How do I calculate what percent one number is of another?

To determine what percent one number (A) is of another (B), divide the part (A) by the whole (B) and multiply by 100.

For instance, to see what percent 5 is of 25:

1. Divide 5 by 25 = 0.2.
2. Multiply 0.2 × 100 = 20%.

So, 5 is 20% of 25. Use the What Percent Is A of B tool to get the exact percentage ratio immediately.