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Find X% of a number, work out what percentage one number is of another, or calculate the percentage change between two values.
Result
0.00% of 0.00 is
0.00
Quick Reference — Common Percentages
| Percentage | of $50.00 | of $100.00 | of $500.00 | of $1,000.00 |
|---|---|---|---|---|
| 5% | $2.50 | $5.00 | $25.00 | $50.00 |
| 10% | $5.00 | $10.00 | $50.00 | $100.00 |
| 15% | $7.50 | $15.00 | $75.00 | $150.00 |
| 20% | $10.00 | $20.00 | $100.00 | $200.00 |
| 25% | $12.50 | $25.00 | $125.00 | $250.00 |
| 33.33% | $16.67 | $33.33 | $166.65 | $333.30 |
| 50% | $25.00 | $50.00 | $250.00 | $500.00 |
| 75% | $37.50 | $75.00 | $375.00 | $750.00 |
| 100% | $50.00 | $100.00 | $500.00 | $1,000.00 |
Click any row to load the percentage into the calculator.
How percentages work
A percentage is a fraction of 100. Saying "25%" means 25 out of every 100, or one quarter. To convert a percentage to a decimal, divide by 100 (e.g. 25% = 0.25). To convert a decimal back to a percentage, multiply by 100.
When are percentages used?
Percentages appear everywhere — discounts and markups in retail, tax rates (like Australia's 10% GST), interest rates on loans and savings, statistical data, tipping, and comparing proportions across different-sized groups.
Common percentage formulas
X% of Y:
(X / 100) × Y = result
X is what % of Y:
(X / Y) × 100 = %
% change:
(new − old) / |old| × 100
Percentage tricks
X% of Y = Y% of X
So 8% of 50 is the same as 50% of 8 = 4. Pick whichever is easier to calculate in your head.
Finding 15%
Find 10% (move the decimal point one place left), then find 5% (half of 10%), and add them together. E.g. 15% of $80 = $8 + $4 = $12.
Quick doubles
25% = divide by 4. 50% = divide by 2. 75% = subtract 25% from the whole. 33.3% = divide by 3.
To find X% of a number, convert the percentage to a decimal by dividing by 100, then multiply by the number. For example, 15% of 200 is 0.15 × 200 = 30. To find what percentage one number is of another, divide the part by the whole and multiply by 100. For instance, 45 out of 180 is (45 ÷ 180) × 100 = 25%.
Percentage change measures how much a value has increased or decreased relative to its original amount. The formula is ((new value − old value) ÷ |old value|) × 100. A positive result indicates an increase, while a negative result indicates a decrease. This is commonly used to track price changes, investment returns, and performance metrics.