Numerly

1 inches to mm

1 inches = 25.4 millimeters

Need a different number? Type into either field below — it converts as you type.

By Numerly · Updated

How 1 inches to mm is calculated

Multiply by 25.4: 1 × 25.4 = 25.4. (1 in = 25.4 mm.)

Going the other way, 1 millimeter = 0.03937 inches.

Values near 1 in

inchesmillimeters
1 in25.4 mm
2 in50.8 mm
3 in76.2 mm
4 in101.6 mm
5 in127 mm

Frequently asked

What is 1 inches to mm?
1 inches equals 25.4 millimeters.
How do you convert 1 inches to millimeters?
Multiply by 25.4: 1 × 25.4 = 25.4. (1 in = 25.4 mm.)
Is 1 in more or less than 25.4 mm?
They are equal — 1 inches is exactly 25.4 millimeters.
Full converterInches to millimeters converter
ReverseMillimeters to inches converter(25.4 mm = 1 in)

Popular in to mm conversions