To convert 0.3125 as a fraction, just the right formula and calculations need to be done. 

So below mentioned are the simple three steps for that:

1. Write 0.3125 in the form of a simple fraction ie. 0.3125/1.

2. Multiply both numerator and denominator of this simple fraction by 10 for every number present after the decimal point ie. 0.3125*10000/1*10000 which will give you 3125/1000.

3. Now, reduce the obtained fraction by dividing it by its multiples or common factor which will become 5/16.

And so the final result and value we get on converting 0.3125 as a fraction comes out to be 5/16.