Percentage Calculator – Calculate Any Percentage Instantly
This free percentage calculator covers 5 types of percentage calculations — finding a percentage of a number, what percentage one number is of another, percentage increase or decrease, discount prices and exam marks percentage. All calculations run instantly in your browser with no signup required.
What is a Percentage?
A percentage is a way of expressing a number as a fraction of 100. The word comes from the Latin per centum, meaning "per hundred." Percentages are used everywhere — exam scores, tax rates, discounts, interest rates and data analysis.
The 5 Calculations This Tool Covers
1. What is X% of Y?
Result = (X ÷ 100) × Y | Example: 20% of 500 = 100
Use this for GST on a price, salary hike value, tip amount or discount amount.
2. X is What Percentage of Y?
Percentage = (X ÷ Y) × 100 | Example: 75 of 300 = 25%
Use this to find exam percentage, market share or budget utilisation.
3. Percentage Change
Change% = ((New − Old) ÷ Old) × 100 | Example: 800→1000 = +25%
Use this for price changes, salary hikes, stock returns or growth rates.
4. Discount Calculator
Sale Price = Original × (1 − Discount% ÷ 100) | Example: ₹1999 at 30% off = ₹1399.30
Instantly find what you actually pay after a discount during sales on Amazon, Flipkart or any store.
5. Exam Marks Percentage
Percentage = (Marks Obtained ÷ Total Marks) × 100 | Example: 450/600 = 75%
Use for board exams, semester results, competitive tests or any scored assessment.
Common Percentage Examples
| Calculation | Formula | Result |
|---|
| 18% GST on ₹5,000 | (18 ÷ 100) × 5000 | ₹900 |
| 40% off ₹2,499 | 2499 × (1 − 0.40) | ₹1,499.40 |
| Salary ₹50,000 → ₹60,000 | ((60000−50000) ÷ 50000) × 100 | +20% |
| Exam: 378 out of 500 | (378 ÷ 500) × 100 | 75.6% |
| 25 is what % of 80? | (25 ÷ 80) × 100 | 31.25% |
| 10% TDS on ₹25,000 | (10 ÷ 100) × 25000 | ₹2,500 |
💡 Quick mental maths: To find 10% of any number, move the decimal one place left. 10% of ₹3,500 = ₹350. For 5%, halve it = ₹175. For 20%, double it = ₹700.
Frequently Asked Questions
How do I calculate percentage of a number?Multiply the number by the percentage and divide by 100. Example: 20% of 500 = (500 × 20) ÷ 100 = 100. Or multiply by the decimal: 500 × 0.20 = 100.
How do I calculate percentage increase?Percentage increase = ((New Value − Old Value) ÷ Old Value) × 100. Salary from ₹40,000 to ₹48,000 = ((48000−40000) ÷ 40000) × 100 = 20%.
How do I calculate my exam percentage?Divide marks obtained by total marks and multiply by 100. Example: 368 out of 500 = (368 ÷ 500) × 100 = 73.6%.
How do I find the original price before discount?Original Price = Sale Price ÷ (1 − Discount% ÷ 100). Example: Paid ₹700 after 30% off → original = 700 ÷ 0.70 = ₹1,000.
What is 1% of 1 crore?1% of 1,00,00,000 = ₹1,00,000 (one lakh).