How to use this calculator
Calculate a discounted price with entered tax. Enter original price ($), discount (%), sales tax (%). The result updates when you change an input. To compare two sets of inputs, save scenario A, then enter the second set; the result panel shows the difference.
Formula and limits
Final price = original × (1 − discount ÷ 100) × (1 + tax ÷ 100). Tax is applied after discount. This does not look up local tax rules.
Worked example
The following example uses the calculator’s starting values. It is an illustration of the method, not a recommended target.
| Input | Example value |
|---|---|
| Original price ($) | 100 |
| Discount (%) | 20 |
| Sales tax (%) | 6 |
Final price: $84.80
Pre-tax savings: $20.00
Interpreting your result
Treat the output as a planning estimate. Enter your own current rates and costs; defaults are examples, not current offers. Taxes, fees, variable rates, and lender conventions may change the actual outcome.
Comparing alternatives
Save the first result as scenario A, then change one input. The comparison shows the numeric difference; it does not label either result as better. Choose inputs that describe realistic alternatives. Values shown on screen are rounded, so calculations from rounded intermediate results may differ slightly.
Background reading
Investor.gov financial tools. This is a subject reference, not an endorsement or independent review of Calcaven.