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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