What is the Percentage Calculator?
A percentage calculator answers the six everyday percent questions in one place. The core formula is X% of Y = X ÷ 100 × Y, so 15% of 240 = 36. Percentage change is (new − old) ÷ |old| × 100: going from 80 to 100 is a 25% increase, while going from 100 to 80 is a 20% decrease.
Choose a question type, enter X and Y, and the answer updates instantly. It also covers the reverse question (“Y is X% of what number?”) for finding an original price before a discount or tax, and percentage difference for comparing two values with no clear before and after.
How to use the Percentage Calculator
- Pick a question in What do you want to calculate?, e.g. What is X% of Y? or Percentage change from X to Y.
- Enter X and Y as the question describes (no % sign needed).
- Read the answer instantly; the change and increase/decrease modes also show the difference, multiplier or amount.
- Click Copy results or Share result to save or send the calculation.
Why use AnyShift's Percentage Calculator
Instant resultsNumbers update as you type — no submit button, no page reloads.
Formula shownEvery result shows how it was calculated so you can check the maths.
Editable assumptionsRates, fees and defaults are pre-filled but always adjustable.
Private by designCalculations run in your browser. Nothing is stored or sent.
Popular use cases
- Working out a tip, discount or sale price
- Turning a test score into a percentage of the total marks
- Measuring pay raises, rent increases and price inflation
- Adding or removing sales tax, VAT or GST
- Comparing month-over-month growth in sales, followers or traffic
The six percentage formulas with examples
| Question | Formula | Example |
|---|---|---|
| What is X% of Y? | X ÷ 100 × Y | 15% of 240 = 36 |
| X is what percent of Y? | X ÷ Y × 100 | 45 is 75% of 60 |
| Percentage change from X to Y | (Y − X) ÷ |X| × 100 | 80 → 100 = 25% increase |
| Increase / decrease Y by X% | Y × (1 ± X ÷ 100) | 50 + 20% = 60; 50 − 20% = 40 |
| Y is X% of what number? | Y ÷ (X ÷ 100) | 30 is 20% of 150 |
| Percentage difference | |X − Y| ÷ ((X + Y) ÷ 2) × 100 | 40 vs 60 = 40% |
For specific jobs, try the Discount Calculator, UK VAT Calculator or Grade Percentage Calculator.
Frequently asked questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply: 20% of 85 = 0.20 × 85 = 17. Select “What is X% of Y?” and enter X = 20 and Y = 85.
How do I work out a percentage increase?
Subtract the old value from the new one, divide by the old value and multiply by 100. A rent rise from $1,200 to $1,290 is 90 ÷ 1,200 × 100 = 7.5%.
How do I find the original price before a discount or tax?
Use “Y is X% of what number?”. After a 25% discount you pay 75%, so a $60 sale price is 75% of $80. A £120 price including 20% VAT is 120% of the net price, so enter X = 120 and Y = 120 to get £100.
What is the difference between percentage change and percentage difference?
Percentage change compares a new value with an original one, so direction matters. Percentage difference compares two values on equal terms by dividing by their average: 40 vs 60 is a 40% difference, but 40 → 60 is a 50% increase.
What is a percentage point?
The plain difference between two percentages. An interest rate rising from 4% to 5% is up 1 percentage point, which is a 25% increase in the rate itself.
How do I add 20% to a price?
Choose “Increase / decrease Y by X%”, enter X = 20 and Y = the price. The answer is Y × 1.20, and the next row shows Y × 0.80 for a 20% decrease.
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Last reviewed: Built for: United States, United Kingdom, Canada, Australia, France Part of Text & Education