Sales Tax Calculator
Add sales tax or find the pre-tax price from a tax-inclusive total.
What this calculator does
Calculate tax and totals in either direction using a sales tax percentage you provide.
Inputs and what they mean
- Calculation
- — choice value.
- Amount
- — number value.
- Sales tax rate
- — number value.
How to use it
- Choose whether to add tax or remove included tax.
- Enter the amount and tax rate.
- Read the tax and total or pre-tax amount.
Formula
Added tax = pre-tax amount × rate ÷ 100. Reverse tax divides the inclusive total by (1 + rate ÷ 100).
Worked example
Add 8.25% tax to $100
Tax is $8.25 and the total is $108.25.
Reading the result
The headline figure is the main answer. Any breakdown underneath shows the parts that make it up, so you can check the working and see what changes when you adjust an input.
Limitations and assumptions
Results depend entirely on the figures you enter and are rounded for display. They are for general information and education, not professional advice.
Common questions
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