Percentage Calculator
Solve any percentage question — X% of Y, what % X is of Y, X is Y% of what, increase or decrease by %, % change, % difference and percentage points — with the working shown.
- Your data never leaves your device
- 100% free
- No sign-up
- Works offline after first load
How to calculate percentages
- Choose the kind of question at the top, e.g. “X% of Y” or “% change”.
- Type the numbers — the answer updates as you type.
- Read the answer in a sentence with the formula and working; copy or share it.
About Percentage Calculator
Get any percentage answer instantly and see how it was worked out. Seven calculators in one cover everyday questions: a percentage of a number, what percentage one number is of another, the whole from a part, adding or taking off a percentage, the change between two numbers, the difference between two values and percentage points.
Every answer comes as a clear sentence with the formula and your numbers plugged in, so it is easy to check, learn from and copy.
Good for
- Marks, scores and exam percentages
- Price rises, discounts and commissions
- Statistics and reports
Tip: Use “Increase / decrease” to see the % needed to get back to the start — it is not the same %.
Frequently asked questions
How do I calculate a percentage of a number?
Divide the percentage by 100 and multiply: 15% of 240 = 0.15 × 240 = 36.
How do I find what percent one number is of another?
Divide the part by the whole and multiply by 100: 36 ÷ 240 × 100 = 15%.
What is the difference between % change and % difference?
% change compares a new value with an old one (direction matters). % difference compares two values symmetrically, dividing by their average.
What are percentage points?
The simple difference between two percentages: from 4% to 5% is +1 percentage point, which is a 25% relative increase.
Can I save or share a calculation?
Yes — click Share to copy a link that opens the calculator with your numbers, Print / PDF to save the results, or open History to go back to recent calculations.
Is my data stored or sent anywhere?
No. Everything is calculated in your browser. Your recent calculations are kept only in this browser (History), and a shared link contains just the numbers you entered.