Discount Calculator: How to Calculate Sale Prices, Markdowns & Savings

Why Knowing How to Calculate Discounts Matters

Sales, clearance events, coupons, and promotional offers are everywhere — but do you actually know how much you are saving? Understanding discount math helps you determine whether a deal is genuinely good, compare offers across stores, and budget your spending more effectively.

The Basic Discount Formula

Calculate the Discount Amount

Discount Amount = Original Price × (Discount Percentage / 100)

Calculate the Sale Price

Sale Price = Original Price - Discount Amount

Example

A jacket originally priced at $120 is on sale for 30% off:

Use our free Discount Calculator to calculate any discount instantly.

Types of Discounts

Percentage Off

The most common discount type. "30% off" means you pay 70% of the original price.

Dollar Amount Off

A fixed amount subtracted from the price. "$20 off any purchase over $100."

Buy One Get One (BOGO)

Buy one item at full price and get a second item free (BOGO) or at a reduced price (BOGO 50% off).

Tiered Discounts

Larger discounts for larger purchases. "10% off orders over $50, 20% off orders over $100."

Stackable Discounts

Multiple discounts applied sequentially. Important: stacked discounts are applied one after another, not added together.

A 20% off coupon plus a 10% off sale does NOT equal 30% off:

Cashback

You receive a percentage of your purchase back after buying. A 5% cashback on a $200 purchase returns $10 to you.

How to Calculate Common Discount Scenarios

Finding the Original Price From a Sale Price

If an item is $63 after a 30% discount, what was the original price?

Original Price = Sale Price / (1 - Discount Rate)

Original Price = $63 / (1 - 0.30) = $63 / 0.70 = $90

Finding the Discount Percentage

If an item dropped from $80 to $56, what percentage off is that?

Discount Percentage = ((Original - Sale) / Original) × 100

Discount Percentage = (($80 - $56) / $80) × 100 = 30%

Comparing Two Discounts

Store A offers 25% off a $160 item. Store B offers $35 off the same item.

Tax and Discounts

Discount Before Tax

In most places, sales tax is calculated on the discounted price, not the original price. This is important for budgeting.

A $100 item with 25% off and 8% sales tax:

Coupons and Tax

Some coupons are treated as "manufacturer coupons" where tax is calculated on the pre-coupon price. Store coupons typically reduce the taxable amount. Check your local tax rules.

Smart Shopping Tips

Calculate Cost Per Unit

When comparing different sizes or packages, calculate the price per unit (per ounce, per count, etc.) to find the true best deal.

Consider the Original Price

A 50% discount on an inflated price is not a deal. Some retailers raise prices before sales to make discounts look more impressive. Compare with prices at other stores.

Set a Budget First

Decide what you are willing to spend before shopping. A great discount on something you do not need is not saving money — it is spending money.

Use Percentage to Dollar Conversion

When a percentage discount sounds good but you are not sure of the actual savings, convert it to dollars. "15% off" sounds great, but on a $10 item, that is only $1.50.

Free Calculator and Shopping Tools

Conclusion

Understanding discount math makes you a smarter shopper. Whether you are comparing sales, stacking coupons, or evaluating BOGO offers, the formulas are simple once you know them. Bookmark our free Discount Calculator for instant calculations on your next shopping trip.