Discount Calculator - Free Online Tool

Calculate sale prices, savings, and final costs with discounts and tax

Welcome to our free Discount Calculator, the fastest way to figure out how much you will actually pay during a sale, promotion, or clearance event. Whether you are shopping online, browsing a department store, or comparing deals on Black Friday, this calculator helps you determine the final price after any discount in seconds. Discounts are everywhere, from seasonal sales and coupon codes to employee discounts and loyalty rewards. Our calculator supports both percentage-based discounts (like 20% off) and fixed-amount discounts (like $15 off). You can even stack two discounts on top of each other, which is common when stores offer an extra percentage off already reduced items. One of the most useful features is the optional sales tax calculation. After computing the discounted price, the calculator applies your local sales tax rate so you can see the true out-of-pocket cost. No more surprises at the register! Sales tax rates vary by state and locality in the United States, ranging from 0% in states like Oregon to over 10% in some cities. The quick-select discount buttons let you instantly see prices at popular discount levels: 5%, 10%, 15%, 20%, 25%, 30%, 40%, 50%, and 75%. This is perfect for quickly comparing different coupon codes or figuring out which sale gives you the best deal. Stacked discounts, also called successive or compounding discounts, work differently from what many shoppers expect. A 20% discount followed by an additional 10% discount does NOT equal 30% off. Instead, the second discount is applied to the already-reduced price. For example, on a $100 item, 20% off gives you $80, then 10% off $80 gives you $72, which is actually 28% off the original price. Our calculator handles this math correctly and shows you the breakdown at each step. All calculations run entirely in your browser. No personal or financial data is sent to any server, ensuring complete privacy. The calculator works on all devices, including smartphones, tablets, and desktop computers, making it ideal for use while shopping in stores or browsing deals online.

Understanding Discounts

A discount is a reduction in the original price of a product or service. Discounts can be expressed as a percentage of the original price or as a fixed dollar amount subtracted from it.

How Percentage Discounts Work

A percentage discount reduces the price by a proportion of the original amount. For example, 25% off a $200 item means you save $50 (200 x 0.25), paying $150 instead. The higher the percentage, the bigger the savings.

How Stacked Discounts Work

Stacked discounts are applied one after another, not combined. A 20% discount plus a 10% discount does not equal 30% off. The second discount is calculated on the already-reduced price. This always results in slightly less savings than a single combined discount.

Formulas

Discount Amount

Discount = Original Price × (Discount Rate / 100)

The savings amount is the original price multiplied by the discount percentage expressed as a decimal.

Final Price After Discount

Final Price = Original Price - Discount Amount

Subtract the discount amount from the original price to get the sale price. Equivalently: Final Price = Original Price × (1 - Rate/100).

Stacked (Double) Discount

Final Price = Original Price × (1 - d₁/100) × (1 - d₂/100)

When two discounts are applied sequentially, the second discount applies to the already-reduced price. A 20% + 10% stacked discount equals 28% total, not 30%.

Final Price with Sales Tax

Total = Final Price × (1 + Tax Rate / 100)

Sales tax is calculated on the discounted price, not the original. This means discounts also reduce the tax you pay.

Reference Tables

Common Discount Scenarios

Real-world discount types showing how different promotions translate to actual savings on a $100 item.

Discount Type	Example	Price on $100 Item	Effective Savings
Percentage Off	25% off	$75.00	25%
Fixed Amount Off	$15 off any purchase	$85.00	15%
Buy One Get One 50% Off	Two $100 items	$150.00 for two	25% per item
Stacked: 20% + 10%	Sale + extra coupon	$72.00	28%
Stacked: 30% + 20%	Clearance + loyalty	$56.00	44%
Tiered: Spend $200 save $50	$200 purchase	$150.00	25%
Double Discount Myth: 25% + 25%	Two 25% coupons	$56.25	43.75% (not 50%)

Stacked Discount Equivalents

Shows the true combined discount when two percentage discounts are stacked sequentially.

First Discount	Second Discount	Combined Effect	Difference from Simple Addition
10%	10%	19.0%	-1.0%
20%	10%	28.0%	-2.0%
20%	20%	36.0%	-4.0%
30%	15%	40.5%	-4.5%
30%	20%	44.0%	-6.0%
40%	20%	52.0%	-8.0%
50%	25%	62.5%	-12.5%

Worked Examples

25% Off a $120 Item

A jacket originally priced at $120 is on sale for 25% off, with 8.25% sales tax.

