CDConvertibleData
Finance calculator

Sales Tax Calculator

Add a sales-tax percentage to a pre-tax price and see the tax amount and final total.

✓ Tested formula✓ Instant result✓ Private by design
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Enter your valuesResults update instantly as you type.

✓ Your numbers stay on this device.

Understand the answer

Formula and method

FormulaTotal = price × (1 + tax rate ÷ 100).

Sales tax is calculated as a percentage of the entered taxable price and then added to that price.

Worked example

A 120 item at 8.25% tax costs 129.90 in total.

How to use this calculator

  1. Enter the values using the labels and units shown.
  2. Review the live result and supporting details.
  3. Check the formula, example and assumptions before using the answer.

Assumptions and limits

  • The entire price is taxable.
  • Jurisdiction-specific exemptions and compound taxes are excluded.

Reference

Formula reviewed 2026-07-15

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