Percentage Calculator

Quickly calculate percentages and ratios.

What is X% of Y?

of
=
15

X is what % of Y?

of
=
40%

Percentage Calculator: Ratios & Discounts

Solve 'What is X% of Y?' or 'X is what % of Y?' instantly. Essential for students, shoppers, and finance.

The Math Behind Percentages

Percentages essentially represent fractions of 100. They are used everywhere from grading exams to calculating tax returns. Our tool offers two modes:

  • Find Percentage: "What is 20% of 150?" (Answer: 30)
  • Find Ratio: "30 is what percent of 150?" (Answer: 20%)

Frequently Asked Questions