Double Discount Calculator
Stacked discounts and the real saving.
Enter your values
ⓘ Live results
Results
- Final price
- $67.20
- Price before tax
- $67.20
- You save
- $52.80
- Effective discount
- 44%
- Naive sum of discounts
- 50%
Quick answer
Stacked discounts multiply rather than add — 30% off then 20% off is 44% off, not 50%.
Final = P × (1 − d1) × (1 − d2)
How to use the Double Discount Calculator
- 1Enter the original ticket price.
- 2Enter both discount percentages.
- 3Add sales tax if you want the checkout total.
Worked example
Using the values the calculator loads with:
Inputs
- Original price120 $
- First discount30 %
- Second discount20 %
- Sales tax0 %
Results
- Final price$67.20
- Price before tax$67.20
- You save$52.80
- Effective discount44%
- Naive sum of discounts50%
Frequently asked questions
Why isn't 30% + 20% equal to 50%?
The second discount applies to the already-reduced price, so it removes less money.
Does order matter?
No — multiplication is commutative, the final price is identical either way.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.