Discount & Markup Calculator
Calculate discounted price, discount percentage, original price or markup and margin. Free online discount and markup calculator for buyers and sellers.
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Calculator · Maths
Percentage Calculator
The percentage calculator covers the four most common percentage problems. Choose the mode that matches your task: • What percent: calculates what percentage A is of B (A/B × 100%) • Percent of a number: calculates A% of B (B × A / 100) • Percentage change: calculates the % change from A to B ((B−A)/|A| × 100%) • Add a percent: calculates A increased by B% (A × (1 + B/100)) Useful for calculating discounts, salary increases, price changes, mixture ratios and hundreds of everyday calculations.
How to use the percentage calculator
1. Select the calculation mode. 2. Enter values A and B according to the chosen mode: - WHAT PERCENT: A = part, B = whole - PERCENT OF A NUMBER: A = the percentage (e.g. 20), B = the base number - PERCENTAGE CHANGE: A = starting value, B = ending value - ADD PERCENT: A = base value, B = percent to add (negative = subtract) 3. Click Calculate — the result appears instantly.
Example: percentage calculations step by step
1. What percent: 25 is (25/200)×100 = 12.5% of 200. 2. Percent of a number: 20% of 500 = 500×20/100 = 100. 3. Percentage change: from 100 to 150 → (150−100)/100×100 = +50%. From 200 to 150
−25%. 4. Add percent: 500 + 20% = 600. Subtract: 1000 − 15% = 850.
Frequently asked questions
How do I calculate what percent A is of B?
Formula: (A / B) × 100%. Example: 25 is (25/200) × 100 = 12.5% of 200. Use the 'What percent?' mode: enter the part as A and the whole as B.
How do I find a percentage of a number?
Formula: (A% of B) = B × A / 100. Example: 20% of 500 = 500 × 20 / 100 = 100. Use the 'Percent of a number' mode: A is the percentage, B is the base number.
How do I calculate percentage change?
Percentage change = ((end_value − start_value) / |start_value|) × 100%. An increase from 100 to 150 is +50%. A decrease from 200 to 150 is (150−200)/200 × 100 = −25%.
How do I add or subtract a percentage from a number?
Adding p% to A: result = A × (1 + p/100). Subtracting p%: result = A × (1 − p/100), equivalent to adding −p%. Example: 500 + 20% = 600. Subtracting: 500 − 15% = 425.
What is the difference between a percentage point and a percent?
A percentage point (pp) is the absolute difference between two percentages. Example: a rate rising from 2% to 5% increases by 3 percentage points but by 150% in relative terms. Confusing the two leads to major analytical errors.
How do I calculate a price after a discount?
Price after discount = original_price × (1 − discount/100). Example: item at 120 PLN with 25% off: 120 × 0.75 = 90 PLN. You can use the 'Add percent' mode with a negative percentage (−25).
How do I find the original price before a discount?
Original price = discounted_price / (1 − discount/100). Example: item costs 90 PLN after a 25% discount: 90 / 0.75 = 120 PLN. This is called finding the base value.
How do I calculate the profit margin?
Margin = (selling_price − cost) / selling_price × 100%. This differs from markup: markup = (price − cost) / cost × 100%. Example: cost 80, sell 100 → margin = 20%, markup = 25%.
How do I find by how much percent one number exceeds another?
Use the 'Percentage change' mode. Enter A as the smaller number and B as the larger. The result is the percentage increase. Example: B=150 vs A=100 → 50%. The number 150 is 50% larger than 100.
What are typical uses of a percentage calculator?
Everyday uses include: calculating store discounts, salary raise percentages, stock or property price changes, ingredient ratios in recipes, splitting bills, interest rates, VAT calculations, exam scores, and much more.
Indicative result
Results are for informational purposes. The calculator uses standard mathematical formulas. Results are rounded to double-precision floating point.
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