Discount Price Calculator
The discount price is the price you pay after the discount — the number that matters at the checkout. Everything else, the original price and the percentage, is just the route to it. The discount price calculator above finds it for any deal: percent off, fixed amount off, two discounts stacked, and sales tax on top.
This page explains how discount prices are worked out, compares deal types, and shows you how to judge whether a discount is actually a good deal.
How a Discount Price Is Calculated
There are three kinds of discount, and each has its own formula. For percent off: discount price = original price × (1 − percent ÷ 100). For a fixed amount off: discount price = original price − amount. For stacked discounts: apply the first, then apply the second to the result. Then add sales tax if it applies, on the discounted price. The calculator above has a mode for each type, and it shows the breakdown — original price, each discount step, the saving, and the tax — so you can see exactly how the final number was reached.
Worked Example: Percent Off
A $100 item at 25% off: discount price = 100 × (1 − 0.25) = $75.00. The saving is $25.00. This is the calculator’s default result, and it is the simplest case — one price, one percentage, one multiplication.
Worked Example: Fixed Amount Off
A $120 item with $20 off: discount price = 120 − 20 = $100.00. The effective discount is 20 ÷ 120 = 16.7%. Fixed discounts are worth more, in percentage terms, on cheap items: the same $20 off a $40 item is a 50% discount, giving a price of $20.
Worked Example: Stacked Discounts
An $80 item with 20% off, then a further 10% off: after the first discount the price is 80 × 0.80 = $64.00. After the second it is 64 × 0.90 = $57.60. The total saving is $22.40, an effective discount of 28%, not 30%. The calculator’s stacked mode shows both steps in its breakdown table.
Discount Price Reference
The table below shows the discount price for a $100 item under each discount type, so you can compare them directly.
| Deal | Discount price ($100 item) | You save | Effective discount |
|---|---|---|---|
| 20% off | $80.00 | $20.00 | 20% |
| $20 off | $80.00 | $20.00 | 20% |
| 25% off | $75.00 | $25.00 | 25% |
| 20% then 10% off | $72.00 | $28.00 | 28% |
| 30% off | $70.00 | $30.00 | 30% |
| $30 off | $70.00 | $30.00 | 30% |
| 50% off | $50.00 | $50.00 | 50% |
| 20% then 25% off | $60.00 | $40.00 | 40% |
Notice that 20% off and $20 off give the same result on a $100 item — because 20% of $100 is $20. They only differ when the price changes: on a $200 item, 20% off gives $160 while $20 off gives $180. On a $50 item, 20% off gives $40 while $20 off gives $30. The fixed discount wins on cheap items; the percentage wins on expensive ones.
Is the Discount a Good Deal?
A discount price is only a deal if the price is good compared with what you would pay elsewhere. Three checks:
- Compare the final price, not the percentage. A 50% discount on an overpriced item can cost more than a 10% discount on a fairly priced one.
- Check the “was” price. Some stores raise the original price before a sale. Search the item online to see its usual price.
- Include tax and shipping. A $75 sale price with 8% tax and $10 shipping is $91 at the door, not $75.
- Ask if you need it. The best discount on something you do not need is still money spent, not money saved.
- Check the return policy. Clearance and final-sale items often cannot be returned, which makes a bad fit expensive.
Discount Prices With Tax
Tax is charged on the discounted price in most places, and it changes the final number. The table below shows the checkout total for three items at common tax rates.
| Item and discount | Price before tax | Tax at 8% | Total at checkout |
|---|---|---|---|
| $120 at 15% off | $102.00 | $8.16 | $110.16 |
| $200 at 25% off | $150.00 | $12.00 | $162.00 |
| $80 at 20% then 10% off | $57.60 | $4.61 | $62.21 |
| $250 at 40% off | $150.00 | $12.00 | $162.00 |
Check the stacked row: $57.60 × 0.08 = $4.61 of tax, giving a total of $62.21. And the $200 row: $150 × 1.08 = $162.00. The calculator has a tax field — enter your local rate and it shows the tax and the total in the breakdown.
Working Backwards From a Discount Price
Sometimes you know the price you paid and want the original: divide the discount price by one minus the discount rate. Paid $75 after 25% off? The original was 75 ÷ 0.75 = $100. Paid $57.60 after 20% then 10%? The original was 57.60 ÷ 0.72 = $80. Paid $90 after 20% then 25%? The original was 90 ÷ 0.60 = $150. This is useful when a receipt shows only the final price and you want to check the discount was applied correctly.
