MM → Inches
28.5 mm to inches
28.5 millimeters equals 1.122047 inches — or about 1 1/8" (nearest 1/16″).
Decimal
1.122 in
Fraction
1 1/8"
Centimeters
2.85 cm
Feet
0.0935 ft
mm
1.122047
in≈ 1 1/8" (nearest 1/16)
1 in = 25.4 mm · tolerance ±0.0001
Formula
To convert mm to inches, divide by 25.4:
inches = mm ÷ 25.4
inches = 28.5 ÷ 25.4 = 1.122047
Why 28.5 mm = 1.122 in
Since 1 inch is defined as exactly 25.4 millimeters, 28.5 mm converts to 1.122047 inches. Rounded to the nearest 1/16″ that's 1 1/8", which is what you'd read off a standard imperial ruler.