Percentage Calculator

Calculate percentages, increases, decreases, and tips

Percentage Formula Reference

Common Formulas

  • X% of Y: (X ÷ 100) × Y
  • X is what % of Y: (X ÷ Y) × 100
  • Percentage change: ((New - Old) ÷ |Old|) × 100

Common Percentages

10% = 1/10
20% = 1/5
25% = 1/4
33.33% = 1/3
50% = 1/2
66.67% = 2/3