm × 10 = 50 mm
2. Convert 12.5 cm (smartphone width) to mm:
L(mm) = 12.5 cm × 10 = 125 mm
For reverse conversion (mm to cm), use: L(cm) = L(mm) ÷ 10 (e.g., 80 mm = 80 ÷ 10 = 8 cm).
See how cm and mm relate to other common length units — perfect for cross-unit reference.
Metric unit (mid-size)
1 cm = 10 mm
1 cm = 0.01 m (meter)
1 cm ≈ 0.3937 inch
Use: Book size, phone width, height
Metric unit (small-size)
1 mm = 0.1 cm
1 mm = 0.001 m (meter)
1 mm ≈ 0.03937 inch
Use: Paper thickness, screw size, hair width
Base metric unit
1 m = 100 cm = 1000 mm
1 m ≈ 3.28084 ft (foot)
1 m ≈ 1.09361 yd (yard)
Use: Room length, person height, distance
Imperial unit
1 inch ≈ 2.54 cm = 25.4 mm
1 inch = 0.0254 m (meter)
1 inch = 1/12 ft (foot)
Use: Screen size, tool measurements (US)
Quick reference for common centimeter values to millimeters — with real-life examples for clarity.
| Centimeters (cm) | Millimeters (mm) | Calculation (cm to mm) | Real-Life Example |
|---|---|---|---|
| 0.5 cm | 5 mm | 0.5 × 10 = 5 | Thick paper (2 sheets) |
| 1 cm | 10 mm | 1 × 10 = 10 | Pencil lead diameter (thick) |
| 3 cm | 30 mm | 3 × 10 = 30 | Eraser width |
| 5 cm | 50 mm | 5 × 10 = 50 | Standard pencil length (short) |
| 10 cm | 100 mm | 10 × 10 = 100 | Smartphone height (small) |
| 15 cm | 150 mm | 15 × 10 = 150 | Book width (paperback) |
| 20 cm | 200 mm | 20 × 10 = 200 | Laptop thickness (with case) |
| 50 cm | 500 mm | 50 × 10 = 500 | Tablet screen diagonal |
Answers to common questions about converting centimeters to millimeters for daily and professional use.
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