Student
Percentage Calculator
Three modes: find a percentage of a number, express one number as a percentage of another, or calculate a % change.
How it works
Mode 1 (X% of Y): result = X ÷ 100 × Y. Mode 2 (X as % of Y): result = X ÷ Y × 100. Mode 3 (% change): result = (Y − X) ÷ X × 100. A positive result is an increase; negative is a decrease.
Frequently asked questions
How do I calculate a percentage increase?
Subtract the original from the new value, divide by the original, multiply by 100. Use Mode 3 above.
What is 20% of 350?
20% of 350 = 70. Enter 20 and 350 in Mode 1 to confirm.