Worked example
Add a 7.5% tax to a pre-tax price or reverse an entered tax-inclusive total to estimate its base amount.
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Tax & checkout
Sales Tax Calculator
Add sales tax to a net price or reverse-calculate the pre-tax price from a tax-inclusive total.
Enter your values
Result
Detailed breakdown
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Your result will appear here
Complete the fields and select Calculate to see a detailed answer.
Formula
How it is calculated
Add: Total = Price × (1 + Rate) · Remove: Price = Total ÷ (1 + Rate)
Frequently asked questions
What is sales tax?
Sales tax is a percentage added to the taxable selling price of goods or services.
How do I remove tax from a total?
Select “Amount includes tax”; the calculator divides the total by one plus the tax rate.
Is this the same as GST?
The arithmetic is similar, but GST rules, components, exemptions, and filing requirements can differ. Use the dedicated GST calculator for Indian GST.
Practical guidance
Use the Sales Tax Calculator with confidence
Add or remove sales tax from a price. Review the example and limitations below before using the result for an important decision.
Assumptions and limits
The estimate excludes accounting adjustments and costs not entered, such as refunds, payment fees, credits, withholding, and jurisdiction-specific rules.
How to read the result
Calculations run from the values you enter using the formula described on this page. Inputs are processed in your browser and results are rounded for display.
Calculation methodology
Read our calculation methodology Educational estimate only. Verify regulated financial, tax, employment, or legal decisions with an official source or qualified professional.