Common Discount Price Mistakes
- Adding stacked discounts. 20% then 10% is 28% off, not 30%.
- Forgetting tax. The tag price is not the checkout price.
- Comparing percentages, not dollars. 50% off $40 saves $20; 20% off $200 saves $40.
- Trusting the crossed-out price. Verify the usual price before believing the saving.
- Rounding each step. Round only at the end, or the error compounds across stacked discounts.
Related tools: what saving the difference could grow to with the compound interest calculator, and your salary calculator for the bigger picture of what you earn and spend. The Federal Trade Commission has advice on spotting misleading sale prices and shopping safely.
Key Takeaways
Use the discount calculator above with your own numbers, and keep the reference figures below handy while you plan.
| Deal | Sale price ($100 item) | You save |
|---|---|---|
| 10% off | $90.00 | $10.00 |
| 25% off | $75.00 | $25.00 |
| 40% off | $60.00 | $40.00 |
| 50% off | $50.00 | $50.00 |
| 20% then 10% off | $72.00 | $28.00 |
| $20 off | $80.00 | $20.00 |
What to remember
- Sale price is the original price times one minus the discount rate.
- Stacked discounts multiply, they do not add: 20 percent then 10 percent is 28 percent off, not 30.
- Tax is usually charged on the discounted price, not the original.
- Compare the dollars you save, not the percentage — 20 percent off $200 beats 50 percent off $40.
- A fixed discount wins on cheap items; a percentage wins on expensive ones.
Your checklist
- Choose the discount type in the calculator above: percent off, fixed amount or stacked.
- Enter the original price and the discount.
- Add your sales tax rate if you want the checkout total.
- Read the final price, the saving and the effective discount.
- Compare the final total with other stores before buying.
Mistakes to avoid
- Adding stacked discounts instead of multiplying them.
- Forgetting sales tax, which arrives at the till.
- Trusting the crossed-out “was” price without checking the usual price.
- Rounding each step instead of rounding only at the end.
- Confusing “20 percent off” with “pay 20 percent of the price”.
Getting the Best Price After a Discount
A discount price is only a good deal if the starting price was honest. Some stores raise the regular price before a sale, so the percentage off looks bigger than the saving really is. Before you buy, check the same item at another store or look at its price history. If the so-called sale price is close to what other shops charge every day, the discount is mostly decoration. A quick check with the calculator above tells you the real final price in seconds, and comparing that number across two or three sellers is the fastest way to spot a genuine bargain.
Timing matters too. End-of-season clearances, holiday weekends, and model changeovers are when the deepest cuts usually appear. If you can wait, set a target price and buy only when the item reaches it. Patience turns an ordinary 20 percent off into a real saving.
- Compare the sale price at two or three stores before buying.
- Check whether the discount applies before or after tax.
- Watch for extra fees, like delivery, that eat into the saving.
- Keep the receipt in case a better price appears within the return window.
- Do not buy something you do not need just because it is discounted.
Frequently Asked Questions
How do I calculate the discount price?
For percent off, multiply the original price by one minus the discount rate: $100 at 25% off is 100 × 0.75 = $75. For a fixed discount, subtract the amount: $120 with $20 off is $100. For stacked discounts, apply them one after the other.
What is the discount price of a $200 item at 25% off?
$150. The saving is 200 × 0.25 = $50, so the price is 200 − 50 = $150. With 8% tax the checkout total is $150 × 1.08 = $162.
How do I work out a discount price with two discounts?
Apply them in order, each to the discounted price. An $80 item at 20% then 10% off: 80 × 0.80 = $64, then 64 × 0.90 = $57.60. The total discount is 28%, not 30%.
Is a fixed discount or a percent discount better?
It depends on the price. On a $100 item, 20% off and $20 off are identical. On a $200 item, 20% off ($40 saved) beats $20 off. On a $50 item, $20 off beats 20% off ($10 saved). The break-even price is the fixed amount divided by the rate.
How do I find the original price from the discount price?
Divide the discount price by one minus the discount rate. Paid $75 after 25% off? The original was 75 ÷ 0.75 = $100. Paid $57.60 after 20% then 10%? The original was 57.60 ÷ 0.72 = $80.
Does sales tax apply before or after the discount?
Usually after, on the discounted price. A $120 item at 15% off is $102, and 8% tax on $102 is $8.16, giving a total of $110.16. Some places tax the original price instead — check your receipt and local rules.
Disclaimer: This calculator is for general information only. Prices, discounts and sales tax rules vary by store and location. Tax is usually charged on the discounted price, but some places tax the original price — check your receipt and local rules.