GST / VAT Calculator
Add tax to a net amount or extract tax from a gross price. Supports any rate with quick-select presets for the most common GST and VAT rates worldwide. Runs entirely in your browser.
Enter an amount and tax rate to calculate your GST or VAT.
How the GST / VAT Calculator Works
- 1Choose Add Tax (price before tax) or Remove Tax (price already includes tax).
- 2Enter the amount and select your tax rate — or click a preset button for common rates.
- 3Hit Calculate to see the tax amount, net price, and gross total with a visual breakdown.
- 4Use the breakdown table to verify figures for invoices, quotes, or receipts.
GST vs VAT — Are They the Same?
GST (Goods and Services Tax) and VAT (Value Added Tax) are functionally equivalent consumption taxes — both are applied at each stage of the supply chain with the end consumer bearing the final cost. The naming convention differs by country: Australia, Canada, New Zealand, Singapore, and India use GST; most of Europe and the UK use VAT. The calculation method is identical, so this tool handles both.
Tax Calculation Tips
Always check the applicable rate
Most countries have reduced rates for essentials like food and medicine. Using the standard rate on exempt or reduced-rate goods will over-charge your customers.
Use Remove Tax for retail receipts
When a receipt shows the tax-inclusive total and you need to know the net, use the Remove Tax mode. This is the standard reverse GST / VAT calculation used in accounting.
Rounding on invoices
Tax authorities in some jurisdictions require rounding per line item rather than on the invoice total. When in doubt, consult your local tax guidance — small rounding differences can trigger compliance flags.
Compound taxes
Some goods attract both a federal and a state/provincial tax. Apply them sequentially: calculate federal tax first, then apply state tax to the federal-inclusive total, or vice versa depending on local rules.
Frequently Asked Questions
How do I add GST or VAT to a price?
Tax Amount = Price × (Tax Rate / 100). Total = Price + Tax Amount. For example, $100 at 10% GST: tax = $10, total = $110. The calculator does this automatically in "Add Tax" mode.
How do I remove GST or VAT from a price (reverse calculation)?
Net Amount = Gross Price / (1 + Tax Rate / 100). Tax = Gross − Net. For example, a $110 price including 10% GST: net = $110 / 1.1 = $100, tax = $10. Use "Remove Tax" mode for this.
What is the difference between tax-inclusive and tax-exclusive pricing?
Tax-exclusive pricing (ex-tax) shows the price before tax is added — common in B2B invoices. Tax-inclusive pricing (inc-tax) is the final consumer-facing price with tax already included. Use "Add Tax" for ex-tax amounts and "Remove Tax" to extract the net from a tax-inclusive price.
Which tax rate should I use?
Use the standard rate for your jurisdiction: Australia GST is 10%, UK VAT is 20%, EU VAT rates range from 17% to 27%, India GST rates are 5%, 12%, 18%, or 28%. The calculator includes quick-select buttons for the most common rates.
Can this calculator handle multiple tax rates?
The tool calculates one tax rate at a time. For compound taxes (e.g. a federal rate plus a state rate), apply them sequentially using the result of the first calculation as the input for the second.
Is this tool suitable for invoicing?
It is useful for verifying invoice amounts quickly. For formal invoicing, always confirm the applicable rate and rounding rules for your jurisdiction, as tax authorities sometimes specify whether to round per line item or on the total.