MM → Inches
255 mm to inches
255 millimeters equals 10.03937 inches — or about 10 1/16" (nearest 1/16″).
Decimal
10.0394 in
Fraction
10 1/16"
Centimeters
25.5 cm
Feet
0.8366 ft
mm
10.03937
in≈ 10 1/16" (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 = 255 ÷ 25.4 = 10.03937
Why 255 mm = 10.0394 in
Since 1 inch is defined as exactly 25.4 millimeters, 255 mm converts to 10.03937 inches. Rounded to the nearest 1/16″ that's 10 1/16", which is what you'd read off a standard imperial ruler.