Inches to Millimeters
Convert inches to millimeters with our free calculator. Factors are exact by international definition.
Result in Millimeters (mm)
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1 inch = 25.4 millimeters
10 inches = 254 millimeters
To convert inches to millimeters, multiply by 25.4.
More length conversions
Frequently asked questions
How many millimeters are in a inch?
There are 25.4 millimeters in 1 inch. In other words, 1 inch equals 25.4 millimeters.
How do you convert inches to millimeters?
Multiply the inches value by 25.4. For example, 10 inches = 254 millimeters.
Is a inch bigger than a millimeter?
Yes — a inch is larger than a millimeter. 1 inch equals 25.4 millimeters, so it is about 25.4 times a millimeter.