MM → Inches

2.54 mm to inches

2.54 millimeters equals 0.1 inches — or about 1/8" (nearest 1/16″).

Decimal

0.1 in

Fraction

1/8"

Centimeters

0.254 cm

Feet

0.0083 ft

Millimeters (mm)

Inches (in)

0.1

≈ 1/8" (nearest 1/16)

1 in = 25.4 mm · tolerance ±0.0001

Nearby values

2.5 mm 2.6 mm 2.4 mm 2.7 mm 2.3 mm 2.8 mm 2.25 mm 2.2 mm 2.9 mm 2.1 mm

Precision

0.1

Inches

2.5 mm · max 100

Ref · 25.4 mm/in

Drag to set

Formula

To convert mm to inches, divide by 25.4:

inches = mm ÷ 25.4
inches = 2.54 ÷ 25.4 = 0.1

Why 2.54 mm = 0.1 in

Since 1 inch is defined as exactly 25.4 millimeters, 2.54 mm converts to 0.1 inches. Rounded to the nearest 1/16″ that's 1/8", which is what you'd read off a standard imperial ruler.