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GST Calculator

Add or remove GST across all Indian slabs with a clear CGST/SGST breakdown.

FreeNo loginBrowser basedPrivacy friendly
By MerQPrime Editorial TeamUpdated 2026-06-20Reviewed 2026-06-20Editorial policy
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Overview

About the GST Calculator

Calculate Goods and Services Tax the easy way. Add GST to a base price or work out the GST already included in a gross amount, choose any standard Indian slab, and see a clear CGST, SGST and IGST breakdown.

Benefits

How it works

  1. 1Enter the amount you want to calculate from.
  2. 2Choose whether to add GST to it or remove GST from it.
  3. 3Select the applicable GST slab (5%, 12%, 18%, 28% or a custom rate).
  4. 4Instantly see the tax amount, net price and CGST/SGST/IGST split.

Applications

Use cases

  • Prepare GST-compliant invoices and quotations.
  • Work out the pre-tax cost of a GST-inclusive price.
  • Split tax into CGST and SGST for intra-state transactions.
  • Double-check supplier bills and receipts.

Support

Frequently asked questions

What's the difference between adding and removing GST?
Adding GST calculates the tax on top of a base (exclusive) amount. Removing GST extracts the tax that is already included in a gross (inclusive) amount.
How are CGST and SGST calculated?
For intra-state supplies the total GST is split equally into CGST and SGST. For inter-state supplies the full amount is charged as IGST.
Which GST slabs are supported?
The standard Indian slabs of 5%, 12%, 18% and 28% are built in, and you can also enter a custom rate.

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Related tools, guides & pages

GST Calculator India – Add, Remove & Split CGST/SGST