Useful scenarios
- Discounts, markups, taxes and tips.
- Comparing two values over time.
- Checking increases, decreases and original prices.
Choose a calculation
Select the percentage type, enter the numbers and get the result instantly.
Percentages, discounts, increases and changes.
Percentage Calculator
Calculate common percentages: what a percentage of a number is, what percentage one value represents, discounts, increases and percentage changes.
Simple math tool. It does not replace financial or professional advice.
How to use the percentage calculator
This calculator helps solve common percentage operations without writing formulas manually. You can calculate a percentage of a value, find what percentage one number represents of another, add or subtract percentages and measure changes between two values.
It is useful for discounts, increases, simple comparisons, price changes, quantity changes or any everyday situation where a percentage appears. Calculations run directly in your browser.
Available calculation types
- X% of Y: calculates how much a percentage represents when applied to a number.
- X is what % of Y: shows what percentage one value represents of another.
- Add percentage: adds a percentage to a base number.
- Subtract / discount: subtracts a percentage from a base number.
- Percentage change: calculates how much a value increased or decreased between two moments.
- Percentage difference: compares two values using their average as reference.
Important
This is a math and informational tool. It can help you check numbers, but it should not be used as financial, accounting, tax or professional advice.
Related guide
How to Calculate Percentages Correctly
Learn the formulas for percentages, discounts, increases, percentage changes, differences and original values.
- Percentage of an amount.
- Increases and discounts.
- Percentage change and difference.
- Successive percentages and common mistakes.
Percentages are easier when the question is separated from the formula
Percentage problems often feel confusing because different questions sound similar but use different formulas. βWhat is 20% of 150?β, β150 is what percentage of 600?β, and βwhat is the percentage change from 80 to 100?β are related, but they are not the same operation.
This calculator separates common percentage questions into clear inputs. That helps avoid one of the most frequent mistakes: using the discount formula when the real problem is a change, or comparing two numbers in the wrong direction.
Avoid mistakes
- Identify which value is the base before calculating.
- For percentage change, direction matters: old to new is not the same as new to old.
- A 50% decrease followed by a 50% increase does not return to the original value.
Result checking
- Round only at the end when precision matters.
- Use the explanation next to the result to understand the operation.
- For financial decisions, double-check important numbers in the original source.
Frequently asked questions
What can I calculate with this percentage calculator?
You can calculate what a percentage of a number is, what percentage one value represents of another, increases, discounts, decreases and percentage changes.
Can it calculate discounts?
Yes. You can enter the original price and the discount percentage to get the final price.
Are calculations saved?
No. Calculations run directly in your browser and you do not need to create an account.
Is this a financial tool?
No. It is a simple math calculator. It can help with percentages, but it does not replace financial, accounting or professional advice.