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🇮🇳 India GST Calculator

Add or remove Indian GST at 5%, 12%, 18%, 28% or custom, with CGST/SGST or IGST split.

How to use: India GST Calculator

Add or remove Indian GST at 5%, 12%, 18%, 28% or custom, with CGST/SGST or IGST split. Everything happens inside your browser on your own device. Your files, numbers and text are never uploaded, there are no accounts, cookies or trackers, and closing the tab removes the data.

Common uses

Adding 18% GST to an invoice
Finding the base price inside a GST-inclusive bill
Splitting tax into CGST and SGST or IGST

Step by step

Enter the amount.
Pick the rate and supply type.
Choose add or remove GST.

Worked example

For example, 1,000 at 18% gives GST of 180 (CGST 90 + SGST 90 within a state, or IGST 180 between states) and a total of 1,180.

Tips for better results

Double-check the numbers you type, especially decimal points and the rate. The results follow standard formulas and published rules, but your contract, bank or tax authority has the final word, so use the figures as a careful estimate. The page is designed for phones first, so it works on a 375-pixel screen as well as on a desktop.

Good to know

The calculation updates as you type, and nothing you enter is saved or sent anywhere. Amounts are rounded for display to two decimal places, so a total may differ by a fraction from a bank statement. Tax rates, social insurance rules and labour laws change from time to time; we update the tool when official rules change, but always check the current rule for a large or legal decision.

Why a browser-based tool?

Many online tools upload whatever you give them to a remote server, process it there and send it back. That is slower on a weak mobile connection and means a copy of your document, photo or figures sits on someone else’s computer. Free Adawat works differently: the code is downloaded once, then the work happens on your phone or computer. That keeps personal papers such as passports, visas, salary slips and contracts private, and it also means there is no queue, no file count limit and no waiting for a download link.

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FAQ

CGST/SGST vs IGST?

Intra-state supply splits GST equally into CGST and SGST; inter-state supply uses IGST.

Are slabs up to date?

Always confirm the official rate for your item.

Is India GST Calculator free?

Yes. It is completely free, with no sign-up, no watermark and no daily limit. The only limit is your device memory for very large files.

Are my files or data uploaded?

No. All processing happens in your browser on your device. Nothing you enter or select is sent to a server.

Does it work on a phone?

Yes. It works in modern mobile browsers on Android and iPhone, and on tablets and computers.

Does it work without internet?

Once the page has fully loaded, the tool runs on your device, so it keeps working if the connection drops. Pages you have visited before can often open offline too.

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