Discount Calculator
Find the sale price and how much you save, with optional sales tax.
Enter the original price and a discount percentage to see the sale price and your savings. Add a sales-tax rate to also get the final price you pay at the register.
Type the original price and the discount percentage to see the sale price and how much you save right away. If you want the amount you'll actually pay at checkout, add your local sales-tax percentage as well — the final price updates automatically.
Formula & methodology
savings = price × discount% ; sale price = price − savings ; final = sale price × (1 + tax%)
Worked example
- Price 200, 25% off, 10% tax → Sale 150, save 50, final 165
Assumptions
- Sales tax is calculated on the discounted price, not the original price, matching how most stores ring up a sale.
- The tool assumes a single, straightforward percentage discount — it doesn't model coupon caps, minimum-spend thresholds, or store-specific rounding.
- Only one tax rate is used, so combine state, county, and city rates into one number before entering it.
Common mistakes
- Adding two discounts together: '20% off, then 10% off' is not 30% off. The second discount applies to the already-reduced price, so the combined saving is really 28%.
- Using a sales-tax rate from memory or a different region — actual local rates vary by area, so check your receipt or local rate before relying on the final price.
- Assuming the final price always taxes the original price — this calculator (like most stores) taxes the discounted price, which can differ from receipts that apply tax before the markdown.
Frequently asked questions
Is tax applied before or after the discount?
Tax is applied to the discounted price, which is how most retailers charge it.
Can I use it for stacked discounts?
Apply one discount at a time: take the sale price, then run it through again with the next percentage.
How do I calculate two stacked discounts, like 20% off then an extra 10% off?
Run the calculator twice: first apply 20% to the original price to get the sale price, then enter that sale price as the new 'original price' and apply the extra 10%. Adding the percentages together (30%) overstates the real savings.
How can I find the original price if I only know the sale price?
Divide the sale price by (1 − discount ÷ 100). For example, a $150 sale price at 25% off means the original price was 150 ÷ 0.75 = $200.
Does the final price include shipping or other fees?
No. The calculator only applies the discount and sales tax to the item price you enter; shipping, handling, and other fees aren't included.
Privacy
All processing happens locally in your browser. Your data is never uploaded.
Disclaimer: Results are estimates. Actual prices may differ due to rounding, promotions, or local tax rules.