Discount Calculator
Our free discount calculator finds the sale price, your savings in dollars and percent, stacked coupon totals, and the final price with sales tax — instantly, as you type. Enter the original price and discount percent, add an extra coupon if you have one, and see exactly what you'll pay.
Enter your numbers
Your results
| Savings (percent) | — |
|---|---|
| Price with extra coupon | — |
| Combined discount | — |
| Estimated sales tax | — |
| Final price with tax | — |
Tax is figured on the discounted price (the common US practice — an assumption, not a rule in every state). Totals are estimates rounded to the cent.
How to use this calculator
Start with the original price — the sticker price before any sale. Then set the discount percent with the slider: 25% off, 50% off, a 15% promo code, anything up to 95%.
If you have an extra coupon or a second store discount that stacks, enter its percent in the second field. It is applied to the already-discounted price, exactly how stacked coupons work at checkout.
Optionally add your local sales tax percent to see the out-the-door total. Everything recalculates instantly as you change any number, and the Calculate button re-runs the math on demand.
How it works
The core formula is simple: sale price = original price × (1 − discount ÷ 100). So an $80 item at 25% off costs 80 × (1 − 0.25) = $60.00, and you save $80.00 − $60.00 = $20.00.
A stacked coupon applies to the discounted price, not the original: stacked price = sale price × (1 − second discount ÷ 100). That is why 25% off plus an extra 10% coupon gives $60.00 × 0.90 = $54.00 — a 32.5% combined saving, not 35%. The discounts multiply; they don't add.
Sales tax is applied last: final price = discounted price × (1 + tax ÷ 100). This assumes tax is charged after discounts, which is the common practice in most US states — but a few states tax the pre-discount price, so we label the tax figure an estimate.
Assumptions and honesty notes: intermediate values are not rounded — only the displayed totals are rounded to the cent; percent inputs above 100% are capped because a discount can't exceed the price; and shipping, handling, and state-specific tax quirks are not included.
Frequently asked questions
How do you calculate a discount?
Multiply the original price by one minus the discount percent: sale price = original price × (1 − discount ÷ 100). For example, an $80 item at 25% off costs 80 × 0.75 = $60.00, so you save $20.00.
Do stacked discounts just add up?
No — a second discount applies to the already-discounted price, so they multiply rather than add. On an $80 item, 25% off leaves $60.00, and an extra 10% coupon takes 10% off the $60.00, giving $54.00. The combined saving is 32.5%, not 35%.
Is sales tax charged before or after the discount?
This calculator assumes sales tax is charged after discounts, which is the common practice in most US states: tax is figured on the price you actually pay. A few states have exceptions, so treat the tax total as an estimate and check your state's rules for an exact figure.
What's the difference between this and the profit margin calculator?
This discount calculator is for shoppers: it starts with a retail price and works out what you pay after discounts. Our profit margin vs markup calculator is for merchants: it starts with cost and selling price to show how much profit you keep. One answers "how much do I pay," the other answers "how much do I earn."
How do I find the original price from a sale price?
Divide the sale price by one minus the discount percent: original = sale ÷ (1 − discount ÷ 100). If a shirt is on sale for $60.00 at 25% off, its original price was 60 ÷ 0.75 = $80.00.