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GST Calculator

Add or remove GST at any rate and see the base amount, tax and the CGST/SGST split. Everything runs in your browser.

Enter any amount greater than 0. Try 1000 as an example.

Pick a standard slab or type a custom rate between 0 and 100. Quick buttons help.

Exclusive adds GST on top, inclusive extracts GST from the total.

Formula: exclusive GST equals amount times rate divided by 100, total equals amount plus GST. Inclusive base equals amount times 100 divided by 100 plus rate, GST equals amount minus base. CGST and SGST split GST equally, for inter state use IGST.
All calculations run in your browser. No data is sent to a server. Change inputs on the left and the result on the right updates instantly.
GST amount₹180At 18% on base
Base amount₹1,000Before GST
Total₹1,180Base plus GST
CGST + SGST split₹90 + ₹90Each half of GST. For inter state, IGST equals ₹180.
GST split at 18%
Base 84.7%GST 15.3%

Visual split of base and GST in the total. Base is 84.7 percent, GST is 15.3 percent at 18% rate.

₹1,000 plus ₹180 GST at 18% (CGST ₹90 + SGST ₹90) comes to ₹1,180.

Enter amount and rate on the left, result updates live on the right. All math stays in your browser.

HOW TO USE

  1. 1Enter the amount on the left.
  2. 2Pick a GST rate on the left using the 0%, 5%, 12%, 18% or 28% buttons or type a custom rate.
  3. 3Toggle exclusive (add GST) or inclusive (remove GST) on the left.
  4. 4Read GST amount, base, total and the CGST/SGST split on the right. It updates live.

EXAMPLE

INPUT

₹1,000 at 18% GST (exclusive)

OUTPUT

GST ₹180 (CGST ₹90 + SGST ₹90), total ₹1,180

FAQ

What is the difference between GST inclusive and exclusive?
Exclusive adds GST on top of the base price; inclusive works backwards, the entered amount already contains GST and the base is derived from it.
Why does the calculator show CGST and SGST?
Intra-state sales split GST equally between CGST (central) and SGST (state). For inter-state sales the split is IGST, the total is the same.
Which GST rates are supported?
All standard Indian GST slabs: 0%, 5%, 12%, 18% and 28%. Enter any custom rate as well.
Is this suitable for invoices?
The tool shows the exact GST amount and net/gross values you need for invoices. Always verify with your accountant for filing.

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