Length Converter
Convert meters, centimeters, feet, inches, kilometers, miles and more in one view.
Length
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Common Benchmarks
Standard door height
80 in
Soccer goal width
24 ft
Marathon
26.2 mi
Mount Everest
8,849 m
Olympic pool
50 m
School bus
35 ft
Formula
mm = in × 25.4
Example
Example: convert 20 inches to millimeters.
20 in = 508 mm
Conversion table
| inches (in) | millimeters (mm) |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 20 in | 508 mm |
| 50 in | 1270 mm |
| 100 in | 2540 mm |
Explanation
Inches are commonly used in the United States for screens and small lengths, while Millimeters are used for very small lengths and engineering tolerances.
How to convert inches to millimeters
- Start with the value in inches (in).
- Multiply it by 25.4.
- The result is the measurement in millimeters (mm).
Example: 20 in → 508 mm
Frequently Asked Questions
How much is 20 inches in millimeters?
20 inches equals 508 millimeters.
How to convert inches to millimeters?
To convert inches to millimeters, multiply by 25.4.
How many millimeters is 1 inch?
1 inch equals 25.4 millimeters.
How many inches is 1 millimeter?
1 millimeter equals 0.03937007874 inches.
What is the difference between inches and millimeters?
Both are units of length. The main difference is usually scale and common usage context.
Where are inches and millimeters used?
They are used to measure length in everyday and technical contexts. The most common unit depends on the field and measurement needs.