Inches (in) to Millimeters (mm) Converter
Inches (in) to Millimeters (mm) conversion table
Here are the most common conversions for Inches (in) to Millimeters (mm) at a glance.
| Inches (in) | Millimeters (mm) |
|---|---|
| 0.001 | 0.02540000 |
| 0.01 | 0.25400000 |
| 0.1 | 2.54000000 |
| 1 | 25.40000000 |
| 2 | 50.80000000 |
| 3 | 76.20000000 |
| 5 | 127 |
| 10 | 254 |
| 20 | 508 |
| 30 | 762 |
| 50 | 1,270 |
| 100 | 2,540 |
| 1000 | 25,400.00000000 |
Inches to Millimeters (in to mm) Converter
Use our free Inches to Millimeters converter to change any value from in to mm instantly and accurately. 1 inch equals 25.4 millimeters, and 1 millimeter equals 0.03937007874 inches. Enter a number, choose the precision and get the result in one click.
Inch to Millimeter formula
To convert inches to millimeters, multiply the number of inches by 25.4:
mm = in × 25.4
Example: 25 in × 25.4 = 635 mm.
Inches to Millimeters conversion table
| Inches (in) | Millimeters (mm) |
|---|---|
| 1 in | 25.4 mm |
| 5 in | 127 mm |
| 10 in | 254 mm |
| 25 in | 635 mm |
| 50 in | 1,270 mm |
| 100 in | 2,540 mm |
| 1,000 in | 25,400 mm |
Inch and Millimeter explained
Inch (in): An inch is exactly 2.54 centimeters. It is used in the US and UK for screen sizes, tyres, paper and construction.
Millimeter (mm): A millimeter is one thousandth of a meter. It is used for small, precise measurements such as screws, jewellery, paper thickness and rainfall.
How to use the Inch to Millimeter converter
- Enter the value in inches (in).
- Choose the number of decimal places (precision).
- Click Submit to convert.
- Read or copy the result in millimeters (mm).
Common use cases
- Converting length measurements for work, school or travel
- Checking length values in product specifications
- Quickly comparing metric and imperial or binary and decimal values
- Double-checking manual calculations
Frequently asked questions
How many millimeters are in 1 inch?
There are 25.4 millimeters in one inch.
How do I convert millimeters back to inches?
Multiply by 0.03937007874, or use our Millimeter to Inch converter.
Is this converter accurate?
Yes. It uses the official international conversion factors and lets you choose the number of decimal places.
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