MM → Inches
164 mm to inches
164 millimeters equals 6.456693 inches — or about 6 7/16" (nearest 1/16″).
Decimal
6.4567 in
Fraction
6 7/16"
Centimeters
16.4 cm
Feet
0.5381 ft
mm
6.456693
in≈ 6 7/16" (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 = 164 ÷ 25.4 = 6.456693
Why 164 mm = 6.4567 in
Since 1 inch is defined as exactly 25.4 millimeters, 164 mm converts to 6.456693 inches. Rounded to the nearest 1/16″ that's 6 7/16", which is what you'd read off a standard imperial ruler.