GST in India Explained: Rates, Formula & Examples
By calculatorfc.online Editorial Team · Updated 2026-05-25
What is GST?
Goods and Services Tax (GST) is a single indirect tax levied on the supply of goods and services in India, replacing many earlier taxes.
Common GST slabs
India uses several rate slabs — commonly 5%, 12%, 18% and 28% — depending on the type of goods or services.
Adding GST to a price
GST amount = price × rate ÷ 100, and final price = price + GST. For ₹1,000 at 18%: GST = ₹180, total = ₹1,180.
Removing GST from a total
If a price already includes GST, base price = total ÷ (1 + rate/100). From ₹1,180 at 18%: 1180 ÷ 1.18 = ₹1,000.
Why use a GST calculator
It removes the guesswork of inclusive vs exclusive pricing and instantly shows the base amount, GST and total.
Try the calculator
Skip the manual math — use our free GST Calculator to get instant results.
FAQ
Is GST added on top of the price?
It depends. Exclusive pricing adds GST on top; inclusive pricing already contains it. A GST calculator handles both.
What is the most common GST slab?
18% is the most widely applied slab for many goods and services.