CostDiscount Calculator
Calculate sale price, amount saved and final price after an optional tax percentage.
Enter your values and press Calculate.
Tip: country presets are starting points only. Replace rates and prices with your actual figures whenever possible.
How this calculator works
The discount is applied to the original price first. If a tax percentage is entered, it is then applied to the discounted sale price.
Formula
A 25% discount on $120 reduces the price by $30 to $90 before tax.
Getting a more accurate result
- Check whether local tax is applied before or after discounts.
- For stacked discounts, calculate them sequentially rather than adding percentages.
- Use 0% tax if tax is already included in the displayed price.
Understanding your result
The result is intended for comparison and planning. Real-world costs can differ because of local taxes, fees, tariffs, financing, usage patterns, equipment efficiency, rounding and other conditions. For important decisions, verify the inputs against your bill, contract, lender, employer or other authoritative source.
Frequently asked questions
Is 20% off then 10% off the same as 30% off?
No. Sequential discounts multiply, so 20% then 10% equals a 28% total reduction.
Can I calculate tax too?
Yes. Enter the tax percentage to estimate the final checkout price.
What if tax is included in the sticker price?
Leave the tax field at zero.
Discount examples for common shopping situations
For a single discount, multiply the original price by the discount rate to find the savings, then subtract the savings from the original price. A $240 item at 15% off saves $36 and costs $204 before tax. If 8% sales tax applies after the discount, the estimated checkout total is $220.32.
Stacked discounts are applied one at a time
A second discount usually applies to the already-reduced price. For example, 20% off followed by another 10% off turns a $100 price into $80 and then $72. The combined saving is 28%, not 30%. To model this calculator, run the first discount, then use its sale price as the original price for the second calculation.
Discount, coupon and tax checklist
- Confirm whether a coupon applies to sale items or only to the regular price.
- Check whether shipping, service fees or deposits are excluded from the discount.
- Use the tax rate that applies to the purchase location and item type.
- Compare the final checkout total—not just the advertised percentage—between stores.
Discount versus percentage change
A discount is measured from the original price. Percentage change also uses an original value, but it can describe either an increase or a decrease. When you know both the old and new prices but not the advertised discount, use the percentage change calculator.
Related calculators and guides
Reviewed for CostMeter V1.5 • September 2026