Sales Tax Calculator
Calculate a price plus tax or remove included tax from a total.
- Before tax
- $5000.00
- Tax amount
- $412.50
- Total
- $5412.50
How the Sales Tax Calculator Works
Use this calculator to add sales tax to a before-tax price or extract the tax from a tax-inclusive total. It answers searches such as “5000 plus tax” without mixing sales tax with income-tax estimates.
Formula
Tax = price x rate / 100. Price including tax = price + tax. For a tax-inclusive total, pre-tax price = total / (1 + rate / 100).
Example
At an 8.25% rate, $5,000 plus tax is $5,412.50: the sales tax is $412.50.
Limitations
Sales-tax rates and product exemptions vary by country, state, city and item. Enter the rate that applies to the transaction.
How to use the result responsibly
- Check that every input uses the unit and time period shown beside the field.
- Compare the result with the worked example and formula above.
- For financial, tax, health, or legal decisions, confirm current rules with a qualified professional or the relevant authority.
Frequently Asked Questions
How much is tax on a purchase?
Multiply the before-tax price by the local sales-tax rate, then divide by 100.
How do I remove tax from a total?
Divide the tax-inclusive total by 1 plus the tax rate as a decimal.
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Editorially reviewed August 18, 2026. Read our calculation methodology and editorial policy.