GST Calculator
This GST calculator adds GST to a base price or removes it from a GST-inclusive total, at 5%, 12%, 18%, 28% or any custom rate, with the CGST + SGST split shown automatically. Type an amount, tap a rate, done — it all runs on your device.
- Nothing you type leaves this page
- Works offline once loaded
- Free forever, no signup
Preparing GST Calculator for you…
Loading the tool into your browser. Nothing is uploaded — the work happens on your device.
Your amount is the base price — GST gets added on top. Your amount already includes GST (like an MRP) — the tool extracts the base price and tax.
{{ mode === 'add' ? 'Total with GST' : 'Base price without GST' }}
{{ mode === 'add' ? inr(result.total) : inr(result.base) }}
| Base price | {{ inr(result.base) }} |
|---|---|
| CGST ({{ activeRate / 2 }}%) | {{ inr(result.cgst) }} |
| SGST ({{ activeRate / 2 }}%) | {{ inr(result.sgst) }} |
| Total GST ({{ activeRate }}%) | {{ inr(result.gst) }} |
| Total | {{ inr(result.total) }} |
Within a state, GST splits equally into CGST + SGST. Interstate supplies charge a single IGST at the full rate instead.
How to use this tool
-
Enter the amount
The base price if you are adding GST, or the GST-inclusive total (like an MRP or invoice total) if you are removing it.
-
Choose Add or Remove GST
Add computes tax on top of your amount; Remove extracts the base price and tax hidden inside an inclusive total.
-
Tap a rate and read the split
Pick 5%, 12%, 18%, 28% or type a custom rate — the base, CGST, SGST and total appear instantly, with a copy button for the full breakup.
Questions people ask
How do I remove GST from a total price?
Divide the inclusive amount by (1 + rate/100). For example, ₹1,180 at 18% → base ₹1,000 and GST ₹180 (CGST ₹90 + SGST ₹90). The Remove mode on this calculator does this instantly for any rate.
How is GST calculated on a base price?
Multiply the base by the rate: ₹1,000 at 18% adds ₹180 of GST for a total of ₹1,180. Within a state that ₹180 splits equally into ₹90 CGST and ₹90 SGST.
What is the difference between CGST, SGST and IGST?
On a sale within a state, the GST splits equally between the centre (CGST) and the state (SGST). On an interstate sale, a single IGST is charged at the full rate instead — the total tax is the same either way.
How do I calculate GST on an MRP?
MRP is always GST-inclusive, so use Remove mode: enter the MRP and the applicable rate, and the calculator shows the base price and the tax portion inside it.
Which GST rate should I pick?
Use the rate printed on your invoice or the rate notified for your goods or service — the common slabs are 5%, 12%, 18% and 28%, and the custom field accepts special rates like 0.25% or 3%. When in doubt, check the GST rate finder on the official CBIC site.
Is this GST calculator free and private?
Yes — no login, no upload. Every calculation happens in your browser and the page works offline after it loads.
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