Percentage Calculator
Calculate percentages, find what percent a number is of another, and compute percent change instantly.
Percentage calculator handles four common percent problems in one place. Find what X% of Y equals. Calculate what percent one number is of another. Compute the percentage change between two values. Apply a percentage increase or decrease to any number. Results appear instantly as you type. All calculations run in your browser with no signup required.
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Frequently Asked Questions
- How do I calculate percentage of a number?
- Multiply the number by the percentage and divide by 100. For example, 15% of 800 equals 800 × 15 / 100 = 120. Use the "X% of Y" tab. Enter 15 as the percentage and 800 as the value.
- How to calculate percentage increase?
- Percentage increase = ((New Value - Old Value) / Old Value) × 100. If a salary goes from ₹30,000 to ₹36,000, the increase is (6,000 / 30,000) × 100 = 20%. Use the "% Change" tab and enter the old and new values.
- How to find what percent one number is of another?
- Divide the part by the whole and multiply by 100. If you scored 45 out of 60, the percentage is (45 / 60) × 100 = 75%. Use the "What % of Y" tab and enter 45 as X and 60 as Y.
- How to calculate percentage decrease?
- Percentage decrease = ((Old Value - New Value) / Old Value) × 100. If a price drops from ₹500 to ₹425, the decrease is (75 / 500) × 100 = 15%. Enter 500 as the old value and 425 as the new value in the "% Change" tab.
- How to apply a 10% discount to a price?
- Use the "Increase/Decrease" tab. Enter the original price, set 10 as the percentage, and select "decrease". For a ₹1,200 item with 10% off, the new price is ₹1,080 and the discount is ₹120.
- What is the formula for percentage change?
- Percentage change = ((New - Old) / |Old|) × 100. A positive result means an increase; a negative result means a decrease. A stock moving from ₹150 to ₹135 gives (135 - 150) / 150 × 100 = -10%. That is a 10% drop.
What is Percentage Calculator?
Percentage calculator solves four common percentage problems from a single page. Enter any two numbers and the result appears instantly. Four modes handle the most frequent questions. Find a percentage of a number. Determine what percentage one value is of another. Calculate how much something changed, or apply a rate to a new value.
All calculation runs in your browser. No data is sent to any server.
How does it work?
Mode 1, X% of Y: The formula is Y × X / 100. Enter 18 as the percentage and 5000 as the value. The result is 900, the GST amount at 18% on a ₹5,000 invoice.
Mode 2, What percent is X of Y: The formula is (X / Y) × 100. Enter 360 as X and 1200 as Y. The answer is 30%. Useful for exam scores, market share, and completion rates.
Mode 3, Percentage change: The formula is ((New - Old) / |Old|) × 100. A positive result shows an increase; a negative result shows a decrease. Enter last month's sales of ₹80,000 and this month's ₹92,000 to get a 15% growth figure.
Mode 4, Percentage increase/decrease: The formula is Original × (1 ± Rate/100). Enter 2500 and 12% for an increase to get ₹2,800. Select decrease for the same inputs to get ₹2,200. Useful for discounts, dearness allowance hikes, and price revisions.
When should you use Percentage Calculator?
Tax calculations use percentages at every step. GST runs at 5%, 12%, 18%, or 28% depending on the product category. TDS rates vary by income type. Section 80C deductions cover up to ₹1.5 lakh of eligible investments. A percentage calculator makes these steps faster and less error-prone than mental math.
Shopping discounts and sale prices are stated as percentages. A 25% discount on a ₹3,600 item saves ₹900. The net price becomes ₹2,700. Comparing two discounts, say 30% off versus a flat ₹1,000 off, needs the same calculation with different inputs.
Investment returns, salary hikes, and inflation adjustments are all expressed as percentages. Apply each rate and compare the results to see which figure grows faster.
Board exam results and competitive entrance test scores come as marks, not percentages. Converting 312 out of 500 to 62.4% using the "What %" mode takes seconds. Cut-off percentiles for UPSC, JEE, and NEET are expressed the same way.
Tips to get the best results
- For GST calculations, use Mode 1 to find the tax on a base price. Enter the GST rate as X and the base price as Y. The result is the tax amount, not the total. Add the result to Y for the final invoice figure.
- Use Mode 3 to compare figures across time periods. Enter the earlier figure as "old" and the current figure as "new" to see month-over-month or year-over-year growth.
- For salary hike offers, use Mode 4 to find the new CTC. Then switch to Mode 3 to verify the percentage increase matches the offer letter.
- For mark-to-percentage conversion, always divide by the maximum marks possible. A student who scored 87 out of 120 is at 72.5%, not 87%.