How to use the GST calculator

1. Choose Add GST (net → gross) or Remove GST (gross → net).
2. Enter the amount and select the GST rate (0, 5, 12, 18, or 28%).
3. Pick CGST + SGST for sales within a state or IGST for inter-state sales.
4. Read the net, tax, and gross amounts plus the exact tax split for your invoice.

Example

A product priced at ₹10,000 with 18% GST (intra-state) costs ₹11,800 gross, split as CGST ₹900 + SGST ₹900. Removing GST from ₹11,800 gives back the ₹10,000 net.

Which rate applies?

India’s GST slabs are 0%, 5%, 12%, 18%, and 28%, assigned by product or service category — for example, many food items are 5%, most services 18%, and luxury goods 28%. Always confirm the correct slab for your item with the official GST rate schedule; this calculator does the maths, not the classification.

Frequently asked questions

What is the difference between CGST/SGST and IGST? Intra-state sales split the tax equally between centre and state (CGST + SGST); inter-state sales levy it as a single IGST.
How do I remove GST from a price? Divide the gross price by (1 + rate/100) — the calculator does this in “Remove GST” mode.
Is this suitable for invoices? Yes for the calculation; round as per your accounting practice (usually to 2 decimals).