Length converter
Type a length and pick its unit. You'll see it in every other unit at once: millimeters, centimeters, meters, inches, feet and yards.
To
10 cm=3.93701 in≈ 3 15/16 in
The same length in every unit
The exact numbers behind it
Since 1959 the inch has been defined as exactly 25.4 millimeters, so every conversion here is exact rather than rounded:
- 1 inch = 2.54 cm = 25.4 mm
- 1 foot = 12 inches = 30.48 cm
- 1 yard = 3 feet = 91.44 cm
- 1 meter = 100 cm ≈ 39.37 inches ≈ 3.28 feet
Inch fractions in millimeters
Drill bits, wrenches and tape measures often use fractions of an inch. Here they are in decimals and millimeters:
| Fraction | Decimal | Millimeters |
|---|---|---|
| 1/16 in | 0.0625 in | 1.59 mm |
| 1/8 in | 0.125 in | 3.18 mm |
| 3/16 in | 0.1875 in | 4.76 mm |
| 1/4 in | 0.25 in | 6.35 mm |
| 5/16 in | 0.3125 in | 7.94 mm |
| 3/8 in | 0.375 in | 9.53 mm |
| 1/2 in | 0.5 in | 12.7 mm |
| 5/8 in | 0.625 in | 15.88 mm |
| 3/4 in | 0.75 in | 19.05 mm |
| 7/8 in | 0.875 in | 22.23 mm |
| 1 in | 1 in | 25.4 mm |
Quick mental conversions
- Inches to cm: multiply by 2.5, then add a little. 10 inches is about 25 cm (exactly 25.4).
- Cm to inches: multiply by 4, then divide by 10. 30 cm is about 12 inches (exactly 11.81).
- Feet to meters: divide by 3, then take off a tenth. 6 ft is about 1.8 m (exactly 1.83).
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