- Base amount
- GST
- GST amount
- —
- Amount before GST
- —
- Amount after GST
- —
- CGST
- —
- SGST / UTGST
- —
Figures are estimates for planning only, not investment or tax advice.
Enter an amount, pick a rate, and this calculator either adds GST to it or strips GST out of it — with the CGST and SGST halves shown separately.
Adding versus removing
To add GST: GST = amount × rate ÷ 100. To remove it from a GST-inclusive price: base = amount × 100 ÷ (100 + rate). The second one is where mistakes happen — 18% of an inclusive ₹11,800 is not ₹2,124 but ₹1,800.
The CGST/SGST split
Within a state, GST splits equally into Central GST and State GST — 18% becomes 9% + 9%. Across states, the same total is charged as a single IGST. The total the customer pays is identical either way.
Frequently asked questions
Which rate applies to my product?
Rates run 0%, 0.25%, 3%, 5%, 12%, 18% and 28% by HSN code. Check the CBIC rate finder for the exact classification.
Do I need to register for GST?
Generally above ₹40 lakh of turnover for goods and ₹20 lakh for services, with lower thresholds in special category states.
What is input tax credit?
GST you paid on business purchases can be set off against GST you collect, so you remit only the difference.
Related calculators
See allRead next
Every charge on an equity trade, and why small trades rarely pay
Brokerage is the smallest line on most contract notes. Here is the rest of it.