Sales Tax Calculator
Calculate the total cost including sales tax, tax amount, and effective tax rate for any purchase. Enter the pre-tax price and the sales tax rate to get instant results.
Published by:
isCalculator Editorial Team
Was this calculator helpful?
How to use this tool?
This calculator computes the total price including sales tax. Follow these steps:
- Enter the Pre-tax Price – Input the item's cost before tax (e.g.,
100.00). Must be a non-negative number. - Enter the Sales Tax Rate – Input the tax percentage (e.g.,
8.5for 8.5%). Must be between 0 and 100. - Click "Calculate" – The form validates your inputs. If invalid, error messages appear.
- View Results – Three outputs are displayed:
- Tax Amount – The tax added (Pre-tax Price × Tax Rate / 100).
- Total Price – Final cost including tax.
- Effective Tax Rate – Tax as a percentage of the total price.
Note: All monetary values are in US dollars ($). Use decimal points for cents (e.g., 19.99).
Previous Results
| Result | Inputs | Date |
|---|
Frequently Asked Questions
Sales tax is calculated by multiplying the pre-tax price by the tax rate (as a decimal). For example, a $100 item with an 8% tax rate results in $8 tax, total $108.
The effective tax rate is the tax amount divided by the total price (including tax), expressed as a percentage. It shows the proportion of tax in the final price.
Yes, the calculator uses a dollar sign but you can treat the input as any currency. The calculations remain the same.
