Inches → MM

3 inches to mm

3 inches equals 76.2 millimeters.

Millimeters

76.2 mm

Centimeters

7.62 cm

Meters

0.0762 m

Feet

0.25 ft

Inches (in)

Millimeters (mm)

76.2

1 in = 25.4 mm · tolerance ±0.0001

Nearby values

2.875″3.125″3.15″2.8″2.75″3.25″2.7″2.625″3.375″2.6″

Precision

Inches

76.2 mm · max 100

Ref · 25.4 mm/in

Drag to set

Formula

mm = inches × 25.4
mm = 3 × 25.4 = 76.2

Why 3 in = 76.2 mm

The international inch is defined as exactly 25.4 mm, so any inches-to-mm conversion is a clean multiplication with no rounding required at this precision.