What is X% of Y?
Example: 20% of 500 = 100
Result
Enter values to calculate
Percentage Calculator
Find a percent of a number, percent change, discount, markup, and profit margin instantly
Calculated locally in your browser.
X is what percent of Y?
Example: 50 is 25% of 200
Result
Enter values to calculate
Percentage increase
Example: 100 → 150 = 50% increase
Result
Enter values to calculate
Percentage decrease
Example: 200 → 150 = 25% decrease
Result
Enter values to calculate
Percentage difference
Example: 80 and 100 differ by 22.22%
Result
Enter values to calculate
Discount
Example: 20% off 1,000 = 800 (save 200)
Result
Enter values to calculate
Markup
Example: 30% markup on 100 = 130
Result
Enter values to calculate
Profit margin
Example: cost 100, sell 150 → 33.33% margin
Result
Enter values to calculate
About Percentage Calculator
Eight focused calculators for everyday percent math: what is X% of Y, X is what % of Y, increase, decrease, symmetric difference between two values, discount, markup, and profit margin. Each section updates live as you type.
How to use
- Open the calculator that matches your question and enter the requested values.
- Read the live result below the inputs; discount and markup views also show savings or selling price where relevant.
- Use Copy on a section to grab the result, or Clear to reset that section’s fields.
Definitions
- Percentage change from zero is undefined — the tool will not divide by zero.
- Percentage difference uses symmetric relative difference: absolute gap divided by the average of the two values (not the same as change from a starting value).
- Markup is added on cost to reach a selling price; profit margin expresses profit as a share of selling price — a 50% markup on 100 yields price 150, which is about a 33.33% margin.
Common uses
- Sale pricing, tips, tax estimates, and grade or score percentages.
- Comparing before/after metrics with increase or decrease calculators.
- Retail cost, markup, and margin checks without spreadsheet setup.
Tips
- Use the discount calculator when you know the list price and percent off; use markup or margin when cost and pricing strategy matter.
- Copy results into notes or invoices; Clear keeps other sections untouched.
Privacy
All arithmetic runs locally. ToolsArk does not upload your numbers.
Frequently asked questions
Common questions about the Percentage Calculator.
How do I calculate a percentage?
To find X% of Y, multiply Y by X and divide by 100. Example: 20% of 500 is 100. To find what percent X is of Y, divide X by Y and multiply by 100. Example: 50 is 25% of 200.
How do I calculate a discount?
Multiply the original price by the discount percent, then subtract that savings from the original. Example: 20% off 1,000 saves 200, so the final price is 800. ToolsArk also shows savings next to the final price.
How do I calculate percentage increase?
Subtract the original value from the new value, divide by the original, and multiply by 100. Example: 100 to 150 is a 50% increase. Percentage change from 0 is undefined.
How do I calculate percentage decrease?
Subtract the new value from the original, divide by the original, and multiply by 100. Example: 200 to 150 is a 25% decrease.
What is the difference between markup and profit margin?
Markup is the increase from cost: selling price = cost × (1 + markup%). Margin is profit as a share of selling price: (selling − cost) / selling. A 50% markup on 100 is a selling price of 150, which is a 33.33% profit margin.
How is percentage difference calculated?
ToolsArk uses the symmetric relative difference: the absolute gap divided by the average of the two values. 80 and 100 differ by 22.22%. This is not the same as percentage change from a starting value.
Does my data leave my device?
No. Every calculation runs in your browser. ToolsArk does not upload numbers or call an external math API.
Tags
calculatorpercentagemathdiscountmargin
Continue with these utilities
People frequently use these utilities together.