Finance
Sales Tax Calculator
Calculate sales tax both ways. Enter a pre-tax amount and rate to get the tax and total, or switch to reverse mode to pull the net price and tax out of a tax-inclusive total. Perfect for receipts, invoices and quick pricing checks — all client-side.
Examples
Input · 100 × 8.25 ÷ 100 = 8.25
Amount $100, tax rate 8.25%, Add mode
Output
Net $100.00, Tax $8.25, Total $108.25
How to use Sales Tax Calculator
Pick a mode
Choose Add tax to add tax to a net amount, or Extract tax to break down a tax-inclusive total.
Enter the numbers
Type the amount and the tax rate as a percentage.
Read the breakdown
See the net price, tax amount and total side by side.
Why use this tool
Add tax or reverse-extract it from a total
Handles any tax or VAT rate
Clear net, tax and total breakdown
Runs fully in your browser — nothing is uploaded
Frequently asked questions
In Extract mode the amount you enter is treated as the tax-inclusive total. Net = total ÷ (1 + rate ÷ 100), and tax = total − net.
Yes. The calculation is the same for any percentage-based sales tax, VAT or GST — just enter the applicable rate.
Discussion
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