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Percentage Calculator

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Calculate percentages, percentage change, and marks to percentage

Calculation mode
15% of 200
30.00
200 + 15%
230.00
e.g. price after a markup or GST
200 − 15%
170.00
e.g. price after a discount
Formula: (15 ÷ 100) × 200 = 30.00

Runs entirely in your browser. Nothing you type or upload is sent to us or stored.

Results are for general guidance. Please check anything important before relying on it. Terms of use

How to Use

  1. Choose the calculation mode: "X% of Y", "X is what % of Y", "% change" or "Marks to %".
  2. Enter the two values for that mode.
  3. The answer updates as you type. "X% of Y" also shows Y plus and minus that percentage (handy for a markup or a discount), and "% change" tells you whether it's an increase or a decrease and by how much.
  4. The formula with your numbers appears under the answer so you can follow the working. Use copy result or share to send it.

The four ways to use this percentage calculator

1. What is X% of Y?

This finds a percentage of a number. What is 15% of ₹2,500? It's 15/100 × 2,500 = ₹375. You'd use it for a discount, a tip or a GST amount.

2. X is what % of Y?

This tells you what share one number is of another. 45 marks out of 80 is 45/80 × 100 = 56.25%. Handy for test scores, or how much of a target you've reached.

3. Percentage change

% Change = (New Value − Old Value) / Old Value × 100

A positive answer is an increase and a negative one is a decrease. If a price goes from ₹200 to ₹250, that's (250−200)/200×100 = +25%, an increase.

4. Marks to percentage

Divide the marks you got by the maximum marks and multiply by 100. 435 out of 500 is 435/500 × 100 = 87%.

Quick reference

To findFormula
X% of Y(X ÷ 100) × Y
What % is X of Y(X ÷ Y) × 100
% Increase/Decrease((New − Old) ÷ Old) × 100
Marks %(Obtained ÷ Total) × 100

Frequently Asked Questions

Percentage is your own score; percentile is your rank against others. Percentage is your marks as a share of the total, × 100. Percentile tells you what percentage of test-takers scored below you. So 75% in an exam might put you at the 60th percentile if most students did well. Competitive exams like JEE, CAT and NEET report percentile, not percentage.

Multiply the price by the discount % and divide by 100; that's the discount. Take it off the original price to get what you pay. For 30% off ₹1,500, the discount is 0.30 × 1,500 = ₹450, so you pay ₹1,050. The calculator's 'X% of Y' mode does this directly.

Use the % Change mode. Enter your old salary as the Old value and your new salary as the New value. The formula is (New − Old) / Old × 100. If your salary went from ₹40,000 to ₹46,000, that's (46,000 − 40,000) / 40,000 × 100 = a 15% increase.

Usually 33–35% in school, and 40–50% in college. CBSE board exams need 33% (33 marks out of 100) in each subject, and most state boards need 35%. Undergraduate courses usually ask for 40–50% per subject, depending on the university. Some professional courses (medical, law) need 50% per subject plus an overall minimum. Check the rules of your own board or college.