Discount Calculator

Say a jacket is priced at $80 and the sign says 25% off. The amount you save is $80 × 0.25 = $20, so the sale price is $80 − $20 = $60. That is the whole job of a discount calculator: turn a "percent off" tag into the real dollars you save and the price you actually pay - and, if you add your local sales tax, the exact number at the register.

The discount formula

The sale price uses one simple formula:

And the amount you save is just the difference, which is the same as multiplying by the discount directly:

For the jacket: $80 × (1 − 25 ÷ 100) = $80 × 0.75 = $60 sale price, and $80 × 0.25 = $20 saved. To work backward from a sale price to the original, divide by (1 − discount ÷ 100): a $60 tag at 25% off started at $60 ÷ 0.75 = $80.

Stacked discounts are not additive

This trips up almost everyone. If a store offers 20% off and then an extra 10% off with a coupon, you do not get 30% off. The second discount applies to the already-reduced price, so the math is 0.80 × 0.90 = 0.72 - an effective 28% off. On a $100 item that is $72, not $70. The calculator applies the second discount after the first and shows the true effective rate so you are not surprised.

Where sales tax fits in

In the U.S., sales tax is charged on the discounted price - what you actually pay - not the original sticker price. So the order is: apply the discount(s), then add sales tax to whatever is left. On a $60 sale price with an 8% tax, you pay $60 × 1.08 = $64.80 at checkout. Enter your local rate in the optional section to see the final total, or look up your combined state-and-local rate with the Sales Tax Calculator. (Manufacturer rebates can be different and may be taxed on the pre-rebate price in some states.)

Percent off vs. dollars off

A $ off coupon is a fixed amount; a % off coupon grows with the price. A flat $20 coupon and 25% off are a tie at exactly $80 - both save $20. Below $80 the dollar coupon wins; above $80 the percentage wins. When you have a choice between two coupons, plug the price into the calculator both ways and compare the amount saved. If you want to see the underlying "what is X% of Y" math on its own, the Percentage Calculator handles the raw percentage step, while this tool wraps it in the full sale-price, stacking, and tax workflow.

How to use this calculator

You only need the price and the discount to get an answer; the rest is optional.

1. Enter the original price - the pre-sale sticker or list price of the item.
2. Enter the discount as a percentage - the "% off" shown on the tag, sign, or coupon.
3. Read the sale price and amount saved - the two numbers update instantly so you can see exactly what you pay and what you keep.
4. Add a second discount (optional) - if a coupon stacks on top of the markdown, enter it and the calculator applies it to the already-reduced price and shows the true effective rate.
5. Add your sales tax (optional) - enter your local rate to turn the sale price into a real checkout total.

Because every input is optional past the first two, you can use the same tool for a quick "what's 30% off $45?" or a full stacked-coupon, tax-included estimate.

A worked example with two discounts and tax

Suppose a pair of boots lists at $120, the rack says 30% off, and you have a 15% off email coupon that stacks. First discount: $120 × 0.70 = $84. Second discount on the reduced price: $84 × 0.85 = $71.40. That is an effective discount of 1 − (0.70 × 0.85) = 40.5% off, not 45%. Now add 7% sales tax: $71.40 × 1.07 = $76.40 at the register. You saved $120 − $71.40 = $48.60 before tax. Notice that the two discounts together (40.5%) are smaller than simply adding 30 + 15 = 45% - the difference is the 4.5 percentage points you would have overestimated.

Everyday scenarios where this helps

• Clearance racks: confirm that a "final markdown" sign matches the price on the tag before you head to the register.
• Stacking promo codes: check whether an "extra 20% off sale prices" code is worth using versus a single larger coupon.
• Big-ticket purchases: on appliances or furniture, a few percentage points translate into real dollars, so it pays to compute the exact saving.
• Budgeting before you shop: work backward from what you can spend to find the highest original price that still fits after the discount and tax.
• Comparing stores: a deeper percentage at one store can still cost more if its base price is higher - compare final totals, not headline percentages.

Who this calculator is for

Anyone who has ever stared at a "30% off, plus an extra 15% with code" sign and wondered what they will actually pay can use this tool. It is built for:

• Deal hunters comparing several promotions to find which one genuinely lands the lowest checkout price.
• Budget-conscious shoppers who want to confirm a purchase fits before they get to the register, tax included.
• Coupon stackers checking whether an "extra % off sale prices" code beats a single bigger discount.
• Small-business owners and resellers setting markdowns and clearance prices and wanting to know the margin left after the cut - pair this with the Margin Calculator to see profit after the discount.
• Students and anyone brushing up on percentages who wants a worked, real-world example rather than an abstract formula.

