About GSTCalc
GSTCalc.in is a free GST calculator for India, updated for the 2026-27 slabs. It does one job: work out what tax applies to an amount, split it correctly into CGST, SGST or IGST, and show the result without asking you to sign up for anything.
Why it exists
The September 2025 GST restructuring collapsed the old 12% and 28% slabs into a four-rate system — 0%, 5%, 18% and 40%. Most rate tables online still show the old structure, and AI chatbots confidently quote pre-2025 rates because their training data predates the change. If you are checking a bill or drafting an invoice, that is a real problem.
This site was built as a straightforward answer: current slabs, a searchable list of everyday items, and arithmetic you can check yourself.
Who builds it
GSTCalc is built and maintained by Harshit Varshney, a Python backend developer working on APIs and AI-powered applications. It started as a personal project and is run as one — there is no company behind it, no team, and no investor.
That is worth stating plainly because it tells you what to expect: fixes usually land quickly, but this is not a professional tax service and should not be treated as one. If you would like to work together on something, the collaborate page has the details.
Where the rate data comes from
The rate list covers 125 everyday products and services, mapped to slabs and grouped by category, including four that sit outside GST entirely. It is compiled and hand-maintained against GST Council decisions and CBIC notifications following the 2025 restructuring.
Two honest limitations:
- It is a plain-language reference, not the legal schedule. The official rate for a specific transaction depends on HSN/SAC classification, packaging, branding and turnover thresholds. A category list cannot capture all of that.
- Rates change. The GST Council revises them, and there is a lag between a notification and this site reflecting it.
For anything with money attached — filing, invoicing, a disputed bill — confirm against the current CBIC notification or ask a qualified tax professional. If you spot a rate that looks wrong, tell us; corrections get priority.
How your data is handled
Nothing you type is sent anywhere. The calculator runs entirely in your browser — amounts, invoice rows and search terms never leave your device, and there is no account, no login and no server storing your calculations.
The site stores three small preferences locally in your browser: dark mode, your language choice, and whether you have dismissed the tip bar. Anonymised traffic statistics are collected via Google Analytics. Full detail is in the privacy policy.
How it is built
Plain HTML, CSS and JavaScript — no frameworks, no build step, no runtime dependencies. It is a progressive web app, so you can install it to your home screen and it keeps working offline. It is available in English and Hindi.
If you run a website and want the calculator on it, there is a free embeddable widget that takes one line of code.
Contact
Corrections, bug reports and questions are welcome at contact@gstcalc.in, or through the contact page.