Percentage Calculator
Calculate percentages, percentage change, and marks to percentage
Choose Calculation Mode
—
—
—
How to Use
- Select the calculation mode using the tabs: "X% of Y", "X is what % of Y", "Percentage Change", or "Marks to %".
- Enter the values in the fields provided for your chosen mode.
- The result appears instantly below the inputs.
- The formula used is shown alongside the result so you understand the calculation.
Percentage Calculation Modes
1. What is X% of Y?
Use this to find a percentage of any number. Example: What is 15% of ₹2,500? = 15/100 × 2,500 = ₹375. Useful for calculating discounts, tips, or GST amounts.
2. X is what % of Y?
Find what percentage one number is of another. Example: 45 marks out of 80 = 45/80 × 100 = 56.25%. Useful for calculating test scores or completion rates.
3. Percentage Change
% Change = (New Value − Old Value) / Old Value × 100
Positive = increase, Negative = decrease. Example: Price went from ₹200 to ₹250 → (250−200)/200×100 = +25% increase.
4. Marks to Percentage
Total marks obtained ÷ Maximum marks × 100. Example: 435 out of 500 = 435/500 × 100 = 87%.
Quick Reference
| To find | Formula |
|---|---|
| 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 an absolute measure — your score as a fraction of total marks × 100. Percentile is a relative rank — it shows what percentage of test-takers scored below you. For example, scoring 75% in an exam might put you at the 60th percentile if most students scored well. Competitive exams like JEE, CAT, and NEET report percentile, not percentage.
Discount amount = (Discount % ÷ 100) × Original Price. Final price = Original Price − Discount Amount. Example: 30% off ₹1,500 = 0.30 × 1,500 = ₹450 discount → Final price = ₹1,050. Our calculator's 'X% of Y' mode handles this directly.
Use the Percentage Change mode: enter old salary as 'Old Value' and new salary as 'New Value'. Formula: (New − Old) / Old × 100. Example: salary went from ₹40,000 to ₹46,000 → (46,000 − 40,000) / 40,000 × 100 = 15% increase.
Passing percentage varies by board and institution: CBSE board exams require 33% (or 33 marks out of 100) per subject. Most state boards: 35%. Undergraduate courses: 40–50% per subject (varies by university). Some professional courses (medical, law) require 50% per subject with an overall minimum. Always check your specific institution's requirements.