Count the category and the total
If 12 of 40 survey responses choose option A, the frequency for A is 12 and the total is 40.
Write a fraction, decimal or percentage
Relative frequency = 12/40 = 0.3 = 30%. Multiply the decimal by 100 to turn it into a percentage.
Check the full table
For mutually exclusive categories covering all observations, the relative frequencies add to 1, or 100%. Small discrepancies may come from rounding each row.