Free Tool
Every everyday percentage in one place — a percent of a number, one number as a percent of another, percentage change, and quick tips.
A percentage is just a fraction out of 100. “Percent” literally means “per hundred.” Once that clicks, every percentage question becomes the same two operations: to find a percent of something you multiply, and to find what percent one thing is of another you divide. Everything above — discounts, tips, markups, changes — is one of those two moves.
Multiply the number by the percentage divided by 100. For example, 20% of 150 is 150 × 0.20 = 30. The first tool above does this for you — enter the percentage and the number.
Divide the part by the whole and multiply by 100. For example, 30 out of 120 is (30 ÷ 120) × 100 = 25%. The second tool handles this directly.
Subtract the old value from the new value, divide by the old value, and multiply by 100. Going from 80 to 100 is ((100 − 80) ÷ 80) × 100 = a 25% increase. A negative result means a decrease.
Multiply the bill by the tip percentage divided by 100. A 18% tip on a $60 bill is $60 × 0.18 = $10.80, making the total $70.80. The tip tool above shows both the tip amount and the total.
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