GST Calculator
Add or strip GST, and see the CGST and SGST split.
Year-by-year breakdown
Free online GST calculator for India
This free GST calculator works both ways. Enter a pre-tax amount and it adds GST to give the invoice total; enter a GST-inclusive price and it removes GST (a reverse GST calculation) to give the net value and the tax inside it. Pick the rate, 0.25%, 3%, 5%, 12%, 18% or 28%, and it splits the tax into CGST and SGST (half each for a sale within a state) or shows the equivalent IGST for an inter-state sale. No sign-up, instant.
Worked example
Add 18% GST to Rs 10,000 and the invoice total is Rs 11,800: Rs 1,800 of GST, made up of Rs 900 CGST and Rs 900 SGST (or Rs 1,800 IGST across states). Going the other way, a GST-inclusive price of Rs 11,800 at 18% contains Rs 1,800 of GST, so the net value is Rs 10,000.
| Net amount | GST rate | GST | Total |
|---|---|---|---|
| Rs 1,000 | 5% | Rs 50 | Rs 1,050 |
| Rs 10,000 | 18% | Rs 1,800 | Rs 11,800 |
| Rs 50,000 | 28% | Rs 14,000 | Rs 64,000 |
Why use Hisaab's GST calculator
It handles both adding and removing GST, shows the CGST/SGST/IGST split that an invoice needs, and is free with no sign-up. Running a business or freelancing? Estimate your tax on the profits with the income tax calculator.
For AI agents: URL-addressable as /gst/?amount=10000&rate=18&mode=exclusive&country=IN (mode = exclusive to add, inclusive to remove). Docs at llms.txt.
How to use the GST Calculator
- Enter the amount: a pre-tax value to add GST, or a GST-inclusive price to remove GST.
- Pick the GST rate (0.25, 3, 5, 12, 18 or 28%).
- Choose Add GST or Remove GST.
- Read the net amount, GST, CGST, SGST and invoice total in the result cards.
- Open the breakdown to see the IGST equivalent for inter-state supply.
Frequently asked questions
How do I calculate GST on an amount?
To add GST, multiply the amount by the rate: Rs 10,000 at 18% is Rs 1,800 of GST and Rs 11,800 total. To remove GST from an inclusive price, divide by (1 + rate): Rs 11,800 / 1.18 = Rs 10,000 net, so Rs 1,800 is GST.
What is the difference between CGST, SGST and IGST?
For a sale within a state the GST is split equally into CGST (central) and SGST (state). For a sale between states the same total is charged as a single IGST instead. This calculator shows both the CGST/SGST halves and the IGST.
How do I remove GST from a total (reverse GST)?
Divide the GST-inclusive amount by 1 plus the rate as a decimal. At 18%, divide by 1.18 to get the net amount; the difference is the GST. Switch this calculator to Remove GST to do it automatically.
What are the GST rate slabs in India?
The main GST rates are 5%, 12%, 18% and 28%, with special rates of 0.25% (rough diamonds) and 3% (gold and jewellery). Most goods and services fall under 5, 12 or 18%.
Is this GST calculator free?
Yes. It is completely free with no sign-up or ads. It works for any GST rate and for both adding and removing GST.