Add or remove GST from any amount instantly
Built & maintained by Pappu Venkata Subbi Reddy, founder of Clacify · Updated July 2026 · Formulas verified against official Indian government sources
The GST Calculator adds or removes Goods and Services Tax from any amount at India's current rates — 5% and 18% under the simplified two-slab structure in force since 22 September 2025, plus the 40% rate for luxury and sin goods and the special 3% rate for gold and jewellery. In "add GST" mode, enter the base price and the calculator shows the GST amount and the gross (inclusive) price. In "remove GST" mode, enter a tax-inclusive price and it works backwards to reveal the original base price and the tax component — essential when a vendor quotes an all-inclusive figure but you need the pre-tax value for accounting. It also splits the total into CGST and SGST (for intra-state sales) or shows it as IGST (for inter-state sales), exactly as it must appear on a compliant GST invoice.
To add GST: GST amount = base price × rate ÷ 100, and gross price = base price + GST amount. To remove GST from an inclusive amount: base price = inclusive amount × 100 ÷ (100 + rate), and the GST component is the difference. For intra-state supply the total GST is split equally into CGST and SGST (e.g. 18% becomes 9% + 9%); for inter-state supply the full rate is charged as IGST. The calculator performs these exact arithmetic operations in your browser. It does not file returns or validate GSTINs — it is a quick reference for invoicing and verification.
| GST rate | GST amount | CGST + SGST | Total price |
|---|---|---|---|
| 3% (gold & jewellery) | ₹30 | ₹15 + ₹15 | ₹1,030 |
| 5% (essentials & merit goods) | ₹50 | ₹25 + ₹25 | ₹1,050 |
| 18% (standard rate) | ₹180 | ₹90 + ₹90 | ₹1,180 |
| 40% (luxury & sin goods) | ₹400 | ₹200 + ₹200 | ₹1,400 |
Within a state, GST splits equally into CGST + SGST (each half the rate); for an inter-state sale the same total is charged as a single IGST. To work backwards from a tax-inclusive price, divide by (1 + rate): ₹1,180 at 18% → ₹1,180 ÷ 1.18 = ₹1,000 base.
The 56th GST Council meeting overhauled India's GST structure with effect from 22 September 2025. The old four-slab system (5%, 12%, 18%, 28%) was collapsed into two main rates: 5% for essentials and merit goods, and 18% as the standard rate. Most items previously at 12% moved down to 5%, and most 28% items moved down to 18%. A new 40% rate now applies to luxury and sin goods — pan masala, tobacco, aerated drinks, and high-end cars — while niche rates survive for specific sectors (3% on gold and jewellery, 0.25% on rough gems). If an old invoice or price list still shows 12% or 28%, it predates the reform; verify the current rate for the item on the CBIC portal before billing.
Adding GST is easy: ₹1,000 at 18% becomes ₹1,180. Removing it is where mistakes happen. If a shop quotes ₹1,180 "all inclusive" and you want the base price, you do not subtract 18% of ₹1,180 — you divide by 1.18 to get ₹1,000. Subtracting 18% would wrongly give ₹967.60. The reverse calculation matters whenever you need the pre-tax value for your books or to reclaim input tax credit.
The total GST rate is fixed by the item, but how it is split depends on the supply. For a sale within the same state (intra-state), it divides equally into Central GST and State GST — 18% becomes 9% CGST + 9% SGST. For a sale between states (inter-state), the whole 18% is charged as Integrated GST (IGST), which the central government later shares with the destination state. Your invoice must show the correct split, so getting this right keeps your billing compliant.
If your turnover crosses the GST registration threshold (₹20 lakh for services, ₹40 lakh for goods in most states), you must charge GST and file returns. A freelancer billing a client in another state charges IGST; billing a client in the same state charges CGST + SGST. Use this calculator to add GST to your quotes and to check the tax a vendor has charged you before you claim input credit.
To add GST: Final Price = Base Price × (1 + GST Rate/100). Example: ₹1,000 at 18% GST = ₹1,000 × 1.18 = ₹1,180. To remove GST from an inclusive price: Base Price = Inclusive Price ÷ (1 + GST Rate/100). Example: ₹1,180 ÷ 1.18 = ₹1,000.
Since 22 September 2025 (the GST 2.0 reform), India has two main GST slabs: 5% for essentials and merit goods and 18% as the standard rate for most goods and services. A 40% rate applies to luxury and sin goods (pan masala, tobacco, aerated drinks, high-end cars), 3% to gold and jewellery, and 0% to essentials like food grains and lifesaving drugs. The old 12% and 28% slabs were abolished — most 12% items moved to 5% and most 28% items to 18%.
They were removed in the GST 2.0 reform effective 22 September 2025. The GST Council collapsed the four-slab structure into two main rates — most items taxed at 12% moved down to 5%, and most 28% items moved down to 18%, while a new 40% rate was created for luxury and sin goods. If an invoice or price list still shows 12% or 28%, it predates the reform.