Enter the original price and the discount percentage to get the final price and savings.
Enter the original price and a fixed discount amount to see what you pay and what you save.
Know the original and sale price? Find out the exact discount percentage and how much was saved.
Apply up to three discounts in sequence. Each discount applies to the price after the previous one.
Discounts are easy to misread. A 20% off sticker tells you something, but not the full picture. Two stacked discounts are almost never what you think they are. And if you are looking at a sale price next to an original price, working out the percentage in your head is a reliable way to get it wrong.
This calculator has four tabs. Each one solves a different problem.
Percentage Discount Tab
You know the original price and the percentage off. You want the final price and the exact amount you save.
Enter the original price, enter the discount percentage, click Calculate.
| Original Price | Discount | You Save | Final Price |
|---|---|---|---|
| $100.00 | 10% | $10.00 | $90.00 |
| $250.00 | 25% | $62.50 | $187.50 |
| $89.99 | 15% | $13.50 | $76.49 |
| $1,200.00 | 40% | $480.00 | $720.00 |
| $49.95 | 5% | $2.50 | $47.45 |
The result shows all four values: savings, final price, original price confirmed, and the discount percentage. The confirmation of the percentage is there so you can verify what you entered before sharing or acting on the result.
Fixed Discount Tab
Some discounts are a flat amount. A voucher that takes $20 off, a loyalty reward of $50, a staff discount that knocks a fixed amount off every purchase. These are not percentages.
Enter the original price and the discount amount. The calculator returns the final price, savings, and the equivalent percentage, which helps when you are comparing a fixed offer against a percentage deal.
| Original Price | Discount Amount | You Save | Final Price | Equivalent % |
|---|---|---|---|---|
| $150.00 | $20.00 | $20.00 | $130.00 | 13.33% |
| $75.00 | $10.00 | $10.00 | $65.00 | 13.33% |
| $500.00 | $50.00 | $50.00 | $450.00 | 10.00% |
| $99.99 | $15.00 | $15.00 | $84.99 | 15.00% |
| $2,000.00 | $250.00 | $250.00 | $1,750.00 | 12.50% |
The discount amount cannot exceed the original price. Enter a number higher than the original and the calculator stops before running.
Find Discount Percentage Tab
You see a product marked down from $59.99 to $35.00. The retailer does not display the percentage. You want to know the real figure before you decide whether the deal is worth it.
Enter the original price and the sale price. The calculator returns the exact discount percentage and the amount saved.
| Original Price | Sale Price | Discount % | You Save |
|---|---|---|---|
| $59.99 | $35.00 | 41.66% | $24.99 |
| $200.00 | $150.00 | 25.00% | $50.00 |
| $129.99 | $99.99 | 23.08% | $30.00 |
| $80.00 | $64.00 | 20.00% | $16.00 |
| $1,500.00 | $999.00 | 33.40% | $501.00 |
The sale price cannot be higher than the original price. If it is, you get an error before anything runs.
This tab is also worth using to verify retailer claims. Some retailers inflate the “original” price before applying a discount to make the saving look larger than it is. Comparing across stores using actual prices reveals the real picture faster than any sticker.
Multi-Discount Tab: How Stacked Discounts Work
This is where most people get it wrong.
When two percentage discounts apply to the same product, they do not add. The second discount applies to the price after the first one, not to the original. A 20% discount followed by a 10% discount gives you 28% off total, not 30%. The gap is small on one transaction. Across dozens of purchases, it adds up.
Research on consumer behavior confirms this is a widespread error. Studies show shoppers consistently overestimate combined discount totals when they use simple addition rather than sequential calculation. A 25% plus 20% stacked discount feels like 45% off. The actual effective discount is 40%.
Enter the original price and up to three discount percentages. Discounts 2 and 3 are optional. The calculator applies them in sequence and returns the effective combined discount, total savings, and final price.
| Original | Discount 1 | Discount 2 | Discount 3 | Effective Discount | Final Price |
|---|---|---|---|---|---|
| $100.00 | 20% | 10% | — | 28.00% | $72.00 |
| $200.00 | 15% | 15% | — | 27.75% | $144.50 |
| $500.00 | 30% | 20% | 10% | 49.60% | $252.00 |
| $80.00 | 25% | 5% | — | 28.75% | $57.00 |
| $1,000.00 | 10% | 10% | 10% | 27.10% | $729.00 |
Look at row three. Three discounts of 30%, 20%, and 10% feel like 60% off. The actual effective discount is 49.6%. That is still a strong deal, but 10 percentage points lower than simple addition suggests. This tab shows you the real number before you commit.
