Inch (in) to Millimeter (mm)

1 in = 25.4 mm. Free Length converter from Inch to Millimeter.

About Length

Free Length converter from Inch (in) to Millimeter (mm). The base rate is 1 in = 25.4 mm; enter any number for an instant conversion using standard factors.

Popular conversions

km → mi km → m km → ft km → cm km → in km → yd km → mm mi → km

Frequently asked questions

Are the results accurate?

We use standard financial formulas and official rates, but results are for reference only. Confirm important decisions with a professional.

Is my input data stored?

No. All calculations run only in your browser — nothing is sent to or stored on our servers.

Is it free to use?

Yes, completely free, with no sign-up or login required.