GST Calculator
Add or remove GST at any rate to find the net price, GST amount and gross total — fast and accurate.
UK VAT applies to most goods and services. The standard rate is 20%. Some items qualify for reduced or zero rates.
Enter an amount to see the breakdown.
Region notes
About the GST Calculator
Goods and Services Tax (GST) is a broad consumption tax used in countries including Australia, New Zealand, India, Canada and Singapore. Like VAT, it requires moving cleanly between the price before tax, the GST amount, and the GST-inclusive total. This GST calculator handles both directions: add GST to a base price, or back it out of a GST-inclusive figure to reveal the original amount and the tax included.
The common pitfall is removing GST. To take a 10% GST out of a GST-inclusive price you divide by 1.10 — subtracting 10% gives the wrong answer, because the tax was added to the smaller pre-GST figure. The calculator applies the correct formula, so the net and GST values are accurate for invoicing, claiming credits, and filing returns.
Because GST rates differ by country, the tool lets you enter any rate or use a preset, making it useful for businesses, contractors and shoppers wherever GST applies. It calculates instantly in your browser and saves nothing you enter.
Looking for more options? Open the full VAT & Sales Tax Calculator — it’s the same tool with every feature.
Frequently Asked Questions
How do I add GST to a price?
Multiply the base price by one plus the GST rate as a decimal. For example, adding 10% GST to $200 gives $200 × 1.10 = $220, including $20 of GST. The calculator shows the net price, GST amount and gross total together.
How do I remove GST from a GST-inclusive price?
Divide the inclusive price by one plus the GST rate. To remove 10% GST from $220, divide by 1.10 to get $200, leaving $20 of GST. Subtracting 10% would be incorrect — the calculator uses the right method automatically.
Is GST the same as VAT?
They work in very similar ways — both are consumption taxes applied to goods and services and collected in stages through the supply chain. The name differs by country (GST in Australia, India, Canada and others; VAT in the UK, EU and many more), but the add and remove calculations are identical, which is why this tool handles both.
Understanding GST
What GST is
Goods and Services Tax is a value-added consumption tax charged on most goods and services. Registered businesses add GST to their sales and can usually claim back the GST they pay on business purchases, remitting the difference to the tax authority. The end consumer ultimately bears the tax. This makes accurate separation of the net price and the GST component important for every business transaction.
Adding versus removing GST
Adding GST moves from a pre-tax price to a GST-inclusive total by multiplying by one plus the rate. Removing GST reverses it by dividing by one plus the rate — the step people most often get wrong by mistakenly subtracting the percentage. Getting this right ensures invoices, expense claims and returns reconcile correctly.
GST rates by country
GST rates and rules vary: Australia and New Zealand use a single broad rate, while countries like India apply multiple GST slabs depending on the product or service. Some items are GST-free or exempt. Because of these differences, a calculator that accepts any rate lets you compute the correct figure for your specific country and product category.