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GST Calculator

Add GST on top of a price or remove GST from a GST-inclusive total. See the net amount, GST amount, and the CGST/SGST or IGST split for any slab — 5%, 12%, 18%, or 28%.

GST rate
Type of supply

Base Amount

₹1,000.00

Total GST (18%)

₹180.00

Total Amount

₹1,180.00

Tax Breakdown

Base amount₹1,000.00
CGST (9%)+ ₹90.00
SGST (9%)+ ₹90.00
Total payable₹1,180.00

Goods and Services Tax in India: Inclusive vs. Exclusive Pricing Explained

The Goods and Services Tax (GST) is India's unified indirect tax on the supply of goods and services, replacing a tangle of earlier central and state levies. It is a destination-based, multi-stage tax collected at each step of the supply chain, with credit for the tax paid at previous stages. For everyday calculations, the two questions that matter most are whether a price already includes GST and how the tax is split between the central and state governments.

A GST-exclusive price is the base value before tax — common on B2B quotes and invoices, where GST is added as a separate line. A GST-inclusive price is what a consumer sees on a shelf or a restaurant bill, where the tax is baked into the displayed figure. Removing GST from an inclusive amount requires dividing by one plus the rate, not simply subtracting the percentage, which is a frequent source of error.

CGST, SGST, and IGST

When a supply happens within a single state, the GST rate is divided equally between Central GST and State GST — an 18% rate becomes 9% CGST plus 9% SGST. When the supply crosses state lines, a single Integrated GST (IGST) at the full rate applies instead, which the centre later apportions to the destination state.

The Rate Slabs

Most goods and services fall into the 5%, 12%, 18%, or 28% slabs, with 18% being the most common. A special 3% rate covers items such as gold, and many essential items are zero-rated. The correct slab is tied to the product's HSN code or the service's SAC code as notified by the GST Council.

Disclaimer: This GST calculator is provided for educational and estimation purposes only and does not constitute tax, accounting, or legal advice. GST rates, slabs, and rules are subject to change by the GST Council and may vary by product, service, and place of supply. Always confirm the applicable HSN/SAC rate and consult a qualified tax professional or official GST resources before filing returns or issuing invoices.

How to Use

1

Enter the amount you want to work with.

2

Choose "Add GST" if the amount is before tax, or "Remove GST" if GST is already included.

3

Pick the GST rate slab (or type a custom rate).

4

Select intra-state (CGST + SGST) or inter-state (IGST) to see the tax split.

Features

Add GST (exclusive) and reverse/remove GST (inclusive) modes
All standard slabs — 3%, 5%, 12%, 18%, 28% — plus custom rates
CGST + SGST split for intra-state supply
IGST for inter-state supply
100% client-side — figures never leave your browser

FAQ

Calculate GST instantly with this free India GST calculator. Switch between adding GST to a net price and removing GST from a tax-inclusive total, choose any slab from 5% to 28% or enter a custom rate, and see a clear breakdown of the base amount, GST amount, and gross total. The calculator also splits the tax into CGST and SGST for intra-state sales or shows IGST for inter-state sales. Everything is computed locally in your browser, so your figures stay private.

About GST Calculator

Calculate GST for India in seconds. Add GST on top of a net price or reverse-calculate the GST hidden inside a tax-inclusive total. Choose any slab — 3%, 5%, 12%, 18%, or 28% — or enter a custom rate, and see the base amount, GST amount, gross total, and the CGST + SGST split for intra-state supply or IGST for inter-state supply. Runs entirely in your browser.

GST Calculator focuses on one practical job: add or remove GST at any slab and see the CGST/SGST or IGST split instantly. The workspace stays close to the top of the page, while the notes below explain how to review the result, when the tool is a good match, and what you should verify before using the output.

It takes you from enter the amount you want to work with to a finished result in a few clear steps, with controls for add GST (exclusive) and reverse/remove GST (inclusive) modes, all standard slabs — 3%, 5%, 12%, 18%, 28% — plus custom rates, cGST + SGST split for intra-state supply, iGST for inter-state supply. The final check is part of the workflow rather than an afterthought, so the result fits the place where you actually use it.

Processing Note

GST Calculator runs in your browser, so the input you enter is processed locally on this page and is not uploaded to a ToolMintX account.

Tool Limits

GST Calculator handles add or remove GST at any slab and see the CGST/SGST or IGST split instantly, but it cannot judge the full context behind your task. Finance calculators explain arithmetic and estimates. They are not professional financial, tax, legal, investment, or accounting advice.

Best Results

  • Start with the right input: enter the amount you want to work with
  • Use the main capability carefully: add GST (exclusive) and reverse/remove GST (inclusive) modes
  • Fine-tune all standard slabs — 3%, 5%, 12%, 18%, 28% — plus custom rates when the first output is close but not exact
  • Finish the workflow by confirming: select intra-state (CGST + SGST) or inter-state (IGST) to see the tax split

Where It Helps

  • You need GST Calculator when the job is to add or remove GST at any slab and see the CGST/SGST or IGST split instantly
  • The task specifically involves add GST (exclusive) and reverse/remove GST (inclusive) modes
  • You also need support for all standard slabs — 3%, 5%, 12%, 18%, 28% — plus custom rates
  • You already know the next step in the process, such as choose "Add GST" if the amount is before tax, or "Remove GST" if GST is already included

Before You Use the Output

For GST Calculator, the safest habit is to compare the output with your original goal of add or remove GST at any slab and see the CGST/SGST or IGST split instantly, then test it in the app, form, website, document, or message where it will actually be used. When in doubt, review entered numbers, local rules, due dates, tax or fee assumptions, and final totals before paying or sharing the result.

Key controls on this page include add GST (exclusive) and reverse/remove GST (inclusive) modes, all standard slabs — 3%, 5%, 12%, 18%, 28% — plus custom rates, cGST + SGST split for intra-state supply, iGST for inter-state supply.

Practical Workflow

A practical workflow for GST Calculator is to begin by enter the amount you want to work with. Next, choose "Add GST" if the amount is before tax, or "Remove GST" if GST is already included. Before finishing, pick the GST rate slab (or type a custom rate). Following that order keeps each action tied to the goal of add or remove GST at any slab and see the CGST/SGST or IGST split instantly.

The main value of GST Calculator is add or remove GST at any slab and see the CGST/SGST or IGST split instantly, so the tool should be used with a clear before-and-after check. Pay attention to controls such as add GST (exclusive) and reverse/remove GST (inclusive) modes, all standard slabs — 3%, 5%, 12%, 18%, 28% — plus custom rates, cGST + SGST split for intra-state supply because small settings can change the final result. If the output is going into a public page, official form, client file, school submission, or payment decision, test it in that destination before treating the task as complete.