🧾 Sales Tax Calculator
Shelf prices and checkout totals rarely match because of sales tax or VAT. This calculator handles both directions: add tax on top of a net price, or work backwards from a tax-inclusive price to find the tax hidden inside it.
Enter your local rate as a percentage — the calculator itself is generic and works for any country's sales tax, GST or VAT.
How to use this calculator
Enter a price and a tax rate, then choose whether to add tax on top of a net price or extract the tax already hidden inside a gross price.
- Enter the Price you want to work with.
- Type the Tax rate as a percentage.
- Choose Add tax to net price or Extract tax from gross price from the Calculation dropdown.
- Press Calculate to see the tax amount alongside the net and gross figures.
Frequently asked questions
What are the two calculation modes?
Add mode takes a tax-free net price and adds the tax to give the checkout total. Extract mode takes a tax-inclusive gross price and works backwards to reveal the net price and the tax hidden inside it.
How is the maths done?
In add mode, tax equals price times the rate. In extract mode, the net price equals the gross price divided by one plus the rate, and the tax is the difference between the two.
Show me both modes in action.
A $100 net price at 8.5% in add mode gives $8.50 of tax and a $108.50 total. Enter $108.50 in extract mode at the same rate and you get back the $100 net price with $8.50 of tax identified.
Does it work for VAT or GST?
Yes. The tool is generic: enter any country's sales tax, VAT or GST rate as a percentage and it handles both directions the same way.