Free GST Calculator India — Calculate GST Online Instantly

Calculate GST Inclusive, Exclusive, CGST, SGST and IGST amounts quickly with our free online GST calculator.

✓ Updated for GST 2.0 rates (5% · 18% · 40%)
✓ Paisa-accurate, no rounding errors
✓ No login · data stays on your device

Calculation Breakdown

Enter an amount to see the taxable value, CGST, SGST, IGST and total — results update as you type.

How to use the GST calculator

Choose the mode. Add GST if your price is before tax; Remove GST if the price already includes GST (like an MRP or a bill total).
Enter the amount. Commas are fine — 1,25,000 works.
Pick the GST rate. 5%, 18% and 40% are the main slabs from 22 September 2025. Use Special & older rates for 3% gold, 0.25% diamonds, or old 12%/28% invoices, or type a custom rate.
Select the supply type. Seller and place of supply in the same State/UT → CGST + SGST/UTGST. Different States, imports or SEZ supplies → IGST.
Optional: open Quantity & Discount for multiple units or a trade discount, and tick round-off for a whole-rupee total.

Results update instantly. Use Copy Result to paste the breakup into WhatsApp or Excel, or Share Link to send the exact calculation to someone.

GST formulas with worked examples

1. Adding GST (exclusive price)

GST = Taxable value × Rate ÷ 100 · Total = Taxable value + GST

Example: a laptop bag priced ₹10,000 + 18% GST, sold within Maharashtra. GST = 10,000 × 18 ÷ 100 = ₹1,800 (CGST ₹900 + SGST ₹900). Total = ₹11,800.

2. Removing GST (inclusive price)

Taxable value = Inclusive amount ÷ (1 + Rate ÷ 100) · GST = Inclusive amount − Taxable value

Example: a bill of ₹5,250 at 5%. Taxable value = 5,250 ÷ 1.05 = ₹5,000; GST = ₹250.

3. Inter-state sale (IGST)

Example: ₹25,000 of services billed from Pune to a client in Bengaluru at 18%. IGST = 25,000 × 18% = ₹4,500; total ₹29,500.

A common mistake is to remove GST by subtracting 18% of the total: 18% of ₹1,180 is ₹212.40, but the GST inside ₹1,180 is only ₹180. Always divide by (1 + rate). All GST formulas →

Other GST Tools

GST rates in India (current structure)

From 22 September 2025, after the 56th GST Council meeting, most goods and services fall in two slabs: a merit rate of 5% and a standard rate of 18%, with a de-merit rate of 40% for a few luxury and sin goods. Special rates continue for gold and jewellery (3%) and precious stones (0.25% / 1.5%). From 1 February 2026 tobacco products moved to 40% (bidi 18%) and the compensation cess ended.

Rate	CGST + SGST	Typical use
0% / Exempt	—	Fresh food, many health & education services
5%	2.5% + 2.5%	Daily essentials, many foods, some services
18%	9% + 9%	Most goods and most services
40%	20% + 20%	Luxury cars, aerated drinks, tobacco, pan masala
3%	1.5% + 1.5%	Gold, silver, jewellery
0.25%	0.125% + 0.125%	Rough diamonds, precious stones

The examples are indicative only. Your exact rate depends on the HSN/SAC code and conditions in the notification — check the CBIC rate notifications before invoicing.

Frequently Asked Questions

How do I calculate 18% GST on an amount?

Multiply the amount by 0.18 for the GST, then add it: ₹2,500 × 0.18 = ₹450, so the total is ₹2,950. For a price that already includes 18%, divide by 1.18 instead.

Is the 12% and 28% GST slab still applicable?

For most goods, no. From 22 September 2025 nearly all 12% items moved to 5% and most 28% items to 18%. 28% remained only for tobacco until 31 January 2026. Use the old rates only to check invoices whose time of supply was before the change.

When do I charge CGST + SGST and when IGST?

It depends on the location of the supplier and the place of supply, not simply the customer’s billing address. If both are in the same State or UT, charge CGST + SGST/UTGST; if different, IGST. Imports, exports and SEZ supplies are inter-state. See the IGST guide.

Why does my answer differ by a paisa from another calculator?

We round each tax head to the nearest paisa (half-up), like an invoice. Some tools round only the total or use floating-point maths, which can drift by ₹0.01.

Is my data stored or sent anywhere?

No. Every calculation happens inside your browser. Recent calculations are saved only in your own browser’s storage and can be cleared anytime.

Can I use this to make a GST invoice?

You can use the numbers, but the PDF from the multi-item tool is a calculation summary, not a tax invoice. A valid invoice needs GSTIN, invoice number and date, HSN/SAC, place of supply and other details under Rule 46.