Discount Calculator
Calculate discounts, sale prices, and stacked savings with step-by-step breakdowns.
Discount calculator
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How It Works
To calculate the final price, multiply the original price by (1 − discount%/100). A $100 item at 25% off costs $100 × 0.75 = $75. The savings is $25.
To find the discount percentage when you know the original and sale prices, subtract the sale price from the original, divide by the original, and multiply by 100. If an item was $80 and is now $60, the discount is ($80 − $60) / $80 × 100 = 25%.
Stacked discounts are applied sequentially, not added together. A 20% discount followed by a 10% discount is NOT the same as 30% off. First, 20% off $100 = $80, then 10% off $80 = $72. The total effective discount is 28%, not 30%.
Tips & Best Practices
Frequently Asked Questions
How do I calculate a percentage discount?
Multiply the original price by the discount percentage divided by 100. For example, 30% off $80: $80 × 0.30 = $24 discount, so the final price is $80 − $24 = $56.
What are stacked discounts?
Stacked discounts are multiple discounts applied one after another. Each discount applies to the price after the previous discount, not the original price. For example, 20% off then 15% off $100: first $100 × 0.80 = $80, then $80 × 0.85 = $68.
Is 20% + 10% the same as 30% off?
No. Stacked discounts of 20% then 10% give an effective discount of 28% (not 30%). This is because the second discount applies to the already-reduced price, not the original.
How do I find the original price from the sale price?
Divide the sale price by (1 − discount%/100). For example, if an item is $60 after a 25% discount: $60 / 0.75 = $80 original price.
How do I compare two different discount offers?
Calculate the final price for each offer. For example, '30% off' vs '20% off + extra 15% off': 30% off $100 = $70; 20% then 15% off $100 = $68. The stacked discount is better in this case.