How do you extract sales tax from total price?

Pre-tax price = Total Price / (1 + Tax Rate / 100). Tax Amount = Total Price - Pre-tax Price.

Does this calculator automatically find my local tax rate?

No, tax rates are user-entered as local sales tax rules vary across locations.

Finance CalculatorsClient-Side Calculation Engine

Sales Tax Calculator

Calculate tax amount, total price, or extract pre-tax price.

Calculator Inputs
Instant Math

Mode

Pre-Tax Price

Sales Tax Rate (%)

Results & Calculation SummaryVerified

Sales Tax Amount

$10.00

At a tax rate of 10%, adding tax to $100.00 gives $10.00 in sales tax for a total of $110.00.

Pre-Tax Price

$100.00

Total Price Incl. Tax

$110.00

What is Sales Tax Calculator and How is it Calculated?

The CalcTower Sales Tax Calculator calculates sales tax dollars and total purchase price, or reverse-calculates pre-tax price from inclusive receipts.

Worked Calculation Examples

10% Sales Tax Purchase

Input:Price: $100.00 | Tax Rate: 10% | Add Tax

Output:Tax: $10.00 | Total Price: $110.00

10% tax on $100 is $10 for $110 total.

Common Real-World Use Cases

Budgeting a Purchase Including Tax

Find the total out-the-door price of an item before checkout by adding your local tax rate.

Reading a Receipt Backwards

Extract the pre-tax price and exact tax amount from a total that already includes sales tax.

How to Use the Sales Tax Calculator

1Enter Price.
2Enter local Tax Rate (%).
3Select calculation mode: "Add Tax to Price" or "Extract Tax from Total".
4View tax amount and final price.

Pro Tips & Suggestions

•Tax rates vary by state, county, and city jurisdiction.

Common Mistakes to Avoid

•Leaving the calculator on the wrong mode - "Add Tax to Price" expects a pre-tax price and adds tax on top, while "Extract Tax from Total" expects a tax-inclusive total and works backward; using the wrong mode for your number gives an incorrect result.