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Add or remove GST from a price, and split the tax into CGST/SGST or IGST. Supports 5%, 12%, 18%, 28%, and custom rates, calculated instantly in your browser.
Calculate GST now–
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This calculator adds GST to a base price or removes GST from a tax-inclusive price, and splits the tax into CGST and SGST for intrastate sales or shows it as IGST for interstate sales. It supports the common Indian GST slabs plus any custom rate.
Work forward from a base price or backward from a tax-inclusive price.
Switch between intrastate and interstate supply to see the correct tax breakdown.
Use the common 5%, 12%, 18%, 28% slabs, or enter any custom rate.
All calculations happen locally in your browser.
| Scenario | Input | Result |
|---|---|---|
| Add 18% GST, intrastate | Base: ₹1,000 | CGST ₹90 + SGST ₹90 = Total ₹1,180 |
| Remove 18% GST | Inclusive price: ₹1,180 | Base ₹1,000, GST ₹180 |
| Add 18% GST, interstate | Base: ₹1,000 | IGST ₹180 = Total ₹1,180 |
Adding GST starts from a base price and calculates the tax and total on top of it. Removing GST starts from a tax-inclusive price and works backward to find the original base amount and the tax portion within it.
For sales within the same state, GST is split equally into CGST (central tax) and SGST (state tax). For sales between different states, the full amount is charged as IGST (integrated tax) instead.
The common Indian GST slabs of 5%, 12%, 18%, and 28% are built in, plus a custom rate field for any other percentage.
The base amount is the inclusive price divided by (1 + GST rate / 100). The difference between the inclusive price and this base amount is the GST amount.
No. This calculator is a quick estimation tool for everyday pricing and invoicing. For filing returns or compliance decisions, confirm figures with a qualified accountant or the official GST portal.
No. All calculations run locally in your browser using client-side JavaScript. Nothing you enter is sent to a server.