Add GST to an amount or remove it from a GST-inclusive amount, locally in your browser - at the three current GST 2.0 slabs 5/18/40%, no upload.
Updated for tax year 2026
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
GST (Goods and Services Tax) is India's nationwide sales tax, introduced in 2017 to replace the earlier patchwork of state and central taxes (VAT, Service Tax, Excise Duty and others). Under the GST 2.0 reform (effective since 22 September 2025), the GST Council now sets one of three standard rates - 5, 18 or 40 percent - for most goods and services; the earlier 12% and 28% slabs were abolished, and the new 40% rate applies to sin/luxury goods such as tobacco, pan masala, high-end cars/SUVs and aerated drinks (narrower special rates, e.g. for precious metals, exist too but are deliberately not modelled here). This calculator works in both directions: add GST to a net amount, or back it out of a GST-inclusive gross amount.
The calculation runs entirely locally in your browser, in pure JavaScript - nothing is uploaded or stored. Adding GST: gross = net x (1 + rate); removing it: net = gross / (1 + rate); the GST amount is the difference either way. Change the amount, rate or direction and the net amount, GST amount and gross amount update instantly.
An honest note: this is a plain calculation aid for the three standard slabs, not tax advice and not a substitute for an invoice compliant with the CGST/SGST Act. The split into CGST and SGST for intra-state supplies (each half the rate) versus IGST for inter-state supplies is not shown separately - only the total GST amount.
| Input formats | Form inputs (no file) |
|---|---|
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: A plain calculation aid for the three current GST slabs (5/18/40%, GST 2.0 effective since 22 September 2025) in both directions. Not modelled: the special rates (e.g. for precious metals), the CGST/SGST/IGST split, or invoice-format compliance. Not tax advice.
No. The calculation runs entirely locally in your browser (pure JavaScript); nothing is sent or stored.
The three current standard rates: 5, 18 and 40 percent (GST 2.0, effective since 22 September 2025 - the earlier 12% and 28% slabs were abolished). Narrower special rates (e.g. 0.25% or 3% for certain precious metals/diamonds) are deliberately not modelled here.
"Add" takes a net amount and works out the gross amount including GST. "Remove" takes an amount that already includes GST and splits it back into the net and GST portions.
No, it shows only the total GST amount. For intra-state supplies that splits evenly into CGST and SGST; for inter-state supplies the full rate is IGST.
Yes. After the first load, the calculation works entirely without an internet connection.
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