Inch → Millimeter (in → mm)

1 in = 25.4 mm
1 Inch (in) = 25.4 Millimeter (mm).

Inch (in):


Millimeter (mm):

If you want to reverse convert, use Millimeter → Inch. 1 mm = 0.039370078740157 in. You can also explore the full Length converter page for more cross conversions.

Conversion formula

Inch to Millimeter formula: value in mm = value in in × 25.4.

Millimeter to Inch formula: value in in = value in mm × 0.039370078740157.

How to convert Inch to Millimeter

To convert Inch to Millimeter, multiply the value in in by 25.4. This gives the result in mm.

For example, 1 in = 25.4 mm and 10 in = 254 mm.

What is Inch?

Inch (in): Used for screen diagonals, pipe sizes and component dimensions. A screen’s inch size refers to its diagonal rather than its width. 1 in = 2.54 cm = 25.4 mm.

What is Millimeter?

Millimeter (mm): One thousandth of a metre. Screw diameters, sheet thicknesses and small dimensions on technical drawings commonly use this finer scale. 1 mm = 0.1 cm = 0.001 m.

FAQ

Inch → other Length units

• 1 inch → meter = 0.0254 meter
• 1 inch → kilometer = 2.54E-5 kilometer
• 1 inch → decimeter = 0.254 decimeter
• 1 inch → centimeter = 2.54 centimeter
• 1 inch → millimeter = 25.4 millimeter
• 1 inch → micrometer = 25400 micrometer
• 1 inch = 25400000 nanometer
• 1 inch = 25400000000 picometer
• 1 inch → nautical mile = 1.3714902807775E-5 nautical mile
• 1 inch → mile = 1.5782828282828E-5 mile
• 1 inch → fathom = 0.013888888888889 fathom
• 1 inch → yard = 0.027777777777778 yard
• 1 inch → feet = 0.083333333333333 feet
• 1 inch → hand = 0.25 hand
• 1 inch = 1.6978851290562E-13 astronomical unit
• 1 inch = 2.6847821184225E-18 lightyear
• 1 inch = 8.2315793951886E-19 parsec

Inch → Millimeter Table

The table below shows common values from Inch to Millimeter and the reverse direction for quick reference.

Millimeter → Inch Table

Millimeter → Inch

The reverse value is 1 mm = 0.039370078740157 in.