How to Convert inches to millimeters
To convert inches to millimeters, multiply the value by 25.4.
The Formula
millimeters = inches × 25.4
Key Fact
1 inch = 25.4 millimeters
Tip: To convert millimeters back to inches, divide by 25.4.
Inches to MM
Convert inches (in) to millimeters (mm) with formulas, examples, and conversion tables.
in
mm
1 inches (in) = 25.4 millimeters (mm)
Round to:
cm + mm:2 cm 5.4 mm
Step-by-Step Solution
1Write the conversion factor:
1 inch = 25.4 millimeters
2Multiply the value by the conversion factor:
1 × 25.4 = 25.4
3Result:
1 inches (in) = 25.4 millimeters (mm)
inches to millimeters 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 |
| 25 in | 635 mm |
| 50 in | 1270 mm |
| 100 in | 2540 mm |
| 250 in | 6350 mm |
| 500 in | 12700 mm |
| 1000 in | 25400 mm |
1 inch in Other Units
| Unit | 1 in = |
|---|---|
| Inches to Kilometers | 2.54e-5 km |
| Inches to Meters | 0.0254 m |
| Inches to CM | 2.54 cm |
| Inches to MM | 25.4 mm |
| Inches to Micrometers | 25400 μm |
| Inches to Nanometers | 25400000 nm |
| Inches to Miles | 1.57828282828e-5 mi |
| Inches to Yards | 0.0277777777778 yd |
| Inches to Feet | 0.0833333333333 ft |
| Inches to Nautical Miles | 1.37149028078e-5 nmi |
| Inches to Fathoms | 0.0138888888889 ftm |
| Inches to Light Years | 2.68470563365e-18 ly |
| Inches to Astronomical Units | 1.69786096257e-13 AU |
| Inches to Parsecs | 8.23071937784e-19 pc |
| Inches to Angstroms | 254000000 Å |
| Inches to Planck Lengths | 1.57153419479e33 ℓP |
| Inches to Rods | 0.00505050505051 rd |
About Inches and Millimeters
What is a Inch?
The inch (in) is a unit of length in the imperial system. One inch equals 0.0254 meters.
What is a Millimeter?
The millimeter (mm) is a unit of length in the metric system. One millimeter equals 0.001 meters.