# Convert 15 in to mm

In this article I will show you how to convert 15 inches into millimeters. Throughout the explanation below I might also call it 15 in to mm. They are the same thing!

## How to Convert Inches to Millimeters

A inch is greater than a millimeter. I know that a in is greater than a mm because of something called conversion factors.

Put very simply, a conversion factor is a number that can be used to change one set of units to another, by multiplying or dividing it. So when we need to convert 15 inches into millimeters, we use a conversion factor to get the answer.

The conversion factor for in to mm is:

1 in = 25.4 mm

Now that we know what the conversion factor is, we can easily calculate the conversion of 15 in to mm by multiplying `25.4` by the number of inches we have, which is 15.

15 x 25.4 = 381 mm

So, the answer to the question "what is 15 inches in millimeters?" is 381 mm.

## Inches to Millimeters Conversion Table

Below is a sample conversion table for in to mm:

Inches (in) Millimeters (mm)
0.010.25
0.12.54
125.4
250.8
376.2
5127
10254
20508
501270
1002540
100025400

## Best Conversion Unit for 15 in

Sometimes when you work with conversions from one unit to another, the numbers can get a little confusing. Especially when dealing with really large numbers.

I've also calculated what the best unit of measurement is for 15 in.

To determine which unit is best, I decided to define that as being the unit of measurement which is as low as possible, without going below 1. Smaller numbers are more easily understood and can make it easier for you to understand the measurement.

The best unit of measurement I have found for 15 in is us survey feet and the amount is 1.2499975 ft-us.