How to use Discount Calculator
This discount calculator finds the sale price and the amount you save from an original price and a percentage off — and can stack multiple discounts or work backwards to reveal the real discount on a "was/now" price. See the final price, total savings and effective discount so you can judge whether a deal is as good as it looks.
- Enter the original price.
- Enter the discount percentage (or stack several).
- Optionally add sales tax to see the final checkout price.
- Review the sale price and how much you save.
- Compare against the original to see the effective discount.
Your data never leaves your device — 100% private processing.
Single and stacked discounts
A single percentage discount gives sale price = original × (1 − rate). Stacked discounts apply one after another, not added together: 20% then an extra 10% is 0.8 × 0.9 = 0.72, a 28% effective discount — not 30%. This calculator handles the order correctly so you see the true final price.
Spotting a genuine deal
A large percentage off an inflated "original" price can be worse than a smaller discount on a fair price, so compare the final price against what you would pay elsewhere. Watch for prices that go up before a sale, and remember that adding tax at checkout reduces the effective saving on the headline discount.
| First discount | Second discount | Effective total discount |
|---|---|---|
| 10% | 10% | 19% (not 20%) |
| 20% | 10% | 28% (not 30%) |
| 25% | 20% | 40% (not 45%) |
| 30% | 30% | 51% (not 60%) |
| 50% | 50% | 75% (not 100%) |
Worked examples
Single discount
Inputs: $200 · 25% off
Result: $150 price · $50 saved
Stacked
Inputs: $200 · 20% then 10%
Result: $144 price · 28% effective
Glossary
- Discount rate
- The percentage taken off the original price.
- Sale price
- The price after the discount is applied.
- Stacked discount
- Multiple discounts applied in sequence, each on the reduced price.
- Effective discount
- The total percentage saved versus the original price.
Related reading
Frequently Asked Questions
Why use Discount Calculator?
- Applies stacked discounts in sequence — not summed — for the mathematically correct result
- Reverse mode reveals the actual discount on any "was / now" price pair
- Adds sales tax after the discount for the actual checkout total, not just the headline saving
- Shows the effective discount rate, which compound stacking makes lower than it appears
Common use cases
- Check whether a "20% off then extra 10%" promotion actually saves 28%, not 30%
- Calculate the sale price and exact dollar saving on a $350 item at 35% off
- Verify that a clearance price represents a genuine reduction from the original retail price
- Find the final checkout total after stacking a store coupon and a category promotion
- Work out the effective discount on a bulk-buy offer before committing to the purchase
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