Inch to Millimeter

1 in = 25.4 mm

Value

From

Precision & format

Significant figures

Notation

Show fractions

1 in equals

25.4mm

All 28 units

Meterm
0.02541⁄32
Kilometerkm
0.00002540
Centimetercm
2.542 35⁄64
Millimetermm
25.425 13⁄32
Milemi
0.000015782828280
Yardyd
0.027777777781⁄32
Footft
0.083333333335⁄64
Inchin
11
Decimeterdm
0.2541⁄4
Hectometerhm
0.0002540
Dekameterdam
0.002540
Micrometerµm
25,40025400
Nanometernm
25,400,000
Picometerpm
25,400,000,000
Femtometerfm
25,400,000,000,000
AngstromÅ
254,000,000
Nautical milenmi
0.000013714902810
Furlongfur
0.00012626262630
Chainch
0.0012626262630
Rodrd
0.0050505050510
Fathomftm
0.013888888891⁄64
Linkli
0.12626262631⁄8
Milmil
thou
1,0001000
Handhh
4 in
0.251⁄4
Leaguelea
US land, 3 mi
0.0000052609427610
Astronomical unitau
1.697885129 × 10⁻¹³0
Light yearly
2.684782118 × 10⁻¹⁸0
Parsecpc
8.231579395 × 10⁻¹⁹0

Inch to Millimeter table

Common Inch values converted to Millimeter
Inch (in)	Millimeter (mm)
1	25.4
2	50.8
5	127
10	254
20	508
50	1,270
100	2,540
250	6,350
500	12,700
1,000	25,400

How the conversion works

Multiply the inch figure by 25.4 to get millimeter. Every factor on this site is anchored to the SI base unit for length, so the same number is used everywhere it appears.

Going the other way, 1 mm = 0.039370079 in — see millimeter to inch.

See all 28 length units →