Free GST Calculator
Work out GST in seconds: add or remove tax and see the exact CGST, SGST & IGST split. No formulas, no spreadsheets.
Result
Base + ₹500.00
GST = ₹10,500.00
Total
Need this on an invoice? The free GST invoice generator works out CGST, SGST or IGST for every line. ProfitBooks does it on every invoice you raise.
Start your free trialHow to calculate GST with this tool
The ProfitBooks GST calculator does the maths in three quick steps. Use it to add GST to a base price or extract GST from a price that already includes it.
Enter the amount
Type the value of your goods or service in rupees.
Choose the GST rate
Pick a GST 2.0 slab (0%, 5%, 18% or 40%) or set a custom rate.
Add or remove GST
Toggle the tax treatment and supply type. The split updates instantly.
GST 2.0 slab rates (current)
India moved to a simplified GST structure, popularly called GST 2.0, effective 22 September 2025, following the 56th GST Council meeting. The earlier 12% and 28% slabs were removed and most goods and services now fall under four rates.
| Rate | Typically applies to |
|---|---|
| 0% | Nil-rated & exempt items — most fresh food, many essential medicines, individual health & life insurance |
| 5% | Daily essentials, packaged food, most medicines, EVs, agricultural goods |
| 18% | Standard rate — electronics, appliances, most services, apparel, small cars |
| 40% | Luxury & sin goods — aerated/caffeinated drinks, premium vehicles, tobacco-related items |
A few special rates sit outside the main slabs (for example, 3% on precious metals like gold, 1.5% on diamonds, and 0.25% on rough precious/semi-precious stones). Tobacco and pan masala stay on 28% + cess transitionally. Use the Custom rate box for these. Always confirm the rate and HSN/SAC code for your specific product before filing.
The four components of GST
Central GST, collected by the central government on intra-state supply, charged alongside SGST (usually each is half the total rate).
State GST, collected by the state government on intra-state supply, charged alongside CGST.
Integrated GST, collected by the centre on inter-state supply and imports, then shared with the destination state.
Union Territory GST, which applies in place of SGST for supplies within a union territory, charged alongside CGST.
Add GST vs Remove GST
Add GST (exclusive): your amount is the base price, so GST is added on top. GST = Amount × Rate, and Total = Amount + GST.
Remove GST (inclusive): your amount already contains GST, so the tool works backwards to the base. Base = Amount ÷ (1 + Rate/100), and GST = Amount − Base.
GST formula with a worked example
The examples use the rate the calculator starts on, 5%, and an amount of ₹10,000. Change the amount or rate above and the result panel shows the same steps for your numbers.
Add GST (price excludes tax)
GST = Amount × Rate ÷ 100
Total = Amount + GST
Remove GST (price includes tax)
Base = Amount ÷ (1 + Rate ÷ 100)
GST = Amount − Base
Split the GST
Intra-state: CGST = SGST = GST ÷ 2
Inter-state: IGST = GST
Common GST calculation mistakes
- Taking the rate of a price that already includes GSTOn ₹10,500 including GST, 5% of the total is ₹525.00, but the GST inside it is ₹500.00. Divide by 1.05 first, or use Remove GST above.
- Choosing CGST + SGST when the supply is inter-stateIntra-state supplies take CGST + SGST and inter-state supplies take IGST, so check where the supply takes place before you pick the supply type. Our guide to place of supply in GST explains how it is decided.
- Picking a slab without checking the HSN or SAC codeThe rate follows the classification of the goods or service. Look up the code first; our guide to HSN codes under GST explains how.
- Rounding at different pointsRounding each line and then adding gives a slightly different total than rounding once at the end. Pick one method and use it on every invoice. This calculator shows results to two decimals (paise).
Frequently asked questions
What is the current GST rate in India?
Under GST 2.0, effective 22 September 2025, the main slabs are 0%, 5%, 18% and 40%. The earlier 12% and 28% slabs were removed. A few special rates (3%, 1.5%, 0.25%) still apply to items like precious metals and stones.
How do I calculate GST on an amount?
To add GST to a base price, multiply the amount by the GST rate: GST = Amount × Rate ÷ 100, then Total = Amount + GST. For example, ₹10,000 at 18% gives ₹1,800 GST and ₹11,800 total.
How do I remove GST from a price that already includes it?
Divide the inclusive amount by (1 + rate/100) to get the base, then subtract to find the GST. For ₹11,800 at 18%: base = 11,800 ÷ 1.18 = ₹10,000, so GST = ₹1,800.
What is the difference between CGST, SGST and IGST?
For sales within the same state (intra-state), GST is split equally into CGST and SGST. For sales across states (inter-state) and imports, the whole amount is charged as IGST instead.
Is this GST calculator free to use?
Yes. The ProfitBooks GST calculator is completely free, with no sign-up required. It works on mobile and desktop and updates instantly as you type.
Can I enter a GST rate that is not one of the slabs?
Yes. Type any rate in the Custom rate box. The base amount, the GST and the CGST and SGST or IGST split update as you type.
Why is my GST higher when I take the rate of the total?
Because the rate applies to the base amount, not to a price that already includes GST. If your amount includes GST, choose Remove GST so the calculator divides by one plus the rate instead.
How do I put this GST on an invoice?
Use the free ProfitBooks GST invoice generator. Add each item with its HSN or SAC code and GST rate, choose intra-state or inter-state, and it works out the tax for every line. You can then download a PDF or print it.
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ProfitBooks auto-applies CGST, SGST & IGST, keeps your HSN/SAC codes in order, and turns it all into GSTR-1 & GSTR-3B ready reports. It is built for Indian small businesses.
This calculator is for general guidance only and reflects GST 2.0 rates effective 22 Sep 2025. It is not tax advice. Confirm rates for your goods/services before filing.