GST Calculator for India
A GST calculator works out the Goods and Services Tax on a price. Enter an amount to add GST to it or remove GST from a GST-inclusive price, pick the rate, and see the taxable value, CGST and SGST or IGST, and the total. It uses the rates in force from 22 September 2025 and the earlier rates for older invoice dates.
Last updated 21 October 2026
- Free, no sign-up
- Add or remove GST
- CGST, SGST and IGST split
Calculate GST on Any Amount
Rates in force from 22 September 2025.
Result
Taxable value
₹10,000.00
Total GST
₹1,800.00
Total amount (including GST)
₹11,800.00
| Taxable value | ₹10,000.00 |
|---|---|
| CGST @ 9% | ₹900.00 |
| SGST / UTGST @ 9% | ₹900.00 |
| Total GST @ 18% | ₹1,800.00 |
| Total amount | ₹11,800.00 |
Rounded to the nearest paisa. Compensation cess is not calculated.
The same amount at every current GST rate
Adding GST to ₹10,000.00.
| Rate | Taxable value | GST | Total |
|---|---|---|---|
| 0% | ₹10,000.00 | ₹0.00 | ₹10,000.00 |
| 0.25% | ₹10,000.00 | ₹25.00 | ₹10,025.00 |
| 3% | ₹10,000.00 | ₹300.00 | ₹10,300.00 |
| 5% | ₹10,000.00 | ₹500.00 | ₹10,500.00 |
| 18% | ₹10,000.00 | ₹1,800.00 | ₹11,800.00 |
| 40% | ₹10,000.00 | ₹4,000.00 | ₹14,000.00 |
The 40% rate applies only to select de-merit goods and services. Pan masala, gutkha, cigarettes, chewing tobacco such as zarda, unmanufactured tobacco and bidi stayed on their earlier GST rate plus compensation cess when the new rates started; this tool does not calculate compensation cess. Check your item's HSN or SAC rate in the CBIC GST rate notifications. This tool is for general guidance and is not tax or legal advice.
How do you calculate GST?
To add GST to a price that excludes tax, multiply the price by the GST rate and divide by 100. The taxable value stays the same, and the invoice total is the taxable value plus GST.
To remove GST from a price that already includes it, first find the taxable value by multiplying the price by 100 and dividing by 100 plus the rate. The GST is whatever is left. Do not simply take 18% off a GST-inclusive price: that overstates the tax, because the 18% was charged on the smaller taxable value, not on the total.
Example: a service priced at ₹10,000 before tax at 18% carries ₹1,800 GST, so the invoice total is ₹11,800. Working backwards, ₹11,800 including 18% GST is ₹11,800 × 100 ÷ 118 = ₹10,000 taxable value and ₹1,800 GST. Sold within one state, that ₹1,800 is shown as ₹900 CGST and ₹900 SGST.
GST formulas
- Add GST
- GST = amount × rate ÷ 100
- Total = amount + GST
- Remove GST
- GST = amount − (amount × 100 ÷ (100 + rate))
- Taxable value = amount − GST
- Split
- Intra-state: CGST = SGST = GST ÷ 2
- Inter-state: IGST = GST
What are the GST rates after 22 September 2025?
GST now has two main rates: a merit rate of 5% and a standard rate of 18%, plus a special de-merit rate of 40% for a select few goods and services. The 56th GST Council meeting replaced the earlier four-rate structure, and the new rates took effect on 22 September 2025. The lower rates of 0%, 0.25% and 3% continue for the specific items they cover.
The date on the invoice matters. A supply made before 22 September 2025 was taxed at the earlier rates, which included 12% and 28%, so set the invoice date in the calculator to see the right slabs for an old invoice or a credit note against one.
One exception: pan masala, gutkha, cigarettes, chewing tobacco such as zarda, unmanufactured tobacco and bidi did not move to the new rates on 22 September 2025. They continued at their existing GST rate and compensation cess, according to the same release. This calculator does not add compensation cess.
Rates checked 21 October 2026.
GST rate slabs before and after 22 September 2025
| Rate | Before | From 22 Sep 2025 |
|---|---|---|
| 0% | Yes | Yes |
| 0.25% | Yes | Yes |
| 3% | Yes | Yes |
| 5% | Yes | Yes (merit rate) |
| 12% | Yes | No |
| 18% | Yes | Yes (standard rate) |
| 28% | Yes | No (see tobacco note) |
| 40% | No | Yes (select de-merit goods and services) |
When do you charge CGST and SGST, and when IGST?
It depends on whether the supplier and the place of supply are in the same state. On an intra-state supply, the GST rate is split into two equal halves: Central GST (CGST) and State GST (SGST), or Union Territory GST (UTGST) in a union territory. On an inter-state supply, the whole rate is charged as Integrated GST (IGST). The total tax is the same either way; only the heads change.
For example, a Pune business selling goods at 18% that are delivered to a customer in Mumbai charges 9% CGST and 9% SGST. The same goods delivered to a customer in Bengaluru carry 18% IGST. Choose the supply type in the calculator to see the split.
Intra-state
Pune → Mumbai
₹10,000 taxable value at 18%
Inter-state
Pune → Bengaluru
₹10,000 taxable value at 18%
Which GST rate applies to my product or service?
The rate depends on the HSN code of the goods or the SAC code of the service, not on the type of business. Look up the code in the CBIC GST rate notifications and use the rate in force on the invoice date. Use the 40% rate only if your item is one of the de-merit goods or services actually listed at 40%.
Once you know the rate, the free GST invoice generator turns the same numbers into a printable tax invoice. If you raise invoices every day, compare GST billing software or browse the other free ERP tools.
This tool is for general guidance and is not tax or legal advice.
Frequently asked questions
How do I calculate GST on an amount?
To add GST, multiply the amount by the GST rate and divide by 100: GST on ₹1,000 at 18% is ₹180, so the total is ₹1,180. To remove GST from a GST-inclusive price, use GST = amount − (amount × 100 ÷ (100 + rate)): ₹1,180 including 18% GST is ₹1,000 plus ₹180 GST.
What are the GST rates in India now?
From 22 September 2025, following the 56th GST Council meeting, GST uses a merit rate of 5% and a standard rate of 18%, with a special 40% rate for a select few de-merit goods and services. Rates of 0%, 0.25% and 3% continue for specific items. Some tobacco products stayed on their earlier rate plus compensation cess when the new rates started. Always confirm the rate for your item's HSN or SAC code in the CBIC rate notifications.
What is the difference between CGST, SGST and IGST?
On an intra-state supply, where the supplier and the place of supply are in the same state or union territory, GST is split equally into CGST and SGST (or UTGST in a union territory). At 18%, that is 9% CGST and 9% SGST. On an inter-state supply, the full rate is charged as IGST, for example 18% IGST.
Related Tools
Free GST Invoice Generator
Build a GST tax invoice with CGST, SGST or IGST and amount in words, then print it or save it as a PDF.
Try it free ToolsERP Tools
Free calculators and comparison tools for ERP cost, vendor selection and planning.
Browse tools SoftwareGST billing software
See Perimattic’s page on GST billing software for Indian businesses.
Learn morePut GST calculation inside your billing and ERP
This calculator handles one amount at a time. If your team raises GST invoices every day, talk to Perimattic about building tax calculation and invoicing into the systems you already use.
Or email sales@perimattic.com