Free discount calculator

How to use

1. Select Percent off (for a “20% off” tag) or Dollar off (for “$30 off”).
2. Enter the original price before any discount.
3. Enter the discount — a percentage or a dollar amount.
4. The amount saved, final price, and effective discount percentage appear instantly.

Formula

Percent-off mode:

• Savings = price × (discount% ÷ 100)
• Final = price − savings

Dollar-off mode:

• Final = price − discount amount
• Discount% = savings ÷ price × 100

Worked examples

$80 item at 25% off

• Savings = 80 × 0.25 = $20
• Final price = 80 − 20 = $60

$200 item with $30 off

• Final price = 200 − 30 = $170
• Effective discount = 30 ÷ 200 = 15%

Stacked discounts — 20% off, then extra 10% off

Discounts compound multiplicatively, not additively:

• After first 20% off: 100 × 0.80 = $80
• After extra 10% off: 80 × 0.90 = $72
• Total effective discount = 28%, not 30%

Notes

• Sales tax stacks on top. Most U.S. states apply sales tax to the discounted price, not the original. Run the final price through the sales-tax calculator next.
• Coupon timing matters. A “$10 off” coupon applied before tax reduces the tax too; applied after tax it doesn’t.
• Final price floors at $0. The calculator won’t return a negative number even if the discount exceeds the original price.