How do I calculate GST on an amount?

To add GST: GST Amount = Amount × Rate ÷ 100, Total = Amount + GST. To remove GST from an inclusive amount: Original = Total × 100 ÷ (100 + Rate), GST = Total − Original.

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

For intra-state transactions (buyer and seller in same state), GST is split equally into CGST (Central GST) and SGST (State GST). For inter-state transactions, IGST (Integrated GST) is charged at the full rate and later distributed between centre and destination state.

What are the GST rate slabs in India?

India has five GST slabs: 0% (essentials like fresh food, health, education), 5% (packaged foods, medicines), 12% (processed foods, mobile phones), 18% (most services and electronics — the most common rate), and 28% (luxury goods, automobiles, tobacco).

How to find the original price after removing GST?

Original Price = GST-inclusive price × 100 ÷ (100 + GST Rate). For example, if an item costs ₹1,180 including 18% GST, the original price = 1180 × 100 ÷ 118 = ₹1,000.

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GST Calculator India

Free to Use

Calculate GST in India instantly. Add or remove GST from any amount at 5%, 12%, 18%, 28% rates. CGST, SGST, and IGST breakdown.

Country

GST Scheme

Calculation Mode

GST Details

Amount (₹)

GST Rate

Calculation Type

Exclusive: amount is pre-GST. GST will be added on top.

Transaction Type

Intra-state: buyer and seller in same state. Inter-state: different states.

GST Breakdown

Original Amount (pre-GST)

₹10,000

GST Amount (18%)

₹1,800

CGST (9%)

₹900

SGST (9%)

₹900

Total Amount (incl. GST)

₹11,800

Amount Breakdown

Base Amount (Pre-GST)₹10,000 (84.7%)

CGST (9%)₹900 (7.6%)

SGST (9%)₹900 (7.6%)

Rate Comparison — ₹10,000

GST Rate	Pre-GST	GST Amount	Total
0%	₹10,000	₹0	₹10,000
5%	₹10,000	₹500	₹10,500
12%	₹10,000	₹1,200	₹11,200
18%← current	₹10,000	₹1,800	₹11,800
28%	₹10,000	₹2,800	₹12,800

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Reverse Charge Mechanism (RCM)

Under RCM, the recipient (buyer) pays GST directly to the government instead of the supplier. This is the reverse of the normal GST flow where the supplier collects and remits GST.

When RCM applies: (1) Purchases from unregistered suppliers above threshold; (2) Specified services like legal services from advocates, GTA freight, import of services; (3) Notified goods such as cashew nuts, silk yarn, tobacco leaves. Under RCM, you can claim ITC on the GST you self-remit, subject to normal ITC rules.

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GST Slab Summary

0% — Essential items: fresh food, health services, education
5% — Packaged foods, transport, medicines
12% — Processed foods, mobile phones, business class travel
18% — Most services, electronics, computers, software (most common)
28% — Luxury goods, automobiles, tobacco, aerated drinks

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