Discount Calculator
Adjust the inputs below. Results update as you type.
How it works
Use this when you need flexible discount math: known original + percent off, or reverse-solving the pre-sale price from a ticketed sale amount. Sale price = original × (1 − discount%). To recover the original from a sale tag: original = sale ÷ (1 − discount%). Stacked promotions multiply remaining price factors rather than adding percents—20% then 10% leaves 72% of original (28% total off), not 70%. Decide whether tax applies before or after the markdown in your locality. Prefer this tool over a one-way percent-off helper when you are reconstructing stickers, coupons, or “was/now” claims.
Input guidance
- Enter the original price before the discount.
- Use the percent off as advertised (stacking rules may differ).
- Decide whether tax is applied before or after the discount at checkout.
The formula
Sale price = original × (1 − discount rate). The amount saved is original × discount rate. Stack multiple discounts multiplicatively, not additively.
Worked example
A $80 item at 25% off costs 80 × 0.75 = $60, saving $20. An extra 10% off that takes it to $54 — not $52, because the second discount applies to $60.
More examples to test
- $120 item at 25% off: sale price and dollars saved.
- Two sequential discounts of 20% then 10%: compare with a single 30% off.
How to interpret results
Use the sale price for budgeting. Stacked discounts usually apply to the remaining price, not the original.
When this can be inaccurate
Coupons, exclusions, and tax timing vary by retailer.
Change history
- June 2026: Quality-reviewed for publication with formula checks and explanatory copy updates.
Site-wide corrections also appear on the corrections log.
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Frequently asked questions
How do I stack two discounts?+
Apply them one after another. Two 20% discounts give 0.8 × 0.8 = 64% of the price (a 36% total saving), not 40% off.
How do I find the percent off?+
Divide the saving by the original price. Saving $15 on a $60 item is 15 ÷ 60 = 25% off.
Does tax come before or after the discount?+
Discounts apply to the pre-tax price, then sales tax is calculated on the reduced amount in most jurisdictions.
How should I use this result?+
Treat it as a planning estimate. Compare at least two realistic scenarios, then confirm with statements, quotes, or a qualified professional before acting.
How often should I refresh assumptions?+
Refresh whenever rates, income, costs, or policy limits change materially, and before making irreversible commitments.