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GST Calculator India

Free GST calculator for India 2026. Add or remove GST instantly with all slabs — 5%, 12%, 18%, 28%. Shows CGST, SGST and IGST split.

What is GST Calculator India?

A GST calculator helps businesses and consumers compute Goods and Services Tax on any transaction in India. It can add GST to a base (ex-GST) price to find the total payable, or strip GST out of an inclusive price to find the original base amount. It also splits the total GST into equal CGST and SGST components for intra-state transactions.

How to use

  1. 1 Choose the mode: 'Add GST' to calculate GST on top of a base price, or 'Remove GST' to find the base price from a GST-inclusive amount.
  2. 2 Enter the amount in the input field.
  3. 3 Select a GST slab — 5%, 12%, 18%, or 28% — or type a custom rate.
  4. 4 The result shows the final amount, base amount, and the CGST and SGST split instantly.
  5. 5 For interstate transactions, the total GST amount equals IGST (no CGST/SGST split applies).

Formula

Add GST: Total = Amount × (1 + GST% / 100). Remove GST: Base = Inclusive Amount / (1 + GST% / 100). CGST = SGST = Total GST / 2

Example calculation

A product priced at ₹1,000 with 18% GST has a total price of ₹1,180. The GST component is ₹180, split equally as ₹90 CGST and ₹90 SGST. Conversely, if you see a price tag of ₹1,180 inclusive of 18% GST, the base price is ₹1,000.

Frequently asked questions

What are the main GST slabs in India?

India uses four primary GST slabs: 5% (essential goods and services), 12% (standard goods), 18% (most services and manufactured goods), and 28% (luxury and demerit goods). Some items like fresh food are exempt (0%).

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

For intra-state sales, GST is split equally into CGST (Central GST) and SGST (State GST). For inter-state sales, the entire GST amount is collected as IGST (Integrated GST) by the central government.

Who needs to register for GST?

Businesses with annual turnover exceeding ₹40 lakh (₹20 lakh for service providers and special category states) must register for GST. Voluntary registration is also available for smaller businesses.

Can I claim GST input tax credit?

Yes, registered businesses can claim Input Tax Credit (ITC) for GST paid on purchases used for business, offsetting it against GST collected on sales. This prevents tax cascading.

Is GST charged on exports?

Exports are zero-rated under GST, meaning no GST is charged on exported goods or services. Exporters can claim a refund of GST paid on inputs used in production of exported goods.