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GST Calculator

Add or remove GST (5%, 12%, 18%, 28%) from any amount instantly.

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Amount details

Add GST Remove GST

Result

Enter an amount to calculate GST.
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About this tool

Add GST to a base price to get the final billed amount, or remove GST from a total (GST-inclusive) amount to find the original base price — supports 5%, 12%, 18% and 28% slabs used in India.

How to use the GST Calculator

  1. Enter the amount in rupees — either the base price or the GST-inclusive total.
  2. Select the applicable GST slab: 5%, 12%, 18% or 28%.
  3. Choose whether you want to Add GST (to a base price) or Remove GST (from an inclusive total).
  4. Click Calculate to instantly see the base amount, GST amount and total — all broken down clearly.

Frequently asked questions

What GST rates does this support?

5%, 12%, 18% and 28% — the standard slabs used for most goods and services in India.

What's the difference between add and remove GST?

'Add GST' takes a base price and adds tax on top. 'Remove GST' takes a final price that already includes GST and extracts the base amount.

Is this GST calculator accurate for billing purposes?

Yes, it uses the exact standard formula (base × rate ÷ 100) used across Indian invoicing, but always cross-check with your accountant for official filings.

Do I need to sign up or pay to use this tool?

No, it's completely free, works instantly in your browser, and doesn't require any account or login.