Inches to Millimeters Converter
Convert in to mm instantly — and see every other length unit at once.
From
To
25.4mm
1 in=25.4 mm
1 in in every unit
Millimeters
25.4mm
Centimeters
2.54cm
Meters
0.0254m
Kilometers
2.5400e-5km
Inchesfrom
1in
Feet
0.083333ft
Yards
0.027778yd
Miles
1.5783e-5mi
Nautical miles
1.3715e-5nmi
Common Inches to Millimeters conversions
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 5 in | 127 mm |
| 10 in | 254 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 |
The formula
mm = Inches × 25.4
Inches (in) — a unit of length.
Millimeters (mm) — a unit of length.
Worked examples
1 in→25.4 mm
Apply Inches × 25.4 with input = 1. Result: 25.4 mm.
5 in→127 mm
Apply Inches × 25.4 with input = 5. Result: 127 mm.
10 in→254 mm
Apply Inches × 25.4 with input = 10. Result: 254 mm.
FAQ
How do I convert Inches to Millimeters?
Use the formula: mm = Inches × 25.4. You can also use the converter above — type any value and the result updates instantly.
Where are Inches used?
Inches (in) — a unit of length.
Where are Millimeters used?
Millimeters (mm) — a unit of length.
How do I convert Millimeters back to Inches?
Use the Millimeters to Inches converter.