GST Calculator
Add GST to a price or pull the tax out of an inclusive amount — with the CGST, SGST and IGST split shown instantly.
= ₹1,000
Within one state: CGST + SGST. Between two states: IGST (the full rate).
How to calculate GST in 3 steps
Pick 'Add GST' if you have a base price and want the final bill amount. Pick 'Remove GST' if you have an inclusive price (like a bill total) and want to know how much of it is tax.
Type your amount and tap a standard slab — 3%, 5%, 12%, 18% or 28% — or type any custom rate.
You get the base amount, the GST amount, the total, and the CGST/SGST/IGST breakup — updated live as you type.
Where this calculator helps
Work out the final invoice amount from your base price, with the exact CGST and SGST lines to print on the bill.
Got an inclusive price? Remove GST to see the true base value and how much tax you actually paid.
Quickly quote both 'with GST' and 'without GST' prices when a customer asks.
Cross-check tax amounts on purchases and sales before entering them in GSTR filings.
Benefits
- Handles both GST-exclusive (add) and GST-inclusive (remove/reverse) amounts.
- One-tap buttons for all common slabs: 3%, 5%, 12%, 18%, 28% — plus any custom rate.
- Automatic CGST + SGST split for intra-state and IGST for inter-state sales.
- Runs entirely in your browser — your amounts never leave your device.
Calculators for each GST slab
Frequently asked questions
How is GST calculated on a price?
To add GST: GST amount = base price × rate ÷ 100, and the total = base price + GST. For example, ₹1,000 at 18% GST gives ₹180 tax and a total of ₹1,180.
How do I remove GST from an inclusive amount?
Use the reverse formula: base price = inclusive amount × 100 ÷ (100 + rate). For example, if a bill of ₹1,180 includes 18% GST, the base is ₹1,000 and the GST portion is ₹180. The 'Remove GST' mode does this for you.
What are the GST rates in India?
The main GST slabs are 5%, 12%, 18% and 28%, with a special 3% rate for gold and some items at 0%. Rates can change with GST Council decisions, so always confirm the current rate for your product or service (HSN/SAC code) before billing.
What is the difference between CGST, SGST and IGST?
For a sale within the same state, GST is split equally into CGST (central) and SGST (state) — 18% becomes 9% + 9%. For a sale between two states, the full rate is charged as a single IGST. The total tax is the same either way.
Is this GST calculator free?
Yes. It's completely free with no sign-up. Everything is calculated in your browser, so the amounts you enter are never uploaded or stored anywhere.
Can I use this for reverse GST calculation?
Yes. Switch to 'Remove GST' mode, enter the GST-inclusive amount and the rate, and you'll instantly see the base value and the exact tax portion — this is exactly what a reverse GST calculator does.
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