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GST Calculator

Tax & Salary

Add or remove GST at any rate and split CGST/SGST.

Runs entirely in your browser — nothing is uploaded

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Features

  • Add GST to a net amount, or extract it from a gross figure.
  • Preset slabs of 5%, 12%, 18% and 28% plus any custom rate.
  • Automatic CGST/SGST split for intra-state supply, or IGST for inter-state.
  • Clear breakdown you can copy onto an invoice.

How to use the GST Calculator

  1. 1Enter the amount and choose whether GST is already included.
  2. 2Pick a tax slab or type a custom rate.
  3. 3Read the net, tax and gross breakdown.

Frequently asked questions

How is GST removed from an inclusive price?

Net = gross × 100 ÷ (100 + rate). For an 18% slab, a ₹1,180 gross price is ₹1,000 net plus ₹180 tax.

When is it CGST/SGST instead of IGST?

Intra-state supply splits the rate evenly between CGST and SGST. Inter-state supply is charged as a single IGST line at the full rate.

Which GST rate applies to what I sell?

The slabs are 0, 5, 12, 18 and 28 per cent, and the correct one is determined by the HSN or SAC code for your specific goods or service. Most services sit at 18 per cent. Because the classification decides the rate and misclassifying it is your liability, check the code rather than assuming the rate.

What is the reverse charge mechanism?

The case where the recipient pays GST directly to the government instead of the supplier collecting it, which applies to certain notified supplies and to most purchases from unregistered suppliers. It changes who remits the tax, not how much it is, so the arithmetic here still holds.