How do I calculate GST?

To add GST: GST amount = (Original cost × GST rate) ÷ 100, and net price = original cost + GST amount. To remove GST from an inclusive price: GST amount = Inclusive price − (Inclusive price × 100 ÷ (100 + GST rate)).

What are the GST rates in India?

India has GST slabs of 0%, 5%, 12%, 18% and 28%. Most goods and services fall under 5%, 12% or 18%. Luxury and sin goods attract 28%.

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Q: What is the difference between CGST, SGST and IGST?

For intra-state sales, GST splits equally into CGST (central) and SGST (state). For inter-state sales, the full amount is IGST (integrated GST). For example, 18% GST intra-state = 9% CGST + 9% SGST.

Add or remove GST instantly. Get CGST, SGST and IGST breakdown at any rate — 5%, 12%, 18% or 28%.

Enter your details

Amount (excluding GST) — ₹

GST Rate

5% 12% 18% 28%

Transaction type

Result

Base amount₹10,000

CGST (9%)₹900

SGST (9%)₹900

IGST (18%)₹1,800

Total GST₹1,800

Total amount₹11,800

This is an estimate for guidance only. For GST registration, return filing, or advice, talk to our GST experts.

How to use the GST calculator

Our GST calculator works two ways. Choose Add GST when you have a price before tax and want to know the final amount including GST. Choose Remove GST when you have a GST-inclusive price and want to find the base amount and the tax portion. Enter the amount, pick your GST rate, and select whether the transaction is intra-state or inter-state — the result updates instantly.

GST calculation formula

The formulas behind the calculator are simple:

To add GST: GST amount = (Original cost × GST rate) ÷ 100. Total = Original cost + GST amount.
To remove GST: Base amount = Inclusive price × 100 ÷ (100 + GST rate). GST = Inclusive price − Base amount.
Intra-state: GST splits equally — CGST = SGST = (GST rate ÷ 2).
Inter-state: The full rate applies as IGST.

GST rates in India

India's GST has five main slabs: 0%, 5%, 12%, 18% and 28%. Essential items often fall under 0% or 5%, standard goods and services under 12% or 18%, and luxury or sin goods under 28%. The correct rate for your product depends on its HSN or SAC code. If you're unsure which rate applies, our team can help you classify your goods and services correctly.

Frequently asked questions

Is this GST calculator accurate?

Yes — it uses the official GST formulas. However, the correct GST rate for your specific product or service depends on its HSN/SAC classification. For exact compliance, consult our GST experts.

What is the difference between CGST, SGST and IGST?

For sales within the same state (intra-state), GST is split equally into CGST (goes to central government) and SGST (goes to state government). For sales between states (inter-state), the full amount is charged as IGST.

Do I need GST registration?

GST registration is mandatory if your turnover exceeds ₹40 lakh (goods) or ₹20 lakh (services), or if you sell inter-state or on e-commerce platforms. Learn more about GST registration.

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