GST / VAT Calculator
Add or remove sales tax from any amount.
Enter values
$
%
—
—
Step by step
The formula
tax = amount × rate/100 (or extracted from a tax-inclusive total)
Adding tax multiplies by (1 + rate); removing it divides by the same factor. The common mistake is subtracting the rate from a tax-inclusive price — that overshoots, because the tax was charged on the smaller pre-tax amount, not the total.
All calculations run locally in your browser and update instantly as you type.
Example calculations
Common questions this calculator answers — select one to load its values.
Related calculators
Frequently asked questions
How do I remove tax from a total?+
Divide the tax-inclusive total by (1 + rate/100). The remainder is the tax portion.
All calculations run locally in your browser. Nothing you type is sent to a server.