Length

inch to mm converter

Type a value to convert inch to mm instantly. 1 inch equals about 25.4 mm.

Enter inch

⇄ Convert mm to inch instead

inch → mm
25.4mm
1 inch converted
How to convert
mm = inch × 25.4
Reverse: inch = mm × 0.0393700787

Converting inch to mm

inch and mm (millimeter) are units of length. One inch equals 25.4 mm. Just type a value in the box above to convert instantly — useful for recipes, drawings, product specs and travel between metric and imperial units.

inch to mm conversion chart

inchmm
1 inch25.4 mm
2 inch50.8 mm
3 inch76.2 mm
5 inch127 mm
10 inch254 mm
20 inch508 mm
50 inch1,270 mm
100 inch2,540 mm

Frequently asked questions

How many mm are in one inch?
1 inch = 25.4 mm.
How do I convert mm back to inch?
Multiply the mm value by 0.0393700787 to get inch.
Is my input sent to a server?
No. Everything is calculated locally in your browser and nothing is uploaded or stored.