GST Calculator
Add or remove GST at any standard rate, with an automatic CGST/SGST or IGST split.
Runs in your browser. Nothing is uploaded.GST Calculator in 3 steps
Enter the amount and rate
Type an amount and pick the applicable GST rate — 5%, 12%, 18%, 28% or another standard slab.
Choose add or remove
"Add GST" treats your amount as before tax; "Remove GST" treats it as already including tax.
Pick the supply type
Intra-state splits the tax into CGST + SGST; inter-state shows it as a single IGST amount.
Why use this GST Calculator
Questions about this tool
What is the difference between CGST, SGST and IGST?
For a sale within the same state, GST is split equally between CGST (central) and SGST (state) — each is half the total rate. For a sale between different states, the full rate is charged as a single IGST (integrated GST) instead.
How does "Remove GST" work?
If your amount already includes GST, this mode divides it by (1 + rate/100) to find the original base amount, then shows the tax as the difference — useful when you have a final price and need to know the pre-tax value.
Which GST rate should I use?
Rates depend on the specific goods or service under Indian GST law — 5%, 12%, 18% and 28% are the most common slabs, with 0.25% and 3% applying to specific categories like precious stones and gold. Check current official rates for your exact item.
Is this specific to Indian GST?
Yes, the slabs and CGST/SGST/IGST structure follow India's GST system. The underlying add/remove tax math would work for a general sales tax too, just without the specific slab presets.