Formula and calculation method
Before-tax price × (1 + rate) = total. For inclusive prices: base = total / (1 + rate).
Enter the rate applicable to your region and product. No tax rates are preloaded as current law.
How to use sales tax calculator
- Set Price. The example below uses 100.
- Set Tax rate (%). The example below uses 20.
- Set Price basis by choosing the option that matches your calculation.
- Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.
Worked example
Example inputs
- Price
- 100
- Tax rate (%)
- 20
- Price basis
- Before tax
- Before-tax price
- 100
- Tax
- 20
- Total
- 120
Factors affecting your result
Enter the rate applicable to your region and product. No tax rates are preloaded as current law.
Changing price changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.
Frequently asked questions
How does the sales tax calculator work?
Before-tax price × (1 + rate) = total. For inclusive prices: base = total / (1 + rate).
What inputs does Sales Tax Calculator need?
Enter price, tax rate (%), price basis. Read the unit labels; percentages are entered as ordinary percentages, not decimal fractions.
How should I interpret the sales tax calculator result?
Enter the rate applicable to your region and product. No tax rates are preloaded as current law.
Are my sales tax calculator inputs uploaded?
No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.
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