← All Calculators

Percentage Calculator

Solve any percentage problem with three calculator types.

What is X% of Y?

X is what % of Y?

Percentage Change

Percentage formulas

P% of XP100 × X
What percent is A of BAB × 100
Percent changenew − oldold × 100
Original before a % increasenew1 + P/100

Worked examples

  1. What is 15% of 80?

    1. 0.15 × 80

    Answer: 12

  2. You scored 45 out of 60. What percent is that?

    1. 4560 × 100

    Answer: 75%

  3. A price rises from $50 to $65. What is the percent change?

    1. 65 − 5050 × 100 = 1550 × 100

    Answer: +30%

  4. After a 20% raise your salary is $60,000. What was it before?

    1. 60,0001.20

    Answer: $50,000

Tips & common mistakes

  • A 20% rise followed by a 20% fall does not get you back: 1.2 × 0.8 = 0.96, a 4% loss.
  • "Percent" and "percentage points" differ: 5% → 7% is +2 points but +40%.