Add GST or remove it from an inclusive price, and get the CGST, SGST or IGST split ready to drop straight onto an invoice.
Copied to clipboard
The big finance portals bury a three-field calculator under advertising, popups and a signup prompt, and most of them still list only the pre-2025 slabs. This one loads in a fraction of the weight, carries both the current and legacy rates, and gives you the line you actually need to paste into an invoice.
Add GST to a base price, or work backwards from a GST-inclusive total to find the taxable value. Most sites split those across two separate pages, so you lose your numbers switching between them. Here it is one toggle and your amount stays put.
0%, 5%, 18% and 40% from the September 2025 reform, plus 3%, 12% and 28% for older invoices, credit notes and amended returns.
One tap copies the taxable value, the CGST and SGST split and the total as a single clean line.
Every calculation runs in your browser with no network request, so there is no tracking of the figures you type and no account wall between you and the answer. It keeps working if your connection drops mid-invoice.
Add GST if you are quoting from a base price. Remove GST if the figure in front of you already includes tax.
Type the rupee figure. Everything recalculates as you type, with no submit button in the way.
Tap a slab, open the legacy rates for older invoices, or type any custom percentage.
Same state splits the tax into CGST and SGST. Other state shows a single IGST figure.
The 56th GST Council meeting replaced the old five-tier structure with a simpler one from 22 September 2025. The 12% and 28% slabs were largely folded into 5% and 18%, and a 40% band was introduced for luxury and sin goods.
| Slab | Typically applies to | Same-state split |
|---|---|---|
| 0% | Nil-rated essentials: fresh produce, unpacked grain, milk, individual life and health insurance, several life-saving drugs. | Nil |
| 5% | Mass-consumption goods: packaged food, soap, shampoo, toothpaste, hair oil, butter, ghee, paneer, namkeen, footwear and apparel below the price threshold. | 2.5% + 2.5% |
| 18% | The standard rate for most goods and services: professional and freelance services, software, electronics, air conditioners, televisions, small cars and two-wheelers up to 350cc. | 9% + 9% |
| 40% | Luxury and demerit goods: tobacco and pan masala, aerated drinks, large cars, motorcycles above 350cc, casinos and betting. | 20% + 20% |
| 3% | Legacy rate retained for gold, silver and other precious metals. | 1.5% + 1.5% |
| 12% / 28% | Legacy slabs. Still needed when you raise a credit note, revise an invoice or amend a return that relates to a supply made before 22 September 2025. | 6% + 6% / 14% + 14% |
Slab allocation is set item by item against the HSN or SAC code. Treat this table as orientation, and confirm the code for your specific supply before filing.
Multiply the taxable value by the rate, then add it back. On a same-state supply the result is halved into CGST and SGST.
GST = Base × Rate / 100A freelancer billing ₹50,000 at 18% adds ₹9,000 of GST, shown as ₹4,500 CGST and ₹4,500 SGST, for an invoice total of ₹59,000.
This is the reverse calculation. Divide out the rate rather than subtracting a percentage, which is the mistake that costs people money.
Base = Total × 100 / (100 + Rate)An MRP of ₹1,180 at 18% contains ₹1,000 of taxable value and ₹180 of GST. Subtracting 18% of ₹1,180 instead would give ₹967.60, understating the base by over ₹32.
| Inclusive amount | Rate | Taxable value | GST inside |
|---|---|---|---|
| ₹1,050 | 5% | ₹1,000.00 | ₹50.00 |
| ₹1,180 | 18% | ₹1,000.00 | ₹180.00 |
| ₹11,800 | 18% | ₹10,000.00 | ₹1,800.00 |
| ₹25,000 | 18% | ₹21,186.44 | ₹3,813.56 |
| ₹14,000 | 40% | ₹10,000.00 | ₹4,000.00 |
Quote a fee, add 18% GST and know the number the client will actually be invoiced before you send the proposal.
Work backwards from MRP to the taxable value so the sale is recorded correctly in your books.
Check a client invoice in seconds, including older supplies that still sit on the 12% or 28% slab.
See exactly how much tax sits inside a restaurant bill, a hotel folio or an electronics receipt.
Multiply the taxable value by the GST rate and divide by 100 to get the tax, then add it to the base for the invoice total. At 18% on ₹10,000 that is ₹1,800 of GST and ₹11,800 payable. On a supply within the same state, the ₹1,800 is recorded as ₹900 CGST and ₹900 SGST.
Divide the inclusive amount by 1 plus the rate over 100, which is the same as multiplying by 100 and dividing by 100 plus the rate. For ₹1,180 at 18%, the taxable value is ₹1,000 and the GST inside is ₹180. Subtracting 18% from the inclusive figure is a common error and gives a lower, incorrect base.
From 22 September 2025 the main structure is 0%, 5%, 18% and 40%, with 3% retained for precious metals. The 12% and 28% slabs were largely removed, with items moving to 5% or 18% and a small set of luxury and demerit goods moving to 40%. Older slabs still matter for invoices and credit notes relating to supplies made before that date.
Place of supply decides it. If supplier and recipient are in the same state or union territory, the rate splits evenly into CGST for the centre and SGST for the state. If they are in different states, the whole amount is charged as IGST and collected centrally. The total tax is identical either way, only the split on the invoice changes.
Yes. Switch the mode to Remove GST, enter the inclusive figure and the tool returns the taxable value, the GST inside it and the CGST, SGST or IGST split. That is the same calculation people search for as reverse GST, GST inclusive calculation or extracting the base price from MRP.
The rate is tied to the HSN code for goods or the SAC code for services, not to a broad category. Most professional and freelance services sit at 18%, everyday packaged goods at 5%, and luxury or demerit items at 40%. Confirm the code for your specific supply on the official GST portal before invoicing, since two similar-looking products can fall on different slabs.
It does. Open the legacy rates row to reach 3%, 12% and 28%, or type any custom percentage. Those rates are still needed for credit notes, revised invoices and return amendments that relate to supplies made before the September 2025 changes.
No. The calculation runs entirely in your browser in JavaScript, with no network request at any point, no logging and no account required. Close the tab and the figures are gone.
This tool shows two decimal places, which is how tax is normally computed per line item. Under section 170 of the CGST Act the final tax payable is rounded to the nearest rupee, so a paise difference between your books and a filed return is expected and is not an error in the calculation.
Enter an amount, pick a slab and take the invoice-ready figure with you in one tap.
Figures are an estimate for planning and invoicing support. Slab allocation depends on the HSN or SAC code of the specific supply, so confirm the applicable rate with your GST practitioner or the official portal before filing.