Inches to Millimeters
Convert inches (in) to millimeters (mm) instantly. See the formula, reference table, and common conversions.
Primary conversion
1 inch=25.399986millimeters
1 in = 25.399986 mm
Formula
millimeters = inches × 25.399986
Multiply the number of inches by 25.399986 to get the value in millimeters.
Reference Table
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 | 25.4 |
| 2 | 50.8 |
| 5 | 126.9999 |
| 10 | 253.9999 |
| 25 | 634.9997 |
| 50 | 1269.9993 |
| 100 | 2539.9986 |
| 250 | 6349.9966 |
| 500 | 12699.9931 |
| 1000 | 25399.9863 |
Frequently Asked Questions
How many millimeters are in 1 inch?
1 inch equals 25.399986 millimeters.
How do you convert inches to millimeters?
Multiply the number of inches by 25.399986 to get the value in millimeters. For example, 10 in = 253.9999 mm.
What is the formula for inches to millimeters?
millimeters = inches × 25.399986.
How do you convert millimeters back to inches?
Multiply millimeters by 0.03937 to get inches. 1 mm = 0.03937 in.