Sales Tax Calculator
Calculate sales tax and total price, or work backward from a total.
Total Price
108Tax Amount
8
Pre-Tax Price
100
Related Guide
Sales Tax Calculator: Forward and Reverse Math Explained
About This Tool
Free sales tax calculator — enter a price and tax rate to instantly calculate the tax amount and total price, or switch to reverse mode to work backward from a tax-included total to find the pre-tax price and tax amount. Sales tax rates vary widely by state, county, and city, so a single national rate rarely applies — this tool lets you enter whatever local rate applies to your calculation. The reverse mode is especially useful for receipts or invoices that only show a final total: enter that total and the known tax rate to see exactly how much was tax versus the original price. Runs entirely in your browser — nothing is uploaded or saved.
How to Use
- 1
Enter the price and tax rate
Type the pre-tax price and your local sales tax rate as a percentage.
- 2
See tax and total
View the tax amount and the final total price instantly.
- 3
Switch to reverse mode if needed
Enter a tax-included total instead to back-calculate the pre-tax price and tax amount.