MM → Inches

12.5 mm to inches

12.5 millimeters equals 0.492126 inches — or about 1/2" (nearest 1/16″).

Decimal

0.4921 in

Fraction

1/2"

Centimeters

1.25 cm

Feet

0.041 ft

Millimeters (mm)

Inches (in)

0.492126

≈ 1/2" (nearest 1/16)

1 in = 25.4 mm · tolerance ±0.0001

Nearby values

12.4 mm 12.7 mm 12.25 mm 12.75 mm 12 mm 13 mm 11.75 mm 11.5 mm 13.5 mm 13.75 mm

Precision

0.4921

Inches

12.5 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 = 12.5 ÷ 25.4 = 0.492126

Why 12.5 mm = 0.4921 in

Since 1 inch is defined as exactly 25.4 millimeters, 12.5 mm converts to 0.492126 inches. Rounded to the nearest 1/16″ that's 1/2", which is what you'd read off a standard imperial ruler.