📏 Length converter
Millimeters to Inches Converter
Convert millimeters (mm) to inches (in) instantly. Includes formula, worked example, and a full reference chart from 1 to 1000 mm.
Millimeters
mm
Inches
in
How to convert millimeters to inches
One inch is exactly 25.4 millimeters, so to convert millimeters to inches divide by 25.4. This conversion is widely used in engineering, drilling, and woodworking.
Formula
inches = millimeters ÷ 25.4
Worked example
Convert 100 mm to in:
100 mm × 0.0393700787401574 → 3.937008 in
100 mm × 0.0393700787401574 → 3.937008 in
Common millimeters to inches values
Quick reference for common millimeter values:
- 1 mm = 0.0393701 in
- 5 mm = 0.19685 in
- 10 mm = 0.393701 in
- 100 mm = 3.937008 in
Millimeters to Inches conversion table
Full reference chart — useful for cooking, fitness, engineering, or homework.
| Millimeters | Inches |
|---|---|
| 1 mm | 0.0393701 in |
| 2 mm | 0.0787402 in |
| 3 mm | 0.11811 in |
| 5 mm | 0.19685 in |
| 10 mm | 0.393701 in |
| 20 mm | 0.787402 in |
| 25 mm | 0.984252 in |
| 50 mm | 1.968504 in |
| 75 mm | 2.952756 in |
| 100 mm | 3.937008 in |
| 250 mm | 9.84252 in |
| 500 mm | 19.685039 in |
| 1000 mm | 39.370079 in |
Inches to Millimeters table (reverse)
Looking the other way? Here's the reverse conversion:
| Inches | Millimeters |
|---|---|
| 1 in | 25.4 mm |
| 2 in | 50.8 mm |
| 3 in | 76.2 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 20 in | 508 mm |
| 25 in | 635 mm |
| 50 in | 1,270 mm |
| 75 in | 1,905 mm |
| 100 in | 2,540 mm |
| 250 in | 6,350 mm |
| 500 in | 12,700 mm |
| 1000 in | 25,400 mm |
Frequently asked questions
How many inches are in 1 millimeter?
There are 0.0393701 in in 1 mm.
How many inches are in 10 millimeters?
10 mm = 0.393701 in.
How many millimeters are in 1 inch?
1 in = 25.4 mm.
What is the formula to convert millimeters to inches?
The formula is inches = millimeters ÷ 25.4.