//Length Conversion Instrument
Convert Inches to Millimetres
Enter the amount of inches you want to convert to millimetres.
//Method
How to convert inches to millimetres
To convert inches to millimetres, multiply the number of inches by 25.4. One inch equals 25.4 millimetres. For example, 5 inches = 5 × 25.4 = 127 millimetres.
//Reference
Common questions
- What is the formula to convert inches to millimetres?
- To convert inches to millimetres, multiply the value by 25.4. The formula is millimetres = inches × 25.4.
- How many millimetres are in one inch?
- One inch equals 25.4 millimetres. This is a fixed conversion factor, so every inch always converts to the same number of millimetres.
- What is the difference between a inch and a millimetre?
- The inch is a imperial unit of length and the millimetre is a metric unit of length. Converting between them lets you compare measurements across systems.