Conversion formula

The conversion factor from inches to millimeters is 25.4, which means that 1 inch is equal to 25.4 millimeters:

1 in = 25.4 mm

To convert 2.5 inches into millimeters we have to multiply 2.5 by the conversion factor in order to get the length amount from inches to millimeters. We can also form a simple proportion to calculate the result:

1 in → 25.4 mm

2.5 in → L_(mm)

Solve the above proportion to obtain the length L in millimeters:

L_(mm) = 2.5 in × 25.4 mm

L_(mm) = 63.5 mm

The final result is:

2.5 in → 63.5 mm

We conclude that 2.5 inches is equivalent to 63.5 millimeters:

2.5 inches = 63.5 millimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 0.015748031496063 × 2.5 inches.

Another way is saying that 2.5 inches is equal to 1 ÷ 0.015748031496063 millimeters.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that two point five inches is approximately sixty-three point five millimeters:

2.5 in ≅ 63.5 mm

An alternative is also that one millimeter is approximately zero point zero one six times two point five inches.

Conversion table

inches to millimeters chart

For quick reference purposes, below is the conversion table you can use to convert from inches to millimeters