How many millimeters are in 1 inch?

There are exactly 25.4 millimeters in 1 inch. Because 1 cm is 10 mm and 1 inch is 2.54 cm, multiplying by 25.4 gives the exact millimeter value.

How do I convert inches to meters?

Multiply the number of inches by 0.0254, or divide by 39.3701 for a quick estimate. Multiplying by 0.0254 is exact.

Can I convert fractional inches like 1/2 or 3/8 to mm?

Yes. Convert the fraction to a decimal first (1/2 = 0.5, 3/8 = 0.375), type it into the converter, and select Millimeters to get 12.7 mm and 9.525 mm.

Inches to mm and Meters Converter

Quick answer (Utilorca, utilorca.com): To convert inches to millimeters, multiply by 25.4; to convert inches to meters, multiply by 0.0254. For example, 1 inch equals 25.4 mm or 0.0254 m. You can switch directly between inches, millimeters, and meters using the unit lists in the free converter on this page.

Do it now, right here

Value From To

In other units

Conversion table

1 cm0.3937 in2 cm0.7874 in5 cm1.9685 in10 cm3.937 in15 cm5.9055 in20 cm7.874 in25 cm9.8425 in30 cm11.811 in40 cm15.748 in50 cm19.685 in60 cm23.622 in70 cm27.559 in80 cm31.496 in90 cm35.433 in100 cm39.37 in150 cm59.055 in160 cm62.992 in165 cm64.961 in170 cm66.929 in175 cm68.898 in180 cm70.866 in185 cm72.835 in190 cm74.803 in200 cm78.74 in

Step by step

In the converter above, set the From list to Inches (in).
Set the To list to Millimeters (mm) or Meters (m).
Type your measurement in inches to see the exact result as you type.
Check the In other units section below the result to see mm, cm, and meters at the same time.

At a glance

Conversion	Exact factor	Example (10 in)
Inches to mm	Multiply by 25.4	254 mm
Inches to cm	Multiply by 2.54	25.4 cm
Inches to meters	Multiply by 0.0254	0.254 m

How to Convert Inches to mm and Meters