Price Discount Calculator
Enter an original price and a discount — either a percentage or a fixed amount — to instantly see the final price, total savings, and discount percentage. Runs entirely in your browser.
⏱ 5 min read · Complete guide below
Enter original price and discount to see your savings.
How the Price Discount Calculator Works
- 1Enter the original price — the full price before any discount.
- 2Toggle between % (percentage off) and $ (fixed amount off) using the type selector.
- 3Enter the discount value and click Calculate.
- 4See the final price, total amount saved, and the effective discount percentage with a visual breakdown.
Percentage Discount vs Fixed Discount
A percentage discount scales proportionally — 30% off a $200 item saves $60, while 30% off a $30 item saves only $9. A fixed discount saves the same dollar amount regardless of price. Retailers often use percentage discounts for seasonal sales and fixed discounts for coupons and loyalty rewards, because each model communicates value differently to the shopper.
The Discount Formula, Explained
The maths behind every discount is worth understanding, because it lets you sanity-check any deal in your head. To find a sale price, multiply the original by one minus the discount as a decimal: sale price = original × (1 − discount%). So 25% off $120 is 120 × 0.75 = $90, and the saving is the difference, $30. To work backwards from a sale price to the original — useful when a tag only shows the discounted figure — divide instead: original = sale price ÷ (1 − discount%). An item marked $75 after 25% off was therefore 75 ÷ 0.75 = $100 originally. This calculator does the arithmetic for you, but knowing the formula means you are never at the mercy of a misleading price tag.
Why Stacked Discounts Don't Simply Add Up
One of the most common shopping-maths mistakes is assuming that “20% off, then an extra 10% off” equals 30% off. It does not. The second discount applies to the already reduced price, not the original. Take 20% off $100 to get $80, then 10% off $80 leaves $72 — an effective discount of 28%, not 30%. Stacked or “successive” discounts always work out to slightly less than their sum, and the gap grows with larger percentages. To model this here, apply the first discount, note the result, then run the tool again using that result as the new original price.
Spotting a Genuine Bargain
A big percentage on a tag only means genuine savings if the “original” price was real. Retailers sometimes use anchor pricing — inflating a reference price so a discount looks larger than it is. The most reliable way to compare offers is to convert everything to a real final price and a true percentage. A “$20 off” coupon on a $40 item is actually 50% off, beating a “30% off” voucher on the same product. Working in final prices, rather than being dazzled by the size of the discount claim, is how you tell a real deal from a marketing one.
Tips for Shoppers and Retailers
Compare discount types fairly
A "$20 off" coupon on a $40 item is a 50% discount — better than a "30% off" voucher on the same item. Always convert to percentage to compare deals accurately.
Watch for anchor pricing
A "50% off" tag only represents genuine savings if the original price was real. Check price history tools before assuming a discount is as large as advertised.
Stack discounts carefully
When two discounts apply, they do not simply add together. 20% off followed by an additional 10% off results in 28% off the original — not 30%.
Set floor prices before discounting
Retailers should calculate their margin at the discounted price before advertising a sale. Use the Profit Margin Calculator alongside this tool to confirm the deal is still profitable.
Frequently Asked Questions
How do I calculate a percentage discount?
Discounted Price = Original Price × (1 − Discount% / 100). For example, a 25% discount on $120 gives $120 × 0.75 = $90. The amount saved is $120 − $90 = $30.
What is the difference between a percentage discount and a fixed discount?
A percentage discount scales with the price — 20% off $200 saves $40, while 20% off $50 saves only $10. A fixed discount (e.g. $15 off) is the same dollar amount regardless of the original price.
How do I find the original price from a discounted price?
Original Price = Discounted Price / (1 − Discount%). For example, if an item costs $75 after a 25% discount, the original price was $75 / 0.75 = $100.
Can I stack multiple discounts?
This tool applies a single discount at a time. For stacked discounts, apply them sequentially: first calculate the price after the first discount, then use that as the input for the second.
Is this tool useful for retailers setting sale prices?
Yes. Use the fixed-amount mode to model clearance pricing, or the percentage mode to set a blanket sale discount across a product category. For margin-aware pricing, combine this with the Profit Margin Calculator.
How do I calculate the percentage discount from two prices?
If you know the original and the sale price, the discount percentage is the amount saved divided by the original, times 100. For example, an item reduced from $80 to $60 saved $20, and $20 ÷ $80 × 100 = 25% off. This is the fairest way to compare two deals, because it converts every offer — whether advertised as a percentage or a dollar amount — into a single comparable number.
Does the discount apply before or after tax?
In most places a discount is applied to the pre-tax price, and sales tax is then calculated on the reduced amount — so a discount lowers your tax as well as the base price. Rules vary by region and by whether tax is already included in the displayed price, as it often is in Europe. This calculator works with the price you enter, so if you need the after-tax total, apply the discount first and then add the applicable tax to the result.
What does the effective discount percentage mean for a fixed-amount coupon?
When you use a fixed dollar discount, the effective percentage is how big that saving is relative to the original price — and it changes with the price. A $15 coupon is 30% off a $50 item but only 7.5% off a $200 item. The tool shows this effective percentage so you can see, at a glance, how valuable a fixed coupon really is on a given purchase and compare it fairly against percentage offers.