Percentage Calculator — 4 Calculators in One
Calculate percentages instantly: X% of Y, percentage change, tip calculator and more. Four calculators in one free tool.
What is X% of Y?
X is what % of Y?
Percentage Change
Tip Calculator
Common Percentages Reference
| Percentage | Fraction | Decimal | Of 100 | Of 1000 |
|---|---|---|---|---|
| 5% | 1/20 | 0.05 | 5 | 50 |
| 10% | 1/10 | 0.10 | 10 | 100 |
| 12.5% | 1/8 | 0.13 | 12.5 | 125 |
| 15% | 3/20 | 0.15 | 15 | 150 |
| 20% | 1/5 | 0.20 | 20 | 200 |
| 25% | 1/4 | 0.25 | 25 | 250 |
| 33.33% | 1/3 | 0.3333 | 33.33 | 333.3 |
| 50% | 1/2 | 0.50 | 50 | 500 |
| 75% | 3/4 | 0.75 | 75 | 750 |
| 100% | 1/1 | 1.00 | 100 | 1000 |
Click a row to use that percentage in the calculator above.
Percentage Formulas
What is X% of Y?
Result = (X / 100) × Y
X is what % of Y?
Result = (X / Y) × 100
Percentage Change
Change = ((New - Old) / Old) × 100
Tip Calculator
Total = Bill × (1 + Tip% / 100)
Calculate percentages — four ways
This tool combines the four most common percentage calculations: what is X% of Y, what percentage X is of Y, percentage change between two values, and a tip calculator. Instant results as you type.
Understanding percentages is essential for everyday calculations — from shopping discounts and sales tax to investment returns and grade calculations. This tool covers the four most common percentage scenarios: finding X% of a number, determining what percentage one number is of another, calculating percentage change, and computing tips.
All calculations happen instantly in your browser with no data sent to any server. The reference table shows common percentage-to-fraction conversions, and you can click any row to quickly use that percentage. Perfect for students, shoppers, investors, and anyone working with numbers.
How the Percentage Calculator Works
- Choose the type of calculation: percentage of a number, percentage change, or what percentage one number is of another
- Enter your values in the input fields
- The result is calculated instantly as you type
- Use the clear button to start a new calculation
Common Percentage Calculations Explained
Percentage calculations come up frequently in everyday life: discounts while shopping, tax calculations, grade scoring, and tip calculations. To find X% of a number, multiply the number by X/100. To find the percentage change between two values, divide the difference by the original value and multiply by 100. A percentage increase from 50 to 75 is 50%, not 25%.
When to Use a Percentage Calculator
Use this calculator whenever you need quick, error-free percentage math. Common scenarios include calculating sale discounts while shopping (e.g., 30% off a $89 item), determining tax amounts on invoices, computing grade percentages for school or university, figuring out tip amounts at restaurants, and analyzing percentage changes in business metrics like revenue growth or stock price movements.
Common Use Cases
- •Calculate sale discounts while shopping (e.g., 30% off a $89 item)
- •Determine tax amounts on invoices and purchases
- •Compute grade percentages for school assignments and exams
- •Calculate tip amounts at restaurants using the built-in tip calculator
- •Analyze percentage changes in business metrics like revenue growth or stock prices
Expert Tips
- ✱For percentage change, always divide by the original value — dividing by the new value is a common error that gives wrong results
- ✱To reverse a discount (find the original price), divide the discounted price by (1 - discount rate as decimal)
- ✱Remember that percentage points and percentages are different: going from 3% to 5% is a 2 percentage point increase but a 66.7% relative increase
Frequently Asked Questions
- Multiply the number by the percentage and divide by 100. For example, 25% of 200 is (25 / 100) x 200 = 50. This calculator does the math instantly as you type.
- Percentage change = ((new value - old value) / old value) x 100. For example, if a price goes from $80 to $100, the percentage change is ((100 - 80) / 80) x 100 = 25% increase.
- A percentage point is an absolute difference between two percentages. If interest rates rise from 3% to 5%, that is a 2 percentage point increase, but a 66.7% relative increase. This distinction matters in finance, politics, and statistics.
- Yes, completely free. The calculator runs entirely in your browser — no data is sent to any server, and there are no ads.
- Yes. To find a discount, use the 'X% of Y' calculator — for example, 20% of $150 gives you $30 (the discount amount). For sales tax, enter the tax rate and pre-tax price to get the tax amount. The tip calculator section also handles restaurant tips.
How do I calculate a percentage of a number?▾
What is the formula for percentage change?▾
What is the difference between percentage points and percent?▾
Is this percentage calculator free to use?▾
Can I use this for calculating discounts and sales tax?▾
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