What is the **5.03937 Constant**? well, I have the need to share this information, because there are many visitors and subscribers of the YouTube channel who ask me this very often: **How to Obtain the 5.03937 Constant**?

This constant is part of the method to **convert millimeters to fractions of known inches.**

The constant is actually **5.03937/128**, a value that is in inches.

If we divide this figure or the numerator against the denominator the result is 0.03937 inches which is equivalent to 1 millimeter.

Now, if you have a value in millimeters and if it is multiplied by 1, nothing happens, the value in millimeters does not change.

What I do in my method is multiply a value in millimeters by a special 1.

This special value is a fraction that is in inches (5.03937/128). With this I get a fractional in inches.

The value **5.03937** went from looking for a number that met a condition:

Find a figure that is equivalent to 1 mm. in inches (0.03937) and at the same time having the denominator value 128:

This way we obtain a simple equation:

**0.03937 = X/128**

Now we are going to clear the variable X

then, **128(0.03937) = X**

Resolving: **X = 5.03937**

That’s the whole thing, it’s not hard.

I hope this information will help and that when you take your conversion exams and if your teachers ask you where you got the **5.03937 constant**, you can explain this method.