GST Calculator

About the GST Calculator

Add GST to a price, or work out how much GST is inside a GST-inclusive amount, at the current rates — 0%, 0.25%, 1.5%, 3%, 5%, 18% and 40% — or at a custom rate such as the 12% that still applies to bricks. For a sale within a State, the tax is split into equal CGST and SGST/UTGST; for a sale between States it is IGST at the full rate.

For bills with several items, enter each item’s quantity, price and rate: the calculator totals every line, summarises the tax by rate the way a GST invoice does, and lets you copy the summary or download it as CSV. Everything is calculated in your browser.

Common uses

• Quoting a price with GST added, or finding the price before GST from a bill.
• Checking the CGST, SGST/UTGST or IGST on an invoice.
• Totalling a quick bill with items at different rates, with a tax summary by rate.
• Comparing prices quoted with and without GST.

Current GST rates

At its 56th meeting, the GST Council replaced the four-slab structure with two main rates — 5% and 18% — and a special 40% rate for a few goods and services (GST Council). Special rates continue for precious goods: 3% for gold, silver, platinum, jewellery (including imitation jewellery), pearls and coins, 1.5% for cut and polished diamonds, natural or lab-grown, and 0.25% for rough diamonds and for precious or semi-precious stones other than diamonds (Notification 9/2025-Central Tax (Rate), 9/2025-Integrated Tax (Rate)).

The last 28% slab was removed — pan masala and tobacco products moved to 40% and bidis to 18% (Notification 19/2025-Central Tax (Rate)) — and compensation cess no longer applies to any goods (Notification 03/2025-Compensation Cess (Rate)).

The 12% slab is not part of the new main schedules, but some goods keep that rate: building bricks, fly ash bricks, blocks and aggregates, bricks of fossil meals and earthen or roofing tiles are taxed at 6% CGST + 6% SGST (12% in total) under Notification 14/2025-Central Tax (Rate). Use a custom rate of 12 for them.

CGST, SGST/UTGST and IGST

GST on a supply within one State is shared: the Centre levies CGST and the State levies SGST — or UTGST in a Union Territory without its own legislature — each at half the rate, so 18% becomes 9% + 9%. On a supply from one State to another, the Centre levies IGST at the full rate (CBIC). Whether a sale is intra-State or inter-State depends on where the supplier is and on the place of supply.

How the calculation works

• Adding GST: GST = amount × rate ÷ 100; total = amount + GST.
• Removing GST: GST = amount × rate ÷ (100 + rate); amount before GST = amount − GST. At 18% that is amount × 18 ÷ 118.
• CGST and SGST/UTGST are each worked out at half the rate and rounded to the paisa separately, so they are always equal. When you remove GST, that can make the total GST one paisa more or less than amount × rate ÷ (100 + rate): ₹100 at 18% gives 2 × ₹7.63 = ₹15.26.
• Invoices: tax is calculated on each line and then added up by rate. You can round the invoice total to the nearest rupee; the difference is shown as a round-off line.

Finding the right rate: HSN and SAC

The rate depends on what you supply. Goods are classified by HSN code and services by SAC, and the rate notifications list the rate for each entry; exemptions and conditions can also apply. Check the classification and the current rate notification — or ask a tax professional — before you issue an invoice. This calculator does not choose the rate for you.

Limitations

• You choose the rate — the calculator does not look up rates from HSN or SAC codes.
• Reverse charge, the composition scheme, TDS/TCS under GST and levies outside GST are not handled.
• Amounts are rounded to the paisa on each line; billing software may round a paisa differently.
• For invoices dated before 22 September 2025 (or tobacco before 1 February 2026), the old rates applied — enter them as a custom rate.

Privacy

Everything happens in your browser. What you enter or open here is not uploaded or stored by MySmartCoPilot.