Percentage Calculator
🔒 In your browserWhat is X% of Y, X is what % of Y, and X is Y% of what.
How it works
Solve the three everyday percentage questions: what is X% of Y, X is what percent of Y, and X is Y% of what number. Pick the one you need and fill in the two values.
🔒 Calculated entirely in your browser — nothing is uploaded.
🔒 Calculated in your browser: your marks, grades and dates are never uploaded. Grading rules and conversion formulas vary by board and university, so treat the result as a reliable estimate and confirm anything official with your institution.
About the Percentage Calculator
This free percentage calculator solves the three questions that come up all the time: what is X% of Y, X is what percent of Y, and X is Y% of what number. Pick the mode and fill in two values for an instant answer.
It runs in your browser — quick, private, and no signup.
The three modes
- What is X% of Y — e.g. what is 18% of 2,500 (a discount or tax).
- X is what % of Y — e.g. 45 out of 60 marks is what percentage.
- X is Y% of what — e.g. 30 is 25% of what total.
Where each mode helps
- Shopping — 'what is X% of Y' gives the rupees off a discounted price or the GST added to a bill.
- Marks — 'X is what % of Y' turns a raw score like 45/60 into a percentage for a report card.
- Targets — 'X is Y% of what' finds the total when you only know a part and its share, e.g. a 25% deposit of ₹30,000 means a ₹1,20,000 total.
Frequently asked questions
How do I find a percentage of a number?
Multiply the number by the percentage and divide by 100 — 18% of 2,500 is 2,500 × 18 ÷ 100 = 450. The 'what is X% of Y' mode does this for you.
How do I find what percent one number is of another?
Divide the first by the second and multiply by 100 — 45 out of 60 is 45 ÷ 60 × 100 = 75%. Use the 'X is what % of Y' mode.
How do I find the whole from a percentage?
Divide the part by the percentage and multiply by 100 — if 30 is 25%, the whole is 30 ÷ 25 × 100 = 120. That's the 'X is Y% of what' mode.
How do I add or subtract a percentage?
For a 15% increase on 200, find 15% (30) and add it for 230; for a 15% discount, subtract it for 170. Use the first mode to get the percentage amount, then add or subtract.
What's the difference from percentage change?
This tool answers single-value percentage questions. To compare a before-and-after pair — like last term's marks versus this term's — use the Percentage Increase/Decrease Calculator.
Is my data uploaded?
No. Calculations run entirely in your browser.