Discount Calculator
Calculate the sale price and savings for any discount. Stack multiple discounts to find the true effective percentage.
Enter a price and discount to calculate.
Final price
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You save
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Effective off
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Original
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Savings
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Final
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Stacked discount breakdown
How it works
How discounts are calculated.
- 01
Calculate savings
Savings = Original price × (Discount % ÷ 100). For 20% off $80: Savings = $80 × 0.20 = $16.
- 02
Calculate final price
Final price = Original price − Savings. For $80 with $16 savings: Final = $80 − $16 = $64.
- 03
Stacked discounts
Each discount applies to the reduced price, not the original. A 20% then 10% discount on $100: first → $80, then → $72. Effective discount = 28%, not 30%.
FAQ
Frequently asked questions.
How is a discount calculated?
Savings = Original price × (Discount % ÷ 100). Final price = Original price − Savings. For example, 20% off $80: Savings = $80 × 0.20 = $16. Final = $80 − $16 = $64.
How do stacked discounts work?
Stacked discounts apply sequentially, not additively. A 20% discount followed by a 10% discount is NOT the same as 30% off. First: $100 × 0.80 = $80. Then: $80 × 0.90 = $72. The effective total discount is 28%, not 30%.
What is the effective discount percentage?
The effective discount is the total reduction expressed as a percentage of the original price. For stacked 20% + 10%: you save $28 on $100, so effective discount = 28%. Formula: Effective % = (1 − (1 − d1)(1 − d2)…) × 100.
Can I find the original price from a discounted price?
Yes. Original = Discounted price ÷ (1 − Discount % ÷ 100). If you paid $64 after a 20% discount: Original = $64 ÷ 0.80 = $80.
Is 50% off better than two 25% discounts?
They are the same. 50% off $100 = $50. Two 25% discounts: $100 × 0.75 = $75, then $75 × 0.75 = $56.25. So two 25% discounts leave you paying more ($56.25 vs $50). A single 50% is better.
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