MM → Inches
108 mm to inches
108 millimeters equals 4.251969 inches — or about 4 1/4" (nearest 1/16″).
Decimal
4.252 in
Fraction
4 1/4"
Centimeters
10.8 cm
Feet
0.3543 ft
mm
4.251969
in≈ 4 1/4" (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 = 108 ÷ 25.4 = 4.251969
Why 108 mm = 4.252 in
Since 1 inch is defined as exactly 25.4 millimeters, 108 mm converts to 4.251969 inches. Rounded to the nearest 1/16″ that's 4 1/4", which is what you'd read off a standard imperial ruler.