Discount Calculator

How to calculate a discount

To calculate the final price after a discount, multiply the original price by the discount percentage, then subtract the result from the original price:

Example: A $100 shirt with a 25% discount:

Reverse discount: finding the discount percentage

If you know the original price and the sale price, you can find the discount percentage with:

Use the Reverse mode toggle in the calculator to do this instantly.

Stacked discounts (double promotions)

When stores offer "50% off + 20% extra", the discounts are not simply added to make 70%. They're applied in sequence:

• Original price: $100
• After first discount (50%): $50
• After second discount (20% of $50): $40
• Total effective discount: 60% (not 70%)

Enable the Double discount toggle to calculate these stacked promotions correctly.

When to use a discount calculator

• Shopping — quickly know how much you'll actually pay
• Black Friday / seasonal sales — compare multiple offers
• Business pricing — set discounted prices for customers
• Coupon stacking — see the real value of layered promotions
• Reverse verification — check if a store is honest about the "70% off" they advertise

Discount math that tricks people

• Stacked ≠ summed: “50% off + extra 20%” is not 70% off — it’s 60% (100 → 50 → 40). That’s why our Double Discount toggle exists.
• Quick 10% mental rule: move the decimal one place left ($80 → $8). 20% = double it, 5% = half it, 15% = 10% + 5%.
• Reverse mode answers “what was the original price?” when you only know the sale price and the % off.
• “Was/now” check: divide current by original — some “40% off” tags are actually 25%.

Your privacy

All calculations happen instantly in your browser. Your values are never sent to any server and never stored.