# Convert 40 mm to fm

In this article I will show you how to convert 40 millimeters into fathoms. Throughout the explanation below I might also call it 40 mm to fm. They are the same thing!

## How to Convert Millimeters to Fathoms

A millimeter is smaller than a fathom. I know that a mm is smaller than a fm 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 40 millimeters into fathoms, we use a conversion factor to get the answer.

The conversion factor for mm to fm is:

1 mm = 0.00054680664916885 fm

Now that we know what the conversion factor is, we can easily calculate the conversion of 40 mm to fm by multiplying `0.00054680664916885` by the number of millimeters we have, which is 40.

40 x 0.00054680664916885 = 0.021872265966754 fm

So, the answer to the question "what is 40 millimeters in fathoms?" is 0.021872265966754 fm.

## Millimeters to Fathoms Conversion Table

Below is a sample conversion table for mm to fm:

Millimeters (mm) Fathoms (fm)
0.010
0.10
10
20
30
50
100.01
200.01
500.03
1000.05
10000.55

## Best Conversion Unit for 40 mm

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 40 mm.

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 40 mm is inches and the amount is 1.5748031496063 in.