What is X% of Y?
Example: What is 20% of 150?
%
of
Result
—
Formula: (percent ÷ 100) × number
Calculators
Free Percentage Calculator
Calculate common percentages quickly: find a percent of a number, see what percent one number is of another, or measure percentage increase and decrease.
X is what percent of Y?
Example: 30 is what percent of 120?
of
Result
—
Formula: (part ÷ total) × 100
Percentage increase or decrease
Compare an original value with a new value to see how much it changed.
to
Result
—
Enter both values
Formula: ((new − original) ÷ |original|) × 100
Private by design: calculations happen in your browser. Nothing you enter is submitted to SDS.
Quick Everyday Math
Three common percentage calculations in one place.
Use it for discounts, budgets, price changes, business numbers, schoolwork, or any time you need a quick percentage answer.