Sales Tax Calculator
Add sales tax or VAT to a price, or extract the tax from a tax-inclusive total.
100% private — everything runs in your browser
How to Use
- 1
Choose “Add tax” to work from a pre-tax price, or “Extract tax” for a tax-inclusive total.
- 2
Enter the amount and the tax rate — the presets are a quick start.
- 3
The net amount, tax and gross total are shown side by side.
Examples
Adding 8.25% to 100
Input
Add tax · 100 · 8.25%Output
Tax 8.25 · total 108.25Extracting 8.25% from 108.25
Input
Extract tax · 108.25 · 8.25%Output
Net 100.00 · tax 8.25FAQ
What is the difference between the two modes?
“Add tax” multiplies the amount by the rate. “Extract tax” divides the gross total by 1 + rate, which is the correct reverse calculation used for VAT-inclusive prices.
Can I use this for VAT?
Yes. The maths is the same for sales tax, VAT and GST — only the name and the rate differ.
Why do the net and tax not add up exactly?
Each figure is rounded to cents independently. When extracting, the tax is derived from the unrounded net amount, so the displayed values can differ from the total by one cent.