Inches to MM Converter
Convert inches to millimeters with accurate formulas, examples and conversion tables.
Length conversion
Calculator
Results update instantly. Use Calculate to confirm the current conversion.
Result
1 in ≈ 25.4 mm
Live result is ready.
Popular length conversions
Open a focused converter for a commonly searched length conversion.
Centimeters to Inches1 cm = 0.39370079 inInches to Centimeters1 in = 2.54 cmMeters to Feet1 m = 3.2808399 ftFeet to Meters1 ft = 0.3048 mKilometers to Miles1 km = 0.62137119 miMiles to Kilometers1 mi = 1.609344 kmMillimeters to Inches1 mm = 0.03937008 inInches to Millimeters1 in = 25.4 mmYards to Meters1 yd = 0.9144 mMeters to Yards1 m = 1.0936133 yd
Conversion table
Common inches to millimeters values, generated from the selected units.
| inches (in) | millimeters (mm) |
|---|---|
| 1 inch | 25.4 millimeters |
| 5 inches | 127 millimeters |
| 10 inches | 254 millimeters |
| 20 inches | 508 millimeters |
| 50 inches | 1,270 millimeters |
| 100 inches | 2,540 millimeters |
Conversion Formula
Multiply the value in inches by 25.4 to get millimeters.
Formula
mm = in × 25.4Example
Convert 1 inch to millimeters:
1 × 25.4= 25.4 mmUnit information
Concise reference information for the selected source and target units.
Inch (in)
Imperial- Definition
- One international inch equals exactly 25.4 millimeters.
- Usage
- Common in the United States and for screens, hardware, and construction materials.
Millimeter (mm)
Metric- Definition
- One millimeter is one-thousandth of a meter.
- Usage
- Used for precise dimensions, manufacturing, medicine, and rainfall.
Frequently asked questions
How many millimeters are in 1 inch?
1 inch equals 25.4 millimeters.
How do you convert inches to millimeters?
Multiply the value in inches by 25.4 to get millimeters. The formula is mm = in × 25.4.
What is 10 inches in millimeters?
10 inches is approximately 254 millimeters.