Percentage Calculator
Instantly calculate percentages in plain English.
Type into any sentence below — results appear instantly.
What is % of ?
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is what % of ?
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is % of what?
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How Percentage Calculations Work
What is X% of Y? — Formula & Examples
Answers: "What is 20% of 150?"
Result = (P ÷ 100) × V
(20 ÷ 100) × 150 = 30
(20 ÷ 100) × 150 = 30
Common uses: sale discounts, tips, tax, commission.
- 15% tip on $80 = (15÷100)×80 = $12
- 20% VAT on €100 = €20
X is what % of Y? — Formula & Examples
Answers: "30 is what percent of 150?"
% = (Part ÷ Total) × 100
(30 ÷ 150) × 100 = 20%
(30 ÷ 150) × 100 = 20%
- 45/60 test score = 75%
- €350 of €1,400 budget = 25%
X is Y% of what? — Formula & Examples
Answers: "30 is 20% of what?"
Total = Part ÷ (P ÷ 100)
30 ÷ 0.2 = 150
30 ÷ 0.2 = 150
- $12 tip is 15% of what bill? → $80
- €45 is 30% of what? → €150
Percentage Increase / Decrease — Formula & Examples
Increase: V × (1 + P/100)
Decrease: V × (1 − P/100)
200 × 1.15 = 230 (+15%)
200 × 0.85 = 170 (−15%)
Decrease: V × (1 − P/100)
200 × 1.15 = 230 (+15%)
200 × 0.85 = 170 (−15%)
- £35,000 + 8% raise = £37,800
- €120 − 25% sale = €90
- Adding 20% UK VAT: price × 1.20
Percentage Difference / Change — Formula & Examples
% Change = ((New − Old) ÷ |Old|) × 100
80→100: ((100−80)÷80)×100 = +25%
100→80: ((80−100)÷100)×100 = −20%
80→100: ((100−80)÷80)×100 = +25%
100→80: ((80−100)÷100)×100 = −20%
Note: a 25% gain then a 20% loss returns to the original — percentages are not symmetric!