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 1000 inches into millimeters we have to multiply 1000 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

1000 in → L_(mm)

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

L_(mm) = 1000 in × 25.4 mm

L_(mm) = 25400 mm

The final result is:

1000 in → 25400 mm

We conclude that 1000 inches is equivalent to 25400 millimeters:

1000 inches = 25400 millimeters

Alternative conversion

We can also convert by utilizing the inverse value of the conversion factor. In this case 1 millimeter is equal to 3.9370078740157E-5 × 1000 inches.

Another way is saying that 1000 inches is equal to 1 ÷ 3.9370078740157E-5 millimeters.

Approximate result

For practical purposes we can round our final result to an approximate numerical value. We can say that one thousand inches is approximately twenty-five thousand four hundred millimeters:

1000 in ≅ 25400 mm

An alternative is also that one millimeter is approximately zero times one thousand 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