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GST Calculator — Add or Remove GST at Any Rate

Add GST to a price or work backwards from a GST-inclusive total, with the CGST/SGST split.

To add GST, multiply the amount by 1 plus the rate — ₹1,000 at 18% becomes ₹1,180. To remove GST from an inclusive total, divide by that same figure: ₹1,180 ÷ 1.18 = ₹1,000. Subtracting 18% from the inclusive total gives ₹967.60, which is wrong by ₹32.40 and is the most common error in this calculation.

Runs in your browser
Rates
0%, 0.25%, 3%, 5%, 12%, 18% and 28%
Split
Intra-state supplies divide equally into CGST and SGST
Privacy
Runs entirely in your browser — nothing is uploaded
Cost
Free, unlimited, no sign-up

Frequently asked questions

How do I remove GST from an inclusive price?

Divide by 1 plus the rate — not subtract the rate. At 18%, divide the total by 1.18. Subtracting 18% instead gives an answer roughly 3.2% too low, because you would be taking 18% of the inclusive figure rather than of the base.

What is the difference between CGST, SGST and IGST?

They are the same total tax split differently. A sale within one state splits into CGST for the centre and SGST for the state, half each. A sale across state lines is a single IGST charge at the full rate, which the centre later apportions. The buyer pays the same amount either way.

Which GST rate applies to my product?

That depends on its HSN or SAC code, and this calculator does not guess — it computes whichever rate you select. Most services sit at 18%, essentials at 5%, and luxury or demerit goods at 28% plus a cess that is separate from GST entirely.

How to use the gst calculator

  1. 1Set the amount.
  2. 2Choose the gst rate.
  3. 3Choose the calculate.
  4. 4Turn "Show the CGST / SGST split" on or off as needed.
  5. 5Choose the currency.
  6. 6The result appears immediately — copy or download it.

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Put the working gst calculator on your own site. It runs in your visitors' browsers exactly as it does here — free, no account, nothing uploaded.

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