The GST Calculator adds GST to a price or removes it from a GST-inclusive price, at the standard slabs of 5%, 12%, 18% and 28% — and shows the CGST and SGST split that Indian bills require. It is the calculation to do before making any bill or quotation.
What is the CGST/SGST split?
For sales within one state, the GST is split equally between the Centre (CGST) and the State (SGST) — an 18% slab shows as 9% + 9%. For sales to another state the full amount is IGST instead; the total tax is the same.
How do I find the base price from a bill total?
Use the 'remove GST' mode: enter the bill total and the slab, and the calculator separates the base price from the tax. Dividing the total by 1.18 (for an 18% slab) gives the same base.
Do I need to sign up or install anything?
No. The GST Calculator is completely free, needs no account and nothing to install — it runs in your browser, and anything you type stays on your device.