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Free GST Calculator India (2026) — Inclusive & Exclusive

Calculate GST instantly with India's simplest GST calculator. Supports 5%, 12%, 18% and 28% slabs.

GST Calculator

Net Amount₹0
Total GST (18%)₹0
CGST (9.0%)₹0
SGST (9.0%)₹0
Total Amount₹0
✨ AI Explainer

What this GST means for your business

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About this tool

How to use this GST calculator

Enter any amount, choose whether the value is GST-inclusive or exclusive, pick the GST slab and you get the breakdown instantly. Works for all standard Indian GST rates: 5%, 12%, 18% and 28%.

Why GST math matters

If you are a freelancer, small business or shop owner you will run this calculation dozens of times a week. Wrong GST on an invoice can mean penalties or overpaid tax — both eat into your margin. Use this every time before sending an invoice.

How to use the GST Calculator

Takes about a minute. No signup, no download, your data stays in your browser.

  1. 1
    Open the tool. Scroll up to the GST Calculator above — it loads instantly in your browser, no install needed.
  2. 2
    Enter your values. The fields come pre-filled with realistic defaults so you can see how it works — replace them with your own numbers.
  3. 3
    Read the result. The output updates instantly. Copy or share it — nothing is uploaded to a server, everything stays on your device.

Frequently asked questions

Common questions about the GST Calculator.

What is the difference between GST-inclusive and GST-exclusive amounts?

GST-exclusive is the base price before tax, and GST-inclusive is the total after GST is added. This tool computes either direction, so you can add GST to a base price or back it out of a total.

How do I remove GST from a total price?

Enter the GST-inclusive amount and the rate, and the calculator works backward to show the base price and the GST portion separately — useful for invoicing and accounting.

Which GST rates does it support?

It is built for India's GST, where common slabs are 5%, 12%, 18% and 28%; enter whichever rate applies to your goods or services.

What are CGST and SGST?

For intra-state sales the total GST is split equally into CGST (central) and SGST (state) — for example 18% becomes 9% plus 9% — while inter-state sales use a single IGST. The total tax amount is the same either way.

Why doesn't adding then removing GST always give the exact original number?

Rounding at each step can cause a difference of a paisa or so. For precise invoices, follow your accounting software's rounding rules.

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