About the GST Calculator
Work out GST in seconds: add GST to a net price or extract it from an inclusive price, at any rate, and see the CGST and SGST split for sales within a state or IGST for sales between states.
Key features
- Add GST to a net price
- Remove GST from an inclusive price
- One-click rates: 0.25%, 3%, 5%, 12%, 18%, 28%, 40%
- CGST + SGST split for sales within a state
- IGST for sales between states
- Any custom rate
Calculate GST in seconds
Whether you're writing an invoice, checking a bill or pricing a product, this calculator adds GST to a price or takes it out of a GST-inclusive total, and shows the CGST/SGST or IGST breakdown you need on a tax invoice.
GST formulas
Adding GST: GST = Amount × Rate ÷ 100 Total = Amount + GST
Removing GST: Net = Total ÷ (1 + Rate ÷ 100) GST = Total − Net
Example: 18% GST
| Add GST to 1,000 | Remove GST from 1,180 | |
|---|---|---|
| Net amount | 1,000.00 | 1,000.00 |
| GST at 18% | 180.00 | 180.00 |
| Total | 1,180.00 | 1,180.00 |
| CGST 9% + SGST 9% | 90 + 90 | 90 + 90 |
| or IGST 18% | 180 | 180 |
Intra-state vs inter-state supply
| Supply | Taxes charged | Example at 18% |
|---|---|---|
| Seller and buyer in the same state | CGST + SGST (half each) | 9% + 9% |
| Seller and buyer in different states | IGST | 18% |
| Union territory without a legislature | CGST + UTGST | 9% + 9% |
Related tools
VAT calculator, profit margin calculator, or discount calculator.
For tax filing and invoices, confirm the applicable rate and HSN/SAC code with the GST portal or a tax professional.
How to use the GST Calculator
- Enter your numbers in the fields above. Units and options can be changed at any time.
- The result updates instantly as you type; there's no calculate button to press.
- Check the breakdown under the main result for the details behind the number.
- Adjust the inputs to compare scenarios, for example a different rate or term.