A percentage expresses a number as a fraction of 100. Use the five calculators above to solve any percentage problem — from finding what 15% of $200 is, to calculating how much a price changed, to working out a test score.
To find X% of Y: multiply Y by X, then divide by 100. Example: 15% of 200 = (200 × 15) ÷ 100 = 30.
Common questions
For X% of Y: multiply X × Y then divide by 100. On most calculators: enter Y, press ×, enter X, press %, press =. Example: 15% of 80 → 80 × 15% = 12.
Divide the sale price by (1 − discount). If something costs $80 after a 20% discount: $80 ÷ 0.80 = $100 original price.
Going from 2% to 3% is a 1 percentage point increase, but a 50% relative increase. Percentage points are absolute; percentages are relative. This matters in finance, polls, and economics.