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GST Calculator

Calculate GST amount with CGST, SGST and IGST breakdown

GST Details

Enter amount and click Calculate GST

Base Amount —
CGST (intra-state) —
SGST (intra-state) —
IGST (inter-state) —
Total Amount —

How to Use

  1. Enter Amount — type the base amount (exclusive) or total amount (inclusive of GST).
  2. Select GST Rate — choose 5%, 12%, 18%, or 28%.
  3. Select Mode — "Add GST" to calculate tax on a base price; "Remove GST" to extract tax from a GST-inclusive price.
  4. View Breakdown — see CGST, SGST (for intra-state), and IGST (for inter-state) amounts separately.

What is the GST Calculator?

The GST Calculator is a free online tool that computes the Goods and Services Tax on any amount. It supports both adding GST to a base price (exclusive) and removing GST from a total (inclusive), and breaks the tax into CGST + SGST (intra-state) or IGST (inter-state) components as applicable under Indian GST law.

Understanding GST in India

GST (Goods and Services Tax) was introduced in India on 1 July 2017, replacing a complex web of central and state indirect taxes. It is a destination-based consumption tax levied at four main rates:

  • 5% — essential goods and services (medicines, railway tickets, small restaurants)
  • 12% — processed foods, computers, business class air travel
  • 18% — most services, electronics, capital goods (the most common rate)
  • 28% — luxury goods, automobiles, tobacco, cement

Some items attract 0% (exempt): fresh produce, milk, eggs, educational services, healthcare.

CGST, SGST, and IGST — What is the Difference?

GST is a dual structure where both the Centre and states collect tax:

  • CGST (Central GST) + SGST (State GST): Applies to intra-state transactions. Each is half the total GST rate. E.g., on an 18% transaction: CGST = 9%, SGST = 9%.
  • IGST (Integrated GST): Applies to inter-state transactions and imports. Equal to the full GST rate (e.g., 18%). Collected by the Centre and distributed to the destination state.

How to Calculate GST

Adding GST (exclusive price): GST Amount = Base Price × GST Rate / 100. Total = Base Price + GST Amount.

Removing GST (inclusive price): GST Amount = Total Price × GST Rate / (100 + GST Rate). Base Price = Total Price – GST Amount.

Example: A service priced at ₹1,000 + 18% GST = ₹1,180 total (CGST ₹90 + SGST ₹90).

Frequently Asked Questions

GST has five rate slabs: 0% (essential goods and services like fresh food, healthcare, education), 5% (packaged food, medicines), 12% (processed food, mobile phones), 18% (most services, electronics, restaurants), and 28% (luxury goods, tobacco, aerated drinks). Some items like petroleum and alcohol are outside GST.

For transactions within the same state: CGST (Central GST) + SGST (State GST) apply, each at half the total GST rate. For transactions between states: IGST (Integrated GST) applies at the full rate. The split goes to the Central and State governments respectively.

Small businesses with annual turnover below ₹1.5 crore (₹75 lakh for some states) can opt for the Composition Scheme — pay 1–5% of turnover as flat tax instead of the standard GST. Simplifies compliance but disallows input tax credit and interstate sales.

GST registration is compulsory when: annual aggregate turnover exceeds ₹20 lakh (₹10 lakh for NE states and special category states); you supply goods/services across state borders; you sell via e-commerce platforms; or you are required to pay tax under reverse charge mechanism.

ITC allows businesses to deduct the GST they paid on purchases (inputs) from the GST they collect on sales (outputs). Only the net difference is paid to the government. This eliminates the cascading tax-on-tax effect that existed under the old VAT system.

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