Discount Formulas Explained
Every tab in this calculator uses one of four formulas. Here they are in plain form.
| What You Want | Formula | Example |
|---|---|---|
| Discount Amount | Original Price × (Discount % ÷ 100) | $200 × 0.25 = $50 |
| Final Price (percentage off) | Original Price × (1 − Discount % ÷ 100) | $200 × 0.75 = $150 |
| Final Price (fixed amount off) | Original Price − Discount Amount | $200 − $30 = $170 |
| Discount Percentage | ((Original − Sale Price) ÷ Original) × 100 | ((200 − 150) ÷ 200) × 100 = 25% |
| Stacked Discount (two) | 1 − ((1 − D1) × (1 − D2)) | 1 − (0.80 × 0.90) = 28% |
| Stacked Discount (three) | 1 − ((1 − D1) × (1 − D2) × (1 − D3)) | 1 − (0.70 × 0.80 × 0.90) = 49.6% |
Quick Mental Math Shortcuts for Common Discounts
For times when you need a quick estimate without opening the calculator.
10% off: Move the decimal one place to the left. 10% of $85 = $8.50. Final price: $76.50.
20% off: Find 10%, then double it. 10% of $85 = $8.50, doubled = $17. Final price: $68.
15% off: Find 10%, then add half of that. 10% of $80 = $8, half = $4. Total off = $12. Final price: $68.
25% off: Divide by 4. 25% of $120 = $30. Final price: $90.
50% off: Divide by 2. 50% of $90 = $45.
For anything more precise, or for two discounts applied in sequence, use the calculator. Mental math compounds errors quickly when discounts stack.
Currency
The calculator reads your browser’s locale when the page loads and sets the matching currency automatically. If you need a different one, the dropdown at the top covers 50 currencies across Africa, the Americas, Europe, the Middle East, and Asia. Switching currencies updates every field and result instantly.
Input Rules
- Discount percentages must be between 0 and 100.
- The fixed discount amount cannot exceed the original price.
- The sale price on the Find Discount tab cannot exceed the original price.
- If any of these conditions are not met, the calculator tells you before running.
- Press Enter on any input field to trigger the calculation.
Frequently Asked Questions
How do you calculate a percentage discount?
Multiply the original price by the discount percentage, then divide by 100. That gives you the discount amount. Subtract it from the original price to get the final price.
Formula: Final Price = Original Price × (1 − Discount % ÷ 100)
Example: 20% off $150 = $150 × 0.80 = $120. You save $30.
How do you find the discount percentage from a sale price?
Subtract the sale price from the original price to find the amount saved. Divide that by the original price, then multiply by 100.
Formula: Discount % = ((Original Price − Sale Price) ÷ Original Price) × 100
Example: Original $80, sale price $60. Discount = (80 − 60) / 80 × 100 = 25%.
Do two discounts add together?
No. When two percentage discounts apply to the same item in sequence, the second applies to the already-reduced price. A 20% discount followed by a 10% discount gives 28% off total, not 30%. Use the Multi-Discount tab to get the correct effective combined discount.
What is the formula for two stacked discounts?
Effective Discount = 1 − ((1 − D1) × (1 − D2)), where D1 and D2 are each discount expressed as a decimal.
Example: 20% and 10% = 1 − (0.80 × 0.90) = 1 − 0.72 = 0.28 = 28% effective discount.
What is the difference between a percentage discount and a fixed discount?
A percentage discount takes a set proportion off the original price, so the saving changes with the price. A fixed discount deducts a flat amount regardless of price. A $20 off voucher saves the same $20 on a $50 item or a $500 item. A 20% off coupon saves $10 on a $50 item but $100 on a $500 item.
How do I quickly calculate 10% or 20% off in my head?
For 10%: move the decimal point one place to the left. 10% of $75 = $7.50. For 20%: find 10% then double it. For 25%: divide by 4.
Can I use this calculator to compare two different sale prices on the same item?
Yes. Use the Find Discount tab twice, once for each store’s sale price, with the same original price. The results show the exact percentage off for each, so you see which deal is larger at a glance.
Why do some retailers show a higher original price before applying a discount?
Inflating the “original” price before discounting is a known retail tactic. It makes the saving appear larger than it is. Using the Find Discount tab with the actual price you have seen elsewhere gives you the real discount percentage, not the one implied by a comparison to an inflated reference price.
What is coupon stacking, and how does the Multi-Discount tab handle it?
Coupon stacking means applying more than one discount to a single purchase — for example, a store sale price plus a manufacturer coupon plus a loyalty reward code. Each discount applies to the price remaining after the previous one. The Multi-Discount tab applies up to three percentage discounts in sequence and shows the true effective combined rate, the total saving in currency, and the final price. It will always be lower than adding the percentages together.
