GST Calculator

⚡ In shortAdd GST to a base price, or extract the GST already included in a total — free and instant, for any GST rate in India. To ADD GST: GST amount = price × rate%, and the total = price + GST. To REMOVE GST from a GST-inclusive amount: base = amount × 100 ÷ (100 + rate), and GST = amount − base. For an intra-state supply the GST splits equally into CGST and SGST (half each); for an inter-state supply it is a single IGST. Common rates are 5%, 12%, 18% and 28%.

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How it is calculated

To ADD GST: GST amount = price × rate%, and the total = price + GST. To REMOVE GST from a GST-inclusive amount: base = amount × 100 ÷ (100 + rate), and GST = amount − base. For an intra-state supply the GST splits equally into CGST and SGST (half each); for an inter-state supply it is a single IGST. Common rates are 5%, 12%, 18% and 28%.

Frequently asked questions

How do I remove GST from a total amount?

Divide the GST-inclusive amount by (100 + rate) and multiply by 100 to get the base price; the difference is the GST. For 18%, base = total × 100 ÷ 118.

What is the CGST and SGST split?

For a sale within the same state, GST is split equally into CGST and SGST (e.g. 18% = 9% CGST + 9% SGST). For an inter-state sale it is charged as a single IGST.

Is this GST calculator free?

Yes — it is completely free with no signup. It is for estimation; confirm the correct HSN/SAC rate for your goods or services before invoicing.