MM → Inches

31.75 mm to inches

31.75 millimeters equals 1.25 inches — or about 1 1/4" (nearest 1/16″).

Decimal

1.25 in

Fraction

1 1/4"

Centimeters

3.175 cm

Feet

0.1042 ft

Millimeters (mm)

Inches (in)

1.25

≈ 1 1/4" (nearest 1/16)

1 in = 25.4 mm · tolerance ±0.0001

Nearby values

31.8 mm 32 mm 31 mm 30.5 mm 33 mm 30 mm 34 mm 29 mm 28.6 mm 28.5 mm

Precision

1.25

Inches

31.8 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 = 31.75 ÷ 25.4 = 1.25

Why 31.75 mm = 1.25 in

Since 1 inch is defined as exactly 25.4 millimeters, 31.75 mm converts to 1.25 inches. Rounded to the nearest 1/16″ that's 1 1/4", which is what you'd read off a standard imperial ruler.