Inches to Millimeters Conversion

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How to convert inches to millimeters

1 inch is equal to 25.4 millimeters:

1 in = 25.4 mm

When a distance L in inches is multiplied by 25.4, it gives distance in millimeters.

L_mm = L_in × 25.4

Example

To convert 5 inches into millimeters, it is multiplied by 25.4:

(5 in) × 25.4 = 127 mm

Inches

The inch (abbreviation: in or ″) is a unit of length in the British imperial and United States customary systems of measurement. It is equal to ¹⁄₃₆ yard or ¹⁄₁₂ of a foot. In 1930, the British Standards Institution adopted an inch of exactly 25.4 mm. The American Standards Association followed suit in 1933.

Millimeters

The millimeters is a unit of length in the metric system. It is equal to ¹⁄₁₀₀₀ of a meter. The SI symbol of centimeter is mm. It is a practical and most frequently used unit of length for many everyday measurements.

Quick Conversion Table

The quick inch to millimeter conversion table is given below:

Inches	Millimeters
1 in	25.4 mm
2 in	50.8 mm
3 in	76.2 mm
4 in	101.6 mm
5 in	127 mm
6 in	152.4 mm
7 in	177.8 mm
8 in	203.2 mm
9 in	228.6 mm
10 in	254 mm
20 in	508 mm
50 in	1270 mm
100 in	2540 mm