Percentage Calculator Free percentage calculator. What is the % of a number? Enter a number (**part**): Enter the total (**whole**): Calculate Percentage The percentage formula used in our free calculator is:Percentage = (Part / Whole) x 100Here's what each part represents:Part: This is the specific value you're interested in, like website visitors who converted into paying customers.Whole: This is the total number you're comparing it to, such as your total website traffic.By plugging these values into the formula, you get a percentage that tells you a much more meaningful story.