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GST Calculator India (2026) — IGST, CGST & SGST Free

Calculate GST on products and services. Supports IGST, CGST & SGST breakdown, all standard GST rate slabs, and multi-item invoices with instant totals.

ByEditorial Team, Personal Finance Updated Jun 7, 20262026 verified Methodology

GST Calculator

Calculation Mode:
Inter-state: IGST will apply

Items

₹

GST Calculation Results

Total Taxable Value

₹1,000

IGST

₹180

Grand Total (Inclusive)

₹1,180

Total GST Amount₹180

About this calculator

How to Use the GST Calculator

The Goods and Services Tax (GST) is an indirect, comprehensive, multi-stage, destination-based tax levied on every value addition in India. Whether you are a business owner generating invoices or a consumer verifying a bill, understanding how to calculate GST is essential.

Our GST Calculator simplifies this process, allowing you to quickly find the base price, the total GST amount, and the final price, whether the GST is already included or needs to be added.

Adding GST (Exclusive to Inclusive)

If you have the base price of an item and need to know the final price after applying GST:

Formula:

  • GST Amount = (Original Cost × GST Rate) / 100
  • Net Price = Original Cost + GST Amount

Example: You are selling a laptop for ₹40,000 (base price). The GST rate is 18%.

  • GST Amount = (40,000 × 18) / 100 = ₹7,200
  • Net Price = 40,000 + 7,200 = ₹47,200

Removing GST (Inclusive to Exclusive)

If you have the final price (MRP) which already includes GST, and you need to find the base price before tax:

Formula:

  • GST Amount = Original Cost - [Original Cost × (100 / (100 + GST Rate))]
  • Net Price = Original Cost - GST Amount

Example: You bought a smartphone for ₹23,600, and this price includes 18% GST. You want to know the base price.

  • Base Price = 23,600 × [100 / (100 + 18)] = 23,600 × (100 / 118) = ₹20,000
  • GST Amount = 23,600 - 20,000 = ₹3,600

Understanding CGST, SGST, and IGST

GST in India is divided into three main components depending on whether the transaction happens within a single state (Intra-state) or between different states (Inter-state).

1. Intra-State Transactions (Within the same state)

When the supplier and the buyer are located in the same state (e.g., a seller in Mumbai selling to a buyer in Pune), the total GST is split equally into two parts:

  • CGST (Central Goods and Services Tax): Collected by the Central Government.
  • SGST (State Goods and Services Tax): Collected by the State Government.

If the total GST is 18%, it will be billed as 9% CGST and 9% SGST.

2. Inter-State Transactions (Between different states)

When the supplier and the buyer are located in different states (e.g., a seller in Delhi selling to a buyer in Bangalore), a single integrated tax is levied:

  • IGST (Integrated Goods and Services Tax): Collected entirely by the Central Government (who then distributes the state's share to the destination state).

If the total GST is 18%, it will be billed as a flat 18% IGST.

Common GST Slab Rates in India

India currently operates on a multi-tiered GST structure:

  • 0% (Exempt): Essential items like fresh fruits, vegetables, milk, bread, and printed books.
  • 5%: Mass consumption items like sugar, spices, tea, coffee, edible oil, and life-saving drugs.
  • 12%: Items like mobile phones, processed food, butter, cheese, and computers.
  • 18%: Most services, capital goods, hair oil, toothpaste, soaps, and industrial intermediaries. This is the most common rate.
  • 28%: Luxury items, automobiles, aerated drinks, tobacco products, and air conditioners. (Some items also attract an additional Compensation Cess).

Formula

GST Calculation Formula

GST (Goods and Services Tax) calculation:

GST Amount = Net Price × GST Rate / 100
Total Price = Net Price + GST Amount

Or simplified:
Total Price = Net Price × (1 + GST Rate / 100)

Where:

  • Net Price = Price before tax
  • GST Rate = Applicable GST percentage (5%, 12%, 18%, or 28%)
  • GST Amount = Tax amount

Reverse GST Calculation

If you know total price and need to find GST amount:

GST Amount = (Total Price × GST Rate) / (100 + GST Rate)
Net Price = Total Price - GST Amount

GST Rate Categories

  • 0%: Essential items (unprocessed food, medicines)
  • 5%: Essential goods (packaged food, books, footwear)
  • 12%: Intermediate goods (processed food, electronics components)
  • 18%: Standard rate (most goods and services)
  • 28%: Luxury items (cars, alcohol, high-end electronics)

