Table Of Contents
Inches to millimeters Conversion
1 inches (in) is equal to 25.4 millimeters (mm).
1 in = 25.4 mm
or
1 mm = 0.03937007874 in
Formula
To convert a length from inches (in) to millimeters (mm), multiply the length in inches by 25.4
l(mm) = l(in) × 25.4
Examples:
Convert 24 inches to millimeters:
l(mm) = 24in × 25.4 = 609.6 mm
Conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 6 in | 152.4 mm |
| 10 in | 254 mm |
| 12 in | 304.8 mm |
| 20 in | 508 mm |
| 24 in | 609.6 mm |
| 25 in | 635 mm |
| 36 in | 914.4 mm |
| 50 in | 1270 mm |
| 100 in | 2540 mm |
| 250 in | 6350 mm |
| 500 in | 12700 mm |
| Millimeters (mm) | Inches (in) |
|---|---|
| 1 mm | 0.039370079 in |
| 2 mm | 0.078740157 in |
| 3 mm | 0.118110236 in |
| 5 mm | 0.196850394 in |
| 6 mm | 0.236220472 in |
| 10 mm | 0.393700787 in |
| 12 mm | 0.472440945 in |
| 20 mm | 0.787401575 in |
| 24 mm | 0.94488189 in |
| 25 mm | 0.984251969 in |
| 36 mm | 1.417322835 in |
| 50 mm | 1.968503937 in |
| 100 mm | 3.937007874 in |
| 250 mm | 9.842519685 in |
| 500 mm | 19.68503937 in |
Frequently asked questions
How do I convert inches to millimeters?
Multiply the value in inches by 25.4 to get the result in millimeters. For example, 5 in × 25.4 = 127 mm.
How many millimeters are in 1 inches?
1 inches (in) is equal to 25.4 millimeters (mm).
How do I convert millimeters back to inches?
Use the inverse operation: divide the value in millimeters by 25.4 to get the result in inches.
How accurate is the inches to millimeters conversion?
The converter multiplies by the conversion factor 25.4 and rounds the result to 9 decimal places by default. You can increase or reduce the precision with the digits option on this page.
Sources
Conversion factors are based on internationally recognised standards:
