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inches to mm | Exact Decimal + Formula

1 Inch = 25.4 Millimeter

Converting inches to millimeters is essential in machining, industrial design, and woodworking to adapt imperial measurements to global metric standards.

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Formula

mm = in × 25.399999994

To convert Inch to Millimeter, use the formula displayed above.

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Inch to Millimeter: Quick Reference Table

Inch Millimeter (Decimal) Fraction
0.001 in 0.0254 mm -
0.01 in 0.254 mm -
0.1 in 2.54 mm -
0.5 in 12.7 mm -
1 in 25.4 mm -
2 in 50.8 mm -
5 in 127 mm -
10 in 254 mm -
25 in 635 mm -
50 in 1270 mm -
100 in 2539.999999 mm -
250 in 6349.999998 mm -
500 in 12699.999997 mm -
1000 in 25399.999994 mm -

in to mm Formula and Examples

Direct Formula mm = in × 25.399999994
Inverse Formula in = mm × 0.03937
Mental Math Shortcut

Multiply the value by roughly 25.4 to calculate the equivalent amount in your head.

How to Convert Inch to Millimeter

How many millimeters are in a inch?
1 Inch (in) is equal to 25.4 Millimeter (mm). To convert inchs to millimeters, multiply your value by 25.4.
How do I convert inch to millimeter?
To convert Inch to Millimeter, use the formula: Millimeter = Inch × 25.4. For example, 5 in = 127 mm.
What is the formula for in to mm?
The formula is: mm = in × 25.4. This is based on the exact SI conversion factor. Use our calculator above to convert any value instantly.