MM → Inches
800 mm to inches
800 millimeters equals 31.496063 inches — or about 31 1/2" (nearest 1/16″).
Decimal
31.4961 in
Fraction
31 1/2"
Centimeters
80 cm
Feet
2.6247 ft
mm
31.496063
in≈ 31 1/2" (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 = 800 ÷ 25.4 = 31.496063
Why 800 mm = 31.4961 in
Since 1 inch is defined as exactly 25.4 millimeters, 800 mm converts to 31.496063 inches. Rounded to the nearest 1/16″ that's 31 1/2", which is what you'd read off a standard imperial ruler.