MM → Inches
300 mm to inches
300 millimeters equals 11.811024 inches — or about 11 13/16" (nearest 1/16″).
Decimal
11.811 in
Fraction
11 13/16"
Centimeters
30 cm
Feet
0.9843 ft
mm
11.811024
in≈ 11 13/16" (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 = 300 ÷ 25.4 = 11.811024
Why 300 mm = 11.811 in
Since 1 inch is defined as exactly 25.4 millimeters, 300 mm converts to 11.811024 inches. Rounded to the nearest 1/16″ that's 11 13/16", which is what you'd read off a standard imperial ruler.