GST / VAT Calculator
Calculate GST or VAT amounts instantly. Add tax to a net price or extract tax from a gross price for any GST or VAT rate worldwide.
Results
How to Use This Tool
- Enter the amount you want to calculate tax on.
- Choose a preset tax rate (Australia GST, UK VAT, Canada GST, etc.) or enter a custom rate.
- Choose "Add Tax to Price" if your amount is a net (tax-exclusive) price, or "Extract Tax from Price" if your amount already includes tax.
- Review the net price, tax amount, and gross price.
Formula & How It Works
Adding Tax (Exclusive Mode)
Gross Price = Net Price × (1 + Tax Rate / 100)Use this when your entered amount does not yet include tax, and you want to find the final price.
Extracting Tax (Inclusive Mode)
Net Price = Gross Price ÷ (1 + Tax Rate / 100); Tax Amount = Gross Price − Net PriceUse this when your entered amount already includes tax, and you want to back out the net price and the tax portion.
Practical Examples & Common Use Cases
Example: Add 10% GST to a $100 net price (Australia)
Gross Price = $100 × (1 + 10/100) = $100 × 1.10 = $110.00. The GST amount is $10.00.
Example: Extract 20% VAT from a £120 gross price (UK)
Net Price = £120 ÷ 1.20 = £100.00. VAT Amount = £120 − £100 = £20.00.
Example: Add 18% GST to a $500 net price (India)
Gross Price = $500 × (1 + 18/100) = $500 × 1.18 = $590.00. The GST amount is $90.00.
Frequently Asked Questions
GST (Goods and Services Tax) and VAT (Value Added Tax) are functionally the same — both are consumption taxes on goods and services. The name varies by country: Australia, Canada, India, and New Zealand use GST, while the UK and EU use VAT.
Multiply the net price by (1 + tax rate). For example, to add 10% GST to $100: $100 × 1.10 = $110. The GST amount is $10.
Divide the gross price by (1 + tax rate) to get the net price, then subtract. For 20% VAT on £120: £120 ÷ 1.20 = £100 net, so the VAT is £20.
Use the rate for your country or the country where the sale occurs. Common rates: Australia 10%, UK 20%, Canada 5% (federal GST), EU 19-27%, New Zealand 15%. Some goods may have reduced or zero rates.
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