GST Calculator
Add or remove GST from any amount at any rate.
Enter your details
How it is calculated
Removing GST: Base = Total × 100 ÷ (100 + Rate); GST = Total − Base. For an intra-state supply the GST splits equally into CGST and SGST; for an inter-state supply the whole amount is IGST.
Worked example
Base ₹10,000 at 18%: GST = ₹1,800, total = ₹11,800. Going the other way, ₹11,800 including 18% GST: base = 11,800 × 100 ÷ 118 = ₹10,000.
About the GST Calculator
Add or remove GST from any amount at any rate. This free gst tool runs entirely in your browser: nothing you type is sent to a server, and you can save, print or download the result.
What you need to enter
You will be asked for amount, what is the amount?, gst rate, custom gst rate (%) — used only if "custom rate" is selected. Fields marked * are required. Every field shows a hint and the allowed range.
How to use it
- Fill in the inputs (sample values are pre-filled so you can see how it works).
- Press Calculate to see the result, breakdown and chart.
- Use Print, Download PDF or Share to keep the result, or come back to it from your saved history.
Who it helps
Salaried individuals, business owners, investors and professionals who want a quick, transparent estimate before they file, invest or plan. If your case has special facts, our team can review it - ask for a consultation.
Results are estimates based on the rules and rates described under "How it is calculated". Laws change and individual facts differ, so confirm with official sources or a qualified professional before acting. This is not tax, legal or investment advice.
Frequently asked questions
Which GST rate should I choose?
The rate depends on the HSN (goods) or SAC (services) code of what you supply. Since the September 2025 rationalisation most items fall in 5% or 18%, with 40% for a short list of sin and luxury goods. Check the rate notification on cbic-gst.gov.in or ask your accountant if unsure.
Why are 12% and 28% still in the list?
They were slabs until 21 September 2025 and are kept, clearly labelled, so you can check or reconcile older invoices. They should not be used for new supplies unless a notification specifically says so.
Does the calculator include compensation cess?
No. Where a cess still applies, add it separately using the rate in the notification.
Need help beyond the calculator?
Talk to our tax and compliance team for advice based on your documents.