Side-by-side: comparing two deals

The biggest advertised percentage is not always the cheapest. Imagine the same $100 item at two stores. Store A offers a flat 40% off, landing at $60. Store B offers 30% off plus an extra 20% off with a code, which sounds like 50% off but is really 0.70 × 0.80 = 0.56, or 44% off - a $56 price. Here the "smaller" headline number at Store B (30% + extra 20%) actually beats Store A's clean 40%. Now flip it: if Store B's stack were 30% off plus an extra 10% (0.70 × 0.90 = 0.63, a $63 price), Store A's straight 40% off would win. The only reliable way to choose is to compute both final prices, which is exactly what this calculator does in two quick runs. Always compare the dollar total at checkout, not the sum of the percentages on the sign.

What changes your saving the most

If you experiment with the inputs, a few factors clearly dominate how many dollars you keep:

• Original price: the single biggest lever. The same percentage off a $500 item saves ten times what it does on a $50 item, so percentage deals matter most on big-ticket purchases.
• Discount rate: each extra 5 percentage points off is worth a fixed slice of the original price - 5% off $200 is always $10 more in your pocket.
• Whether a second discount stacks: a stackable extra coupon compounds on the reduced price, but it adds fewer dollars than the same percentage applied to the full price would have.
• Sales tax: tax does not change your saving, but it raises the final number you pay - an 8% rate adds 8% to whatever the sale price is.
• Coupon type: at low prices a flat dollar coupon often beats a percentage; at high prices the percentage pulls ahead. The break-even point is where the dollar coupon equals the percentage of that price.

How the result helps in real life

The sale price tells you whether an item fits today's budget; the amount saved tells you whether the deal is actually worth acting on. The effective-discount figure is the one to trust when a store dresses up a modest markdown with a second "bonus" coupon - it strips the marketing language back to a single honest percentage. And the checkout total, with tax folded in, is the number to compare against the cash in your wallet or the limit on your card, so you are never surprised at the register. For repeat purchases or a full cart, running each line through the tool and adding the sale prices gives you a dependable basket estimate before tax, after which a single tax step finishes the job. Used this way, the calculator turns vague "that looks like a good deal" instincts into concrete dollars you can plan around.

Markdowns from the seller's side

The same math runs in reverse when you are the one setting the price. A retailer marking an item down by 30% keeps 70% of the original revenue per unit, and if that item carried a 50% markup over cost, the discount eats into - but may not erase - the profit. Sellers often set a discount by working backward from the lowest price they can accept and the cost they paid, which is the mirror image of the shopper's question. If you price products for a shop, market, or side hustle, compute the markdown here to confirm the sale price, then check the remaining margin with the Markup Calculator so a tempting "doorbuster" does not quietly sell below cost. The two calculators answer opposite ends of the same transaction: one for the buyer, one for the seller.

Key terms explained

• Original price (list price): the full pre-sale price the discount is taken from.
• Discount rate: the percentage taken off, expressed as "% off."
• Sale price: what you pay after the discount, before tax.
• Amount saved: the dollar difference between the original and sale price.
• Effective discount: the single percentage that matches the combined effect of two stacked discounts.
• Checkout total: the sale price plus any sales tax - the figure you actually pay.

Reverse-engineering a deal

Sometimes you see a sale price and want to check the claim. If a tag says $60 and "25% off," the original should have been $60 ÷ 0.75 = $80. To find the percentage off when you know both prices, use (original − sale) ÷ original × 100; an $80 item now $60 is ($80 − $60) ÷ $80 × 100 = 25% off. Checking the math this way is a quick way to spot inflated "was" prices, where a retailer marks up the list price just so the discount looks larger.

How it compares to related calculators

This page answers "what will I actually pay after this discount?" If your question is a little different, a sister tool fits better:

• For the raw "what is X% of Y" or "Y is what percent of Z" math without the sale-price wrapper, use the Percentage Calculator.
• To see how much a price went up or down between two values - say last year's price versus today's - use the Percentage Change Calculator.
• To add your state and local sales tax to any amount on its own, use the Sales Tax Calculator.
• To set a retail price from cost (the opposite of a discount), use the Markup Calculator, and to check profit after the cut use the Margin Calculator.
• For figuring a gratuity on a restaurant bill, use the Tip Calculator.

Limitations and assumptions

This calculator assumes the discount applies to the full item price with no exclusions, that any second discount stacks on the reduced price, and that sales tax is charged on the discounted amount - the standard U.S. retail treatment. It does not model minimum-purchase thresholds, brand or category exclusions, manufacturer rebates (which a few states tax on the pre-rebate price), tax-exempt items such as many groceries and clothing in certain states, or retailer-specific rounding. Treat the output as a close estimate of your total, and always read the coupon's fine print for restrictions.

Sources

• Federal Trade Commission (FTC) - consumer guidance on shopping, advertised prices, and comparison shopping
• Federal Trade Commission (FTC) - comparing products, prices, and deals