GST Calculator
Add GST to a net price or extract GST from a gross price. Works with any rate, with quick presets for the common 5%, 12%, 18% and 28% slabs.
Enter your values
Result
How to use
Step-by-step guide for this tool
View steps ⟶Related tools
More calculators like this one
Browse ⟶Save result
Copy, share or print your result
Save ⟶How to use the GST Calculator
- 1Enter amount in the form on the left.
- 2Fill in the remaining fields — the result updates automatically as you type.
- 3Review the highlighted result and the supporting breakdown on the right.
- 4Use Copy, Share or Print to save or send your result.
Adding vs. removing GST
Adding GST is simple multiplication: gross = net × (1 + rate/100). Removing GST from an inclusive price is where people slip up — you divide, not subtract the percentage: net = gross ÷ (1 + rate/100). From ₹1,180 at 18%, the net is 1180 ÷ 1.18 = ₹1,000, not 1180 − 18%.
In India, intra-state sales split GST equally into CGST (central) and SGST (state) — a 18% rate becomes 9% + 9% — while inter-state sales charge the full rate as IGST.
Frequently Asked Questions
▸How do I remove GST from a total?
Divide the gross amount by (1 + rate/100). For 18% GST: divide by 1.18. The GST portion is the gross minus that result.
▸What are CGST, SGST and IGST?
For sales within an Indian state, GST splits equally into central (CGST) and state (SGST) halves. Inter-state sales charge the whole amount as integrated GST (IGST).