Question 1

How do I calculate GST from a GST-inclusive amount?

Accepted Answer

Tick "Amount includes GST" — the calculator back-calculates the base amount and GST for you.

Question 2

What's the difference between CGST+SGST and IGST?

Accepted Answer

Within the same state: GST splits equally into CGST (Central) and SGST (State). Between states: IGST applies as a single charge.

Question 3

Can I use a custom GST rate?

Accepted Answer

Yes — select "Custom" and type any rate like 3%, 7.5%, or 0.1%.

Question 4

How accurate are the calculations?

Accepted Answer

All calculations use precise floating-point math. Results match what CA/accounting software would produce.

Question 5

How do I use this GST Calculator India online free?

Accepted Answer

Enter your numbers above and get instant results. Free with no login, works on mobile and desktop.

Question 6

Is this GST Calculator India accurate?

Accepted Answer

Yes. The GST Calculator India uses standard formulas and 2026 rules. Always verify big decisions with a professional.