Percentage Calculator
Three percentage questions, one calculator. Switch between modes to find the value, the percent, or the base number — all with the formula shown.
What is
%
of ?Answer
20
20% × 100 = 20
Which Mode Should I Use?
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Find Value What is X% of Y?
What is 20% off $89.99? → $89.99 × 0.20 = $18.00 savings
Sale price calculationCalculating a tip amountFinding a commission
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Find Percent X is what % of Y?
You scored 42 out of 60. → (42 ÷ 60) × 100 = 70%
Test scoresHow much of budget is spentWhat share does A have of B
🔍
Find Base X is Y% of what?
You left a $9 tip which was 18%. → $9 ÷ 0.18 = $50 bill
Reverse-engineer the original priceFind total from a percentage shareBack-calculate from tax
Common Percentage Examples
| Question | Answer |
|---|---|
| What is 10% of 200? | 20 |
| What is 25% of 80? | 20 |
| What is 15% of 60? | 9 |
| 5 is what % of 20? | 25% |
| 18 is what % of 72? | 25% |
| 30 is what % of 150? | 20% |
| 12 is 40% of what? | 30 |
| 25 is 5% of what? | 500 |
| 60 is 75% of what? | 80 |
Frequently Asked Questions
What is 20% of 80? ▼
20% of 80 = 0.20 × 80 = 16. Use the "Find Value" tab and enter 20% of 80.
How do I calculate what percentage one number is of another? ▼
Divide the part by the whole, then multiply by 100. Example: 15 is what % of 60? → (15 ÷ 60) × 100 = 25%.
30 is 15% of what number? ▼
30 ÷ (15 ÷ 100) = 30 ÷ 0.15 = 200. Use the "Find Base" tab.
What is the percentage formula? ▼
Percentage = (Part ÷ Whole) × 100. To find the part: Part = (Percentage ÷ 100) × Whole.
How do I calculate a percentage increase? ▼
Use our Percentage Change Calculator for increases and decreases. Formula: ((New − Old) ÷ Old) × 100.
What is 15% of 200? ▼
15% of 200 = 0.15 × 200 = 30.
Shopping & Math Tools
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Price Per Unit Calculator
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→ Calculate tip and split the bill between any number of people
Percentage Change Calculator
→ Find the % increase or decrease between any two values
Gross Margin Calculator
Calculate margin %, markup %, and profit from cost and price
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All calculations run entirely in your browser. No data is transmitted or stored.
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