GST Exclusive Calculator
Add GST on top of a base price to get the invoice total.
Enter your details
How it is calculated
Worked example
5 units at ₹2,000 with a 10% trade discount at 18% GST: gross ₹10,000, discount ₹1,000, taxable ₹9,000, GST ₹1,620, invoice total ₹10,620.
About the GST Exclusive Calculator
Add GST on top of a base price to get the invoice total. 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 base price per unit (excl. gst), quantity, trade discount before gst (%), gst rate, custom gst rate (%) — used only if "custom rate" is selected. Optional switches: round the invoice total to nearest rupee. 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
Is the discount given before or after GST?
A discount recorded on the tax invoice at the time of supply reduces the taxable value, so GST is charged on the lower amount. Post-sale discounts have separate conditions under section 15(3) of the CGST Act.
Should I round the invoice total?
Rounding is optional on the invoice; the GST return figures are generally taken as per the tax shown. Use the round-off line only if your billing practice does so.
Need help beyond the calculator?
Talk to our tax and compliance team for advice based on your documents.