Discount amount: $120 × 0.25 = $30.00

Sale price: $120 - $30 = $90.00

Sales tax: $90.00 × 0.0825 = $7.43

Final total: $90.00 + $7.43 = $97.43

You pay $97.43 out the door, saving $30.00 (25%) on the jacket. The discount also saved you $2.48 in sales tax compared to buying at full price.

Stacked 20% + 10% on a $200 Item

A store-wide 20% sale plus an additional 10% off coupon on a $200 pair of shoes.

First discount (20%): $200 × 0.20 = $40 → Price after first: $160

Second discount (10% of $160): $160 × 0.10 = $16 → Price after second: $144

Total savings: $200 - $144 = $56

Effective discount: $56 / $200 × 100 = 28%

Final price is $144.00, saving $56.00 (28% effective discount). Note this is less than a single 30% discount, which would give $140.00.

Finding the Original Price from a Sale Price

You see a shirt on sale for $45 after a 40% discount. What was the original price?

After a 40% discount, you pay 60% of the original price

Sale Price = Original Price × (1 - 0.40)

$45 = Original Price × 0.60

Original Price = $45 / 0.60 = $75.00

The original price was $75.00. The 40% discount saved you $30.00.

How to Use the Discount Calculator

Enter the Original Price

Type in the full retail or listed price of the item before any discounts are applied. This is the sticker price you see on the tag or product listing.

Choose Discount Type and Amount

Select either percentage off or fixed dollar amount off. Use the quick-select buttons for common percentages (5%-75%), or type a custom discount value.

Add Tax and Stacked Discounts (Optional)

Enter your local sales tax rate to see the true final cost. If you have a second coupon or additional discount, enter it in the stacked discount field to see the combined savings.

View Your Savings

See the final price, total savings amount, savings percentage, and a full breakdown including tax. The quick comparison chart shows prices at different discount levels for easy reference.

Frequently Asked Questions

How do I calculate a discount percentage?

To calculate a discount, multiply the original price by the discount percentage expressed as a decimal. For example, 25% off a $80 item: $80 x 0.25 = $20 discount, so the sale price is $80 - $20 = $60. Our calculator does this instantly. Simply enter the original price, select or type your discount percentage, and the tool calculates the discount amount and final price. You can also work backwards: if you know the sale price and original price, the savings percentage is (original - sale) / original x 100.

How do stacked or successive discounts work?

Stacked discounts are applied sequentially, not added together. If a store offers 30% off plus an extra 20% off, the second discount applies to the already-reduced price, not the original. On a $100 item, 30% off gives $70, then 20% off $70 gives $56. That is a total savings of $44, or 44%, not 50% as you might expect by adding 30% + 20%. Our calculator shows the price after each discount step so you can see exactly how the math works. This is important when comparing a single larger discount to two smaller stacked ones.

Is sales tax applied before or after a discount?

In the United States, sales tax is almost always calculated on the discounted price, not the original price. If an item is originally $100 and you get 20% off, your taxable amount is $80. With an 8% sales tax rate, you would pay $80 + $6.40 = $86.40 total. This is good news for shoppers because discounts reduce your tax burden as well. Our calculator applies sales tax after all discounts have been subtracted, which matches how retailers process transactions. Some states have no sales tax at all, such as Oregon, Montana, New Hampshire, and Delaware.

What is the difference between a percentage discount and a fixed amount discount?

A percentage discount takes a proportion of the original price, while a fixed amount discount subtracts a specific dollar value. For example, 20% off a $50 item saves you $10, but 20% off a $200 item saves you $40. The dollar savings scales with the price. A fixed $10 discount always saves exactly $10 regardless of the item price. Percentage discounts are better for expensive items, while fixed discounts can be better for cheaper items. Our calculator supports both types so you can compare and choose the best deal for your purchase.

How can I tell which sale or coupon gives me the best deal?

To compare deals, calculate the final price for each offer using our discount calculator. Sometimes a smaller percentage discount on a higher-priced item saves more money than a larger percentage on a cheaper item. Also compare stacked discounts versus single discounts: 25% off once may actually be better than 15% off plus 10% off (which equals 23.5% total savings). Use the quick comparison feature at the bottom of the results to see prices at 10%, 20%, 30%, and 50% off side by side. Always factor in sales tax for the most accurate comparison between different stores or websites.