Percentage Calculator
Calculate percentages: X% of Y, increase, decrease, difference, discount, tax, tip and commission.
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Percentage Formulas
X% of Y = X ÷ 100 × Y (20% of 500 = 100)
Percentage Increase = (New − Old) ÷ Old × 100% (100 → 150 = 50% increase)
Percentage Decrease = (Old − New) ÷ Old × 100% (100 → 80 = 20% decrease)
Percentage Difference = |A − B| ÷ average(A, B) × 100%
Examples
- What is 20% of 500? → 0.20 × 500 = 100
- From 100 to 150 → (150−100)÷100 = 50% increase
- From 100 to 80 → (100−80)÷100 = 20% decrease
Frequently Asked Questions
Divide the percentage by 100 and multiply by the number. 20% of 500 is 0.20 × 500 = 100.
Subtract the old value from the new value, divide by the old value, then multiply by 100. From 100 to 150: (150−100)÷100×100 = 50% increase.
The absolute difference between two values divided by their average, times 100. It measures relative difference without direction.
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