GST Calculator

Add GST to a price or extract GST from a GST-inclusive amount. Works for Australia (10%), NZ, UK, EU, Canada, and any custom rate.

Enter your values

$

Results

Enter your values and press Calculate.

Why use this calculator

Whether you're an Australian business adding 10% GST to an invoice, a UK trader applying 20% VAT, or a shopper reverse-engineering the tax on a receipt — this calculator handles it all. Select your country for an instant rate preset, or enter any custom GST/VAT rate you need.

How to use it

Choose whether you want to add GST to a price or remove GST from a GST-inclusive total. Enter your amount and select your country (or choose Custom to enter any rate). The calculator instantly shows the GST amount, ex-GST price, and GST-inclusive price.

The formula

Add GST: GST = Price × Rate. Total = Price + GST. Remove GST: Ex-GST = Total ÷ (1 + Rate). GST = Total − Ex-GST.

Worked examples

  • AU: $100 ex-GST at 10%

    $10 GST, $110 total

  • UK: £240 inc-VAT at 20%

    £40 VAT, £200 ex-VAT

  • NZ: $575 inc-GST at 15%

    $75 GST, $500 ex-GST

When people use it

  • Australian business invoicing with 10% GST
  • Extracting GST from a tax-inclusive receipt
  • UK / EU VAT calculations
  • Comparing prices across GST-inclusive and exclusive quotes
  • Bookkeeping and BAS preparation

Tips

  • Australia's GST is always 10% — select AU for instant results
  • To find GST in a receipt total, use Remove GST mode — never just multiply by 10%
  • The correct formula to extract GST is: Total ÷ 11 (for 10% GST)
  • Most countries display prices GST-inclusive; check invoices carefully
  • Use Custom rate for compound tax scenarios or special rates

Questions people ask

What is the GST rate in Australia?
Australia's GST rate is 10%. It applies to most goods and services. Some items are GST-free, including fresh food, medical services, and education.
How do I calculate GST from a GST-inclusive price?
Divide the total price by 11. For example, a $110 GST-inclusive price contains $10 of GST ($110 ÷ 11 = $10). Use the Remove GST mode above for any rate.
What is the difference between GST and VAT?
GST (Goods and Services Tax) and VAT (Value Added Tax) are essentially the same type of consumption tax. Australia, New Zealand, Canada, and Singapore call it GST; the UK and most of Europe call it VAT.
Is GST charged on top of the price or included?
Australian businesses can quote prices either way, but must clearly state whether prices are GST-inclusive or exclusive. Consumer-facing prices must usually be GST-inclusive.