MM → Inches
85 mm to inches
85 millimeters equals 3.346457 inches — or about 3 3/8" (nearest 1/16″).
Decimal
3.3465 in
Fraction
3 3/8"
Centimeters
8.5 cm
Feet
0.2789 ft
mm
3.346457
in≈ 3 3/8" (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 = 85 ÷ 25.4 = 3.346457
Why 85 mm = 3.3465 in
Since 1 inch is defined as exactly 25.4 millimeters, 85 mm converts to 3.346457 inches. Rounded to the nearest 1/16″ that's 3 3/8", which is what you'd read off a standard imperial ruler.