Add GST to your price or remove GST from an inclusive amount. Works for 5%, 12%, 18%, 28% and custom rates — with CGST + SGST breakdown.
Whether you are quoting a price to a customer, checking how much GST is buried inside a supplier's bill, or working out the tax component of an MRP, our free GST calculator does the maths instantly. Switch between Add GST (price excludes GST) and Remove GST (price includes GST) modes, pick the applicable slab — 0%, 0.25%, 3%, 5%, 12%, 18% or 28% — and the tool shows you the base price, the GST amount split into CGST and SGST, the IGST equivalent for inter-state sales, and the final total in clear rows.
Shopkeepers and traders use it all day for quick quotes. A wholesaler asked "what's my net cost after I subtract 18% GST?" can answer in two taps. A salon owner who lists services at an MRP that already includes GST can reverse-calculate the base price for their own books. Freelancers and consultants negotiating fees use it to convert between gross and net amounts when the client asks for both. It's also useful when checking a supplier's invoice — type the total, slab and inclusive/exclusive mode, and you can confirm the tax in seconds instead of opening a spreadsheet.
The tool is fully India-aware. The CGST/SGST split applies automatically for intra-state transactions, while inter-state transactions show the IGST equivalent. You can switch between standard slabs without clearing the form. Calculations are done entirely in your browser using plain JavaScript — nothing is sent to a server, and no signup is required. It loads in under a second on a 4G connection and works fine on older Android browsers.
Common use cases: a kirana store calculating GST on a basket of mixed-rate items, a manufacturer pricing a product to land at a round MRP after tax, an accountant tying out a vendor invoice against the book entry, an Amazon or Flipkart seller validating the tax amount their platform deducted, a restaurant calculating the GST portion of a takeaway bill, or a contractor estimating the post-tax invoice for a project. Free, instant, no installation. If you have one number and a slab, you can have the answer before the customer finishes asking the question.
"Add GST" for prices before tax. "Remove GST" for inclusive amounts.
Choose 5/12/18/28% or set a custom rate.
See base, GST, final amount, and CGST + SGST split.
Add GST (exclusive) is used when your displayed price does not include tax. You enter the base price, choose the rate, and the tool adds GST on top. Most B2B invoices and wholesale shops use this.
Remove GST (inclusive) is used when your displayed price already includes GST. You enter the final amount and the tool calculates how much of it was the base and how much was tax. This is the standard for retail shops, restaurants, and most consumer-facing prices in India.
Yes. The math is straightforward and matches what your CA or billing software would calculate. Always verify with your accountant for final tax filings.
CGST (Central) and SGST (State) apply when buyer and seller are in the same state — each is half of the total GST. IGST applies when they're in different states — single tax equal to the full GST amount.
If your annual turnover crosses ₹40 lakh (₹20 lakh for services), GST registration is mandatory. Below that, it's optional but recommended for B2B businesses claiming input tax credit.
This tool calculates GST. For full GST-compliant invoices with HSN codes, use billing software like Vyapar or myBillBook. Use our Shop Bill Message tool for quick WhatsApp bills.
Other free tools small Indian businesses use alongside this one.
