MM to Inches Converter
Type a value in millimeters to see it in inches as you type, with the exact formula and a reference chart.
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- Nearest fraction
- 31/32 in
How this was calculated
- 1 inch = 25.4 millimeters
- 25 ÷ 25.4 = 0.98425197 in
| mm | in | fraction |
|---|---|---|
| 1 mm | 0.0393701 in | 1/32 |
| 2 mm | 0.0787402 in | 3/32 |
| 3 mm | 0.11811 in | 1/8 |
| 4 mm | 0.15748 in | 5/32 |
| 5 mm | 0.19685 in | 3/16 |
| 6 mm | 0.23622 in | 1/4 |
| 8 mm | 0.314961 in | 5/16 |
| 10 mm | 0.393701 in | 13/32 |
| 12 mm | 0.472441 in | 15/32 |
| 15 mm | 0.590551 in | 19/32 |
| 16 mm | 0.629921 in | 5/8 |
| 20 mm | 0.787402 in | 25/32 |
| 25 mm | 0.984252 in | 31/32 |
| 30 mm | 1.1811 in | 1 3/16 |
| 40 mm | 1.5748 in | 1 9/16 |
| 50 mm | 1.9685 in | 1 15/16 |
| 60 mm | 2.3622 in | 2 3/8 |
| 70 mm | 2.75591 in | 2 3/4 |
| 80 mm | 3.14961 in | 3 1/8 |
| 100 mm | 3.93701 in | 3 15/16 |
| in | mm |
|---|---|
| 0.125 in | 3.175 mm |
| 0.25 in | 6.35 mm |
| 0.375 in | 9.525 mm |
| 0.5 in | 12.7 mm |
| 0.625 in | 15.875 mm |
| 0.75 in | 19.05 mm |
| 1 in | 25.4 mm |
| 1.25 in | 31.75 mm |
| 1.5 in | 38.1 mm |
| 2 in | 50.8 mm |
| 2.5 in | 63.5 mm |
| 3 in | 76.2 mm |
How to convert millimeters to inches
1 millimeter = 0.0393700787 inches. To convert millimeters to inches, divide by 25.4 (or multiply by 0.0393700787). A millimeter is one thousandth of a meter. The international inch is exactly 2.54 cm (agreed in 1959).
Worked examples
- 10 millimeters = 0.393701 in (10 ÷ 25.4)
- 25 millimeters = 0.984252 in (25 ÷ 25.4)
- 50 millimeters = 1.9685 in (50 ÷ 25.4)
Where this conversion comes up
Millimeters are used for screw and drill sizes, rainfall, paper and phone dimensions; inches for screens, tools, lumber and US body measurements. Drill bits, wrenches, bolts and jewelry are often sized in millimeters while US tape measures read in inches and fractions. 25.4 mm is exactly one inch, so a 6 mm bit is just under 1/4 in (6.35 mm).
Quick estimate
Divide by 25 for a quick estimate (1.6% high): 50 mm ≈ 2 in (exact 1.969).
Common mistakes
- Multiplying instead of dividing. A inch is larger than a millimeter, so the number of inches must come out smaller: 10 millimeters = 0.393701 in.
- Rounding too early. Keep the full factor until the last step; rounding 0.0394 to 0.04 first puts large values noticeably off.
Going the other way? Use the inches to mm converter. Related length converters: inches to feet, feet to inches, meters to feet, feet to meters, feet to cm, cm to mm.
Frequently asked questions
How do you convert millimeters to inches?
Multiply the millimeters by 0.0393700787 (or divide by 25.4). For example, 25 millimeters is 0.984252 inches.
How many inches are in one millimeter?
One millimeter is 0.0393700787 inches. A millimeter is one thousandth of a meter.
What is 50 millimeters in inches?
50 millimeters is 1.9685 inches.
Is there a quick way to estimate millimeters to inches?
Divide by 25 for a quick estimate (1.6% high): 50 mm ≈ 2 in (exact 1.969).
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