Sales Tax Calculator
Add sales tax to a price and see the tax amount and final total.
Inputs
Total (with tax)
$108.25
Sales Tax
$8.25
Step by step
Pre-tax price
= $100.00
Calculate the tax amount: Tax = Price × Rate
$100.00 × 8.25%
= $8.25
Add tax to the price: Total = Price + Tax
$100.00 + $8.25
= $108.25
How it works
Sales tax is calculated as the price multiplied by the tax rate. The final total is the original price plus that tax amount.
Formulas
Tax amount
Tax = Price × Rate
- P
- Pre-tax price
- r
- Tax rate (decimal)
Total price
Total = Price + Tax = Price × (1 + Rate)
- Total
- Final price including tax
Estimates only. Confirm the exact applicable tax rate for your location.
Frequently Asked Questions
How do I find my sales tax rate?
Combine your state, county, and city rates. Many U.S. localities publish a single combined rate you can enter directly.
Can I work backwards from a total?
To find the pre-tax price from a total, divide the total by (1 + rate). For example, a $108.25 total at 8.25% is $108.25 / 1.0825 = $100.