How to use this discount calculator
Enter values from the same reporting period and use consistent definitions. Then select Calculate. The tool performs the calculation locally in your browser and shows the result immediately.
Formula
Sale Price = Original Price × (1 − Discount %)
Example
A 15% discount on $120 saves $18 and produces a sale price of $102.
What this metric tells you
Discount math is simple, but promotion planning should also consider margin. A percentage discount reduces revenue immediately while many costs remain unchanged.
How to interpret the result
- Check post-discount contribution margin before launching a promotion.
- Stacked discounts are usually multiplicative, not simply additive, unless your platform specifically applies them that way.
- Use clear original and sale prices to avoid confusing customers.
Important: Calculators provide estimates based on the inputs you supply. They do not replace platform reporting, accounting records, tax advice or professional financial analysis.
Frequently asked questions
How do I calculate 20% off?
Multiply the original price by 0.20 to find the savings, then subtract that amount from the original price.
Are two 10% discounts equal to 20% off?
Not if applied sequentially. Two sequential 10% discounts produce a 19% total reduction from the original price.
Does this include tax?
No. It only calculates the stated price discount. Taxes depend on your checkout and jurisdiction.