MM → Inches
120 mm to inches
120 millimeters equals 4.724409 inches — or about 4 3/4" (nearest 1/16″).
Decimal
4.7244 in
Fraction
4 3/4"
Centimeters
12 cm
Feet
0.3937 ft
mm
4.724409
in≈ 4 3/4" (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 = 120 ÷ 25.4 = 4.724409
Why 120 mm = 4.7244 in
Since 1 inch is defined as exactly 25.4 millimeters, 120 mm converts to 4.724409 inches. Rounded to the nearest 1/16″ that's 4 3/4", which is what you'd read off a standard imperial ruler.