Percentage, Discount & Margin Calculator
Five everyday percentage calculations in one place: percent of, percent share, change, discount and margin.
How to use the Percentage
- Find the calculation you need among the five cards.
- Enter the two numbers.
- Read the answer instantly below them.
Percentages made simple
Percent means “per hundred”. Most everyday questions come down to one of a few formulas, which this page solves for you:
- X% of Y = X ÷ 100 × Y. For example, 15% of 2,000 = 300.
- X is what % of Y = X ÷ Y × 100. For example, 300 of 2,000 = 15%.
- Percentage change = (new − old) ÷ old × 100. From 800 to 1,000 is a 25% increase.
- Discount: price after discount = price × (1 − discount ÷ 100).
- Profit margin = profit ÷ selling price × 100; markup = profit ÷ cost × 100.
Margin vs markup
These are often confused. If you buy at ₹700 and sell at ₹1,000, profit is ₹300. Margin is 30% (₹300 of ₹1,000), while markup is about 42.9% (₹300 on ₹700). Shopkeepers usually price by markup; businesses report margin.
Common traps
- A 20% fall followed by a 20% rise doesn’t get you back where you started: 100 → 80 → 96.
- Two discounts don’t add up: 20% off then 10% off is 28% off, not 30%.
- Percentage points differ from percent: a rate going from 7% to 8% is up 1 percentage point, or about 14.3%.
Related calculators
For taxes on a price, use the GST calculator. Students can calculate exam scores with the marks percentage calculator or convert grades with CGPA to percentage. Everything is calculated instantly in your browser.
Quick answers
How do I find the original price before a discount? Divide the sale price by (1 − discount ÷ 100): ₹800 after 20% off was ₹1,000. How do I add 18% to a price? Multiply by 1.18, or use the GST calculator for the tax split. How do I calculate percentage change in salary? Use the increase card with old and new salary.
Frequently asked questions
How do I calculate a percentage of a number?
How do I calculate percentage increase?
What is the difference between margin and markup?
Do two discounts add up?
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