Sales Tax Calculator
Switch between adding tax and removing it from a total.
Your numbers
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%
Your results
Price before tax
Price before tax
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Sales tax
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Total with tax
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Sales Tax Calculator by TheCalcTools
How the Sales Tax Calculator works
Enter the amount and your local sales tax rate.
Choose whether the amount already includes tax.
The calculator returns the pre-tax price, the tax and the total.
The formula
Total = price × (1 + rate)Price = total ÷ (1 + rate)
Worked example
Using the default values shown in the calculator:
| Amount | $80 |
|---|---|
| Sales tax rate | 8.25 % |
| Amount is | Before tax |
- Tax = $80 × 8.25% = $6.60.
- Total = $86.60.
Result:
| Price before tax | $80.00 |
|---|---|
| Sales tax | $6.60 |
| Total with tax | $86.60 |
Frequently asked questions
What sales tax rate should I use?
Use the combined state, county and city rate for the place of sale. Check with your tax authority, as rates change and some goods are exempt.
Why not just subtract the tax rate from a total?
Tax is charged on the pre-tax price, so dividing by (1 + rate) is the correct way back.
Sources and further reading
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This calculator gives estimates for information only. Check important results independently before you rely on them. See our disclaimer.