Comparison & Examples

GST Rate by Product Category

Category GST Rate Examples
Essential Items 0% Unprocessed food, medicines, books
Food Items 5% Packaged food, dairy, bakery items
Intermediate Goods 12% Electronics, textiles, chemicals
General Goods 18% Most goods and services
Luxury Items 28% Alcohol, automobiles, high-end electronics

GST Impact on Final Price

Net Price GST Rate GST Amount Final Price Price Increase
₹1,000 5% ₹50 ₹1,050 5%
₹1,000 12% ₹120 ₹1,120 12%
₹1,000 18% ₹180 ₹1,180 18%
₹1,000 28% ₹280 ₹1,280 28%
₹10,000 18% ₹1,800 ₹11,800 18%

Frequently Asked Questions

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

CGST (Central GST) and SGST (State GST) are charged on intra-state transactions (sales within the same state). The tax amount is split equally between the Central and State governments. IGST (Integrated GST) is charged on inter-state transactions (sales between different states) and goes entirely to the Central Government.

How do I calculate the base price from an MRP that includes GST?

To find the base price (exclusive of GST), use the formula: Base Price = MRP × [100 / (100 + GST Rate)]. For example, if a product costs ₹1180 including 18% GST, the base price is 1180 × (100 / 118) = ₹1000.

What are the current GST slab rates in India?

The primary GST slab rates in India are 5%, 12%, 18%, and 28%. Some essential goods are exempt (0%), while certain luxury or "sin" goods (like tobacco and high-end cars) in the 28% bracket also attract an additional compensation cess.

Is GST applicable on freelancer income?

Yes, freelancers must register for and charge GST if their aggregate annual turnover for services exceeds ₹20 Lakhs (or ₹10 Lakhs in Special Category States). For inter-state supply of services, registration is also required if the threshold is crossed. Export of services is considered zero-rated but requires a Letter of Undertaking (LUT).

What is the GST Composition Scheme?

It is a simplified tax scheme for small businesses with an annual turnover of up to ₹1.5 Crores (₹75 Lakhs for special category states). Under this scheme, businesses pay a fixed, lower GST rate (1% to 6%) on their turnover but cannot claim Input Tax Credit (ITC) or charge GST to their customers.

What is Input Tax Credit (ITC)?

Input Tax Credit (ITC) allows businesses to reduce the tax they have already paid on inputs (purchases) from the tax they need to pay on outputs (sales). This mechanism prevents the cascading effect of taxes ("tax on tax").

Related Calculators

Income Tax Calculator • TDS Calculator • Tax Slab Calculator

Disclaimer

This calculator is provided for informational purposes only. It is not financial, investment, tax, or professional advice. Results are estimates based on the assumptions and inputs you provide. Always consult with a qualified financial advisor or tax professional before making any financial decisions. Past performance is not a guarantee of future results.

Sources & References

The figures, formulas, and guidance behind this GST Calculator India draw on authoritative primary sources. For verification and further reading:

Frequently Asked Questions

What are the main GST slabs in India?

GST in India is levied at multiple rates. Most goods and services fall under the 5%, 12%, 18%, or 28% slabs. Essential commodities like basic food items may be exempt or taxed at 0%, while luxury and demerit goods attract 28% plus an additional cess. The calculator applies the slab you select so you always get an accurate result.

How do I calculate GST on a price that already includes GST?

To find the GST amount in a GST-inclusive price, use the formula: GST Amount = Original Price × GST Rate / (100 + GST Rate). For example, if a product is listed at a price that includes 18% GST, divide by 1.18 to get the base price, then subtract to find the tax component. This calculator handles both "add GST" and "remove GST" scenarios automatically.

What is the difference between CGST, SGST, and IGST?
  • CGST (Central GST) and SGST (State GST) are each levied at half the applicable GST rate and apply to transactions within the same state.
  • IGST (Integrated GST) is levied at the full rate on inter-state transactions and imports. The calculator shows the total GST; for intra-state transactions you can split the total equally between CGST and SGST.
Is GST applicable on all goods and services in India?

No. Several goods and services are exempt from GST, including most unprocessed food items, education services, healthcare services, and certain agricultural products. Additionally, businesses with turnover below the GST registration threshold are not required to charge GST. Check the official GST portal for the current exemption list.

Can I use this calculator for both buying and selling scenarios?

Yes. If you are a seller, enter the base price and the applicable GST rate to find the total selling price and tax amount. If you are a buyer, enter the GST-inclusive price to reverse-calculate the base price and the tax component. This makes the tool useful for invoicing, purchasing decisions, and reconciliation.

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