About the GST / VAT Calculator
Add VAT, GST or sales tax to a price, or remove it from a tax-inclusive price. The standard rate for 70 countries — from the UK, EU and India to Australia, Japan, Mexico and South Africa — is built in, and your own country is picked automatically. Reduced rates, US state sales taxes and anything else can be entered as a custom rate.
Useful for invoicing, pricing and checking receipts.
How does the GST / VAT Calculator work?
Adding tax multiplies the net price by (1 + rate). Removing tax divides the gross price by (1 + rate) — you can’t simply subtract the rate from a tax-inclusive price.
For Australia’s 10% GST, the GST included in a price is one-eleventh of the total.
GST / VAT Calculator formula
tax-inclusive = net × (1 + r)
net = gross ÷ (1 + r)
tax included = gross × r ÷ (1 + r)Example
$100 + 10% GST = $110.
GST included in $110 = $110 ÷ 11 = $10.
£240 including 20% VAT = £200 + £40 VAT.