MM → Inches
0.9 mm to inches
0.9 millimeters equals 0.035433 inches — or about 1/16" (nearest 1/16″).
Decimal
0.0354 in
Fraction
1/16"
Centimeters
0.09 cm
Feet
0.003 ft
mm
0.035433
in≈ 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 = 0.9 ÷ 25.4 = 0.035433
Why 0.9 mm = 0.0354 in
Since 1 inch is defined as exactly 25.4 millimeters, 0.9 mm converts to 0.035433 inches. Rounded to the nearest 1/16″ that's 1/16", which is what you'd read off a standard imperial ruler.