What is GST full form?

GST stands for Goods and Services Tax. It is a comprehensive, multi-stage, destination-based indirect tax that replaced multiple older taxes like VAT, Service Tax, Central Excise, and others in India on July 1, 2017.

How to calculate 18% GST on a price?

To add 18% GST to a price: GST Amount = Price × 18/100. Final Price = Price + GST Amount. Example: On ₹1,000 — GST = ₹180, Final Price = ₹1,180. CGST = ₹90, SGST = ₹90.

What is reverse GST calculation?

Reverse GST (also called GST-exclusive calculation) is used when you already know the GST-inclusive price and want to find the original price and the GST component. Formula: Original Price = GST-Inclusive Price ÷ (1 + GST Rate/100). GST Amount = GST-Inclusive Price − Original Price.

What is the difference between CGST and SGST?

GST on intra-state (within same state) transactions is split equally into CGST (Central GST, collected by Central Government) and SGST (State GST, collected by State Government). For example, on 18% GST — CGST = 9% and SGST = 9%. For inter-state transactions, IGST (Integrated GST = full rate) applies instead.

Which products fall under 28% GST slab?

The 28% GST slab covers luxury and sin goods such as: automobiles (cars, bikes), cigarettes and tobacco products, aerated drinks, cement, air conditioners, large-screen televisions, washing machines, and casino/gambling activities.

GST Calculator – Calculate GST Amount Online Free

What is GST?

GST (Goods and Services Tax) is a comprehensive, multi-stage, destination-based indirect tax levied on the supply of goods and services across India. It replaced a complex web of older indirect taxes — including VAT (Value Added Tax), Central Excise Duty, Service Tax, Entry Tax, and Octroi — with a unified single tax structure.

GST was introduced in India on July 1, 2017, under the Constitutional Amendment Act of 2016. It follows the principle of "one nation, one tax," making the Indian taxation system more transparent, efficient, and business-friendly. GST is administered jointly by the Central Government and the State Governments.

Every business with an annual turnover exceeding ₹20 lakh (₹10 lakh for special category states) must register for GST and collect GST from customers on behalf of the government. As a consumer, GST is always included in the final price of most products and services you buy in India.

GST Slabs in India 2026

The GST Council has categorized goods and services into five main tax slabs:

GST Slab	Category	Examples of Goods/Services
0%	Exempt / Zero-Rated	Fresh vegetables, fruits, milk, eggs, bread, rice, wheat, salt, books, newspapers, jute
5%	Low GST	Edible oil, sugar, spices, tea, coffee, coal, life-saving drugs, railway tickets (non-AC), economy class airfare
12%	Standard GST	Butter, ghee, cheese, frozen meat, processed food, cell phones, sewing machines, umbrellas, business class airfare
18%	Standard GST	Most services (restaurants, hotels, IT services), hair oil, toothpaste, soap, capital goods, industrial intermediaries, AC restaurants
28%	Luxury / Sin Goods	Cars, motorcycles, cigarettes, tobacco, aerated drinks, cement, air conditioners, large TVs, washing machines, casinos

*GST rates are subject to revision by the GST Council. Verify current rates from the official GST portal.

How to Calculate GST – Formula

There are two scenarios for GST calculation:

1. Adding GST (GST-Exclusive to GST-Inclusive)

When you know the original price (before GST) and want to find the final price including GST:

GST Amount = Original Price × (GST Rate / 100) Final Price = Original Price + GST Amount CGST Amount = GST Amount / 2 SGST Amount = GST Amount / 2

📌 Example — Adding 18% GST

Given: Original Price = ₹1,000 | GST Rate = 18%

GST Amount = ₹1,000 × 18/100 = ₹180

Final Price = ₹1,000 + ₹180 = ₹1,180

CGST (9%) = ₹90 | SGST (9%) = ₹90

2. Removing GST / Reverse GST (GST-Inclusive to GST-Exclusive)

When you know the GST-inclusive price (the MRP with GST already included) and want to find the original price:

Original Price = GST-Inclusive Price ÷ (1 + GST Rate / 100) GST Amount = GST-Inclusive Price − Original Price CGST Amount = GST Amount / 2 SGST Amount = GST Amount / 2

📌 Example — Removing 18% GST (Reverse Calculation)

Given: GST-Inclusive Price = ₹1,180 | GST Rate = 18%

Original Price = ₹1,180 ÷ (1 + 18/100) = ₹1,180 ÷ 1.18 = ₹1,000

GST Amount = ₹1,180 − ₹1,000 = ₹180

CGST (9%) = ₹90 | SGST (9%) = ₹90

What is CGST and SGST?

Under India's dual GST structure, the tax collected on intra-state transactions (transactions within the same state) is split equally into two components:

CGST (Central Goods and Services Tax) — Collected by the Central Government. It is exactly half of the applicable GST rate. For 18% GST, CGST = 9%.
SGST (State Goods and Services Tax) — Collected by the State Government where the sale takes place. It is also exactly half of the applicable GST rate. For 18% GST, SGST = 9%.

For inter-state transactions (between two different states), IGST (Integrated Goods and Services Tax) applies at the full rate, and it is collected by the Central Government. This calculator shows CGST and SGST for intra-state supplies, which is the most common use case for individuals and businesses.

How to Use This GST Calculator

Select your mode: Choose "Add GST" if you want to find the GST-inclusive price, or "Remove GST (Reverse)" if you have the MRP and want to extract the GST portion.
Enter the amount: Type the price in the amount field or use the slider for quick adjustment.
Select the GST rate: Click one of the slab buttons — 5%, 12%, 18%, or 28%. You can also enter a custom rate in the "Custom GST Rate" field.
View instant results: The calculator instantly shows the GST Amount, Final Price, CGST, and SGST — no need to click Calculate.

Who Needs a GST Calculator?

Business Owners & Entrepreneurs — To quickly compute GST on invoices and verify billing accuracy before sending to clients.
Freelancers & Consultants — To calculate 18% GST on their service fees and prepare correct GST-compliant invoices.
Shopkeepers & Retailers — To determine the GST-exclusive price of products for their books of accounts or to verify supplier invoices.
Consumers & Shoppers — To understand how much GST is embedded in a product's MRP and what the pre-tax price is.
Students & Finance Learners — To practice and understand GST calculations as part of accounting, commerce, or MBA coursework.
CA/Tax Professionals — For quick cross-checking during GST return filing or audit work.

🧾 GST Calculator – Calculate GST Online Free India 2026

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