Convert millimeter to inch

1 mm = 0.03937007874 in

1 mm = 0.0394 in

1 mm in every length unit

femtometer	1,000,000,000,000 fm
picometer	1,000,000,000 pm
nanometer	1,000,000 nm
micrometer	1,000 μm
millimeter	1 mm
centimeter	0.1 cm
decimeter	0.01 dm
meter	0.001 m
kilometer	0.000001 km
inch	0.0394 in
foot	0.00328 ft
yard	0.00109 yd
mile	6.21e-07 mi
nautical mile	5.40e-07 nmi
astronomical unit	6.68e-15 AU
light-year	1.06e-19 ly
parsec	3.24e-20 pc

How the conversion works

Multiply by 0.03937007874 to go from millimeter to inch, or divide by it to go back. Every conversion on this site routes through the SI value (m) rather than a table of pairwise factors, so a round-trip returns exactly what you started with.

Going the other way? inch to millimeter — 1 in = 25.4 mm.

millimeter to inch — common values

1 mm	0.039370079 in
2 mm	0.078740157 in
3 mm	0.11811024 in
5 mm	0.19685039 in
10 mm	0.39370079 in
15 mm	0.59055118 in
20 mm	0.78740157 in
25 mm	0.98425197 in
50 mm	1.9685039 in
75 mm	2.9527559 in
100 mm	3.9370079 in
250 mm	9.8425197 in
500 mm	19.685039 in
1000 mm	39.370079 in

Other length conversions

mm → cm mm → m mm → km mm → ft mm → yd mm → mi mm → μm mm → nm

All length units →

Solvers that use length