Calculator
Sales Tax Calculator
Estimate sales tax amount and total price from a pre-tax price and sales tax rate.
Result
Sales tax amount
$8.25
Total price including tax
$108.25
How to use this calculator
What this calculator does
Estimate sales tax amount and total price from a pre-tax price and sales tax rate.
How to use it
Enter your pre-tax price and sales tax rate, then review the result, formula, example, and FAQs below. Try a few scenarios to see which inputs move the result most.
What the result means
Use the result as a direct calculation from the values you entered. If it looks off, check the inputs and formula shown on this page.
Browse more business calculators for related estimates and comparisons.
Business results are estimates for planning and education. They are not business, legal, tax, employment, accounting, or financial advice.
Scenario guidance
When to use this
Use this when estimating the final price of a purchase or invoice after a simple sales tax rate is applied.
Example scenario
A seller is checking the estimated total on a $100 item before adding it to an invoice or checkout estimate.
Inputs that usually matter most
- Pre-tax price, because tax is calculated from that amount.
- Sales tax rate, which should match the rate you want to estimate.
- Whether the item is taxable, because exemptions and local rules can change the actual tax.
Common mistake to avoid
Do not assume one tax rate applies to every item, location, buyer, or business type.
How to interpret the result
Use the sales tax amount and total price as simple estimates, then confirm local rules, exemptions, and business-specific tax treatment separately.
Results are estimates for planning and education. They are not tax, legal, accounting, or financial advice.
Formula
The calculator multiplies the pre-tax price by the sales tax rate, then adds the tax amount to the pre-tax price.
Example sales tax
A $100 pre-tax price with an 8.25% sales tax rate adds $8.25 of tax, for a total price of $108.25.
Frequently Asked Questions
Does this handle local exemptions?
No. Actual sales tax treatment can vary by location, item type, buyer status, exemptions, business type, and local rules.
Can I use this for invoices?
Use it only as an estimate. Confirm the correct rate, taxable amount, exemptions, and reporting rules for the specific sale.