Calculate GST amount and final price for a given rate quickly and accurately.
Google AdSense Banner
This area will contain advertisements after approval.
Google AdSense Banner
This area will contain advertisements after approval.
When your amount doesn't yet include GST, the GST formula to add GST is: GST amount = Price × (GST Rate ÷ 100), and the total price is the original price plus that GST amount. For example, a price of 1000 with 18% GST gives a GST amount of 180, for a GST-inclusive total of 1180.
When your amount already includes GST, the base price (GST-exclusive amount) is calculated by dividing by (1 + GST Rate ÷ 100), not by simply subtracting the percentage. For example, 1180 (GST-inclusive at 18%) divided by 1.18 gives back exactly 1000 as the base price, with 180 as the GST portion, this reverse GST calculation is a common source of confusion.
Subtracting the GST percentage directly from a GST-inclusive amount instead of dividing by (1 + rate ÷ 100), as the explanation above shows, this produces the wrong base price.
Applying the wrong mode, using 'Add GST' on an amount that already includes tax double-counts the GST portion.
Assuming the GST rate is the same for every product category, many GST systems apply different rates (or exemptions) to different goods and services.
Use 'Add GST' when your amount does not yet include GST, and you want to find the GST amount and the final total.
Use 'Remove GST' when your amount already includes GST, and you want to find the original base price before GST was added.
The math is identical, add or remove a percentage-based tax, just under a different regional name. Use our VAT Calculator if that's the terminology used where you are (UK, EU and others), this GST Calculator if you're in India, Australia, Canada or another GST country.
Sales Tax, VAT and GST: Same Idea, Different Machinery
They all add a percentage to a purchase price, but sales tax, VAT and GST calculate and collect that tax in genuinely different ways.
GST: Adding vs Removing Tax From a Price, Explained
Adding GST to a price and removing GST from a price use two different formulas, not just one in reverse. Here's why.
Google AdSense Banner
This area will contain advertisements after approval.