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Inches to Millimeters Converter

1 in = 25.4 mm. Type any value to convert inches to millimeters.

1 in = 25.4 mm

Formula: mm = in × 25.4

Common values
Decimals
In every unit 22 units
Nanometer (nm) 25,400,000 nm
Micrometer (µm) 25,400 µm
Millimeter (mm) 25.4 mm
Centimeter (cm) 2.54 cm
Decimeter (dm) 0.254 dm
Meter (m) 0.0254 m
Kilometer (km) 0.0000254 km
Inch (in) 1 in
Foot (ft) 0.08333333333 ft
Yard (yd) 0.02777777778 yd
Mile (mi) 0.00001578282828 mi
Nautical mile (nmi) 0.00001371490281 nmi
Mil (thou) (mil) 1,000 mil
Hand (hh) 0.25 hh
Fathom (ftm) 0.01388888889 ftm
Chain (ch) 0.001262626263 ch
Furlong (fur) 0.0001262626263 fur
League (lea) 0.000005260942761 lea
Ångström (Å) 254,000,000 Å
Astronomical unit (au) 1.697885129 × 10⁻¹³ au
Light-year (ly) 2.684782118 × 10⁻¹⁸ ly
Parsec (pc) 8.231579395 × 10⁻¹⁹ pc

Convert on our server?

If you continue, the file is uploaded over an encrypted connection and converted on our server. You can keep using the site meanwhile. The original is deleted as soon as it is converted; the result is kept for 6 hours so you can download it, and you can delete it at any time. Files are never shared or used for anything else.

Calculated in your browser – nothing you type is sent anywhere. Privacy details

Inches to millimeters table

Formula: mm = in × 25.4

Inch (in)Millimeter (mm)
0.1 in2.54 mm
0.25 in6.35 mm
0.5 in12.7 mm
1 in25.4 mm
2 in50.8 mm
3 in76.2 mm
4 in101.6 mm
5 in127 mm
6 in152.4 mm
7 in177.8 mm
8 in203.2 mm
9 in228.6 mm
10 in254 mm
12 in304.8 mm
15 in381 mm
20 in508 mm
25 in635 mm
30 in762 mm
40 in1,016 mm
50 in1,270 mm
60 in1,524 mm
75 in1,905 mm
100 in2,540 mm
150 in3,810 mm
200 in5,080 mm
250 in6,350 mm
500 in12,700 mm
1,000 in25,400 mm

How to use: Inches to Millimeters

  1. 1 Type the value in inches.
  2. 2 The result in millimeters appears at once – or type in the millimeters field to convert back.
  3. 3 Pick a common value, round to fewer decimals or swap the units with one click.
  4. 4 Copy the result, or open “In every unit” to see the value in all units of length.

About this tool

Inch (in) is a unit of length (imperial and US customary); 1 in = 0.0254 m. Millimeter (mm) is a unit of length (SI); 1 mm = 0.001 m.

To convert inches to millimeters, multiply the value by 25.4 (mm = in × 25.4). Example: 10 in = 254 mm.

Calculated in your browser – nothing you type is sent anywhere.

Frequently asked questions

How do I convert inches to millimeters?

To convert inches to millimeters, multiply the value by 25.4: mm = in × 25.4. For example 10 in = 254 mm.

What is 1 in in millimeters?

1 in = 25.4 mm. The other way round, 1 mm = 0.03937007874 in.

How exact is the result?

The converter uses the official definitions of both units and shows up to 10 significant digits; choose 0–6 decimals to round. Both units are defined exactly in terms of each other, so the factor itself is exact.

Can I convert other units of length here?

Yes – choose any of the 22 units of length in the From and To lists, or switch to another measurement at the top.

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