GST Calculator
Add GST to a price, or work out how much GST is already included in one.
Calculate GST
Enter an amount, the GST rate, and whether it should be added or removed.
Result
Total amount
-
Base amount
-
GST amount
-
Formula used
Add: GST = amount × rate ÷ 100. Remove: Base = amount ÷ (1 + rate ÷ 100)
Example: ₹1,000 + 18% GST = ₹1,180 total (₹180 GST). ₹1,180 including 18% GST = ₹1,000 base (₹180 GST).
How to use this calculator
- Enter the amount and GST rate.
- Choose whether the amount excludes GST (add it) or already includes GST (remove it).
- Press Calculate to see the base amount, GST amount and total.
FAQ
Frequently asked questions
How do I add GST to a price?
Multiply the price by the GST rate to get the tax amount, then add it to the price: GST amount = price × rate ÷ 100, total = price + GST amount.
How do I remove GST from a price that already includes it?
Divide the inclusive price by (1 + rate/100) to get the base price, then subtract that from the inclusive price to get the GST amount.
What are the common GST rate slabs in India?
Common slabs are 5%, 12%, 18% and 28%, though this calculator works with any custom rate you enter.
Does this calculator file GST returns?
No, it only calculates the tax amount and totals for a single price — it does not file returns or handle input tax credit.