MM → Inches
25 mm to inches
25 millimeters equals 0.984252 inches — or about 1" (nearest 1/16″).
Decimal
0.9843 in
Fraction
1"
Centimeters
2.5 cm
Feet
0.082 ft
mm
0.984252
in≈ 1" (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 = 25 ÷ 25.4 = 0.984252
Why 25 mm = 0.9843 in
Since 1 inch is defined as exactly 25.4 millimeters, 25 mm converts to 0.984252 inches. Rounded to the nearest 1/16″ that's 1", which is what you'd read off a standard imperial ruler.