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GST Calculator (India) – Add/Remove GST, Reverse GST, CGST/SGST/IGST (Free Online)

GST Calculator (India) – Add/Remove GST, Reverse GST, CGST/SGST/IGST

Use this free GST Calculator to add GST to a base price, remove GST from an inclusive price, or do a reverse GST calculation instantly. Supports common rates 5%, 12%, 18%, 28% with CGST/SGST (intra-state) or IGST (inter-state) split. Everything runs in your browser—no data saved.

GST Calculator

How This GST Calculator Works

  • Exclusive (before GST): Adds GST to the base amount to get the invoice amount.
  • Inclusive (GST included): Reverses GST to find the base amount and tax from the invoice amount.
  • CGST/SGST for intra-state supplies (tax split equally), IGST for inter-state.
  • Supports 5%, 12%, 18%, 28% and a custom rate.

FAQ – GST Calculator (India)

How do I add GST to a price?

Select Exclusive, enter amount and rate, then click Calculate. The tool adds GST and shows invoice amount.

How do I remove GST from an inclusive price?

Select Inclusive and enter the invoice amount. The tool reverses GST to show base and tax.

When should I use CGST/SGST vs IGST?

Use CGST/SGST for intra-state supplies. Use IGST for inter-state supplies. Toggle the Supply Type accordingly.

Does this tool store my numbers?

No. Calculations run locally in your browser; nothing is uploaded or saved.

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