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Tax tools

GST Calculator

Add GST to a base amount, or work backwards from a GST-inclusive total. Includes CGST/SGST and IGST breakdowns.

₹
Result
Base amount₹1,00,000.00
GST amount₹18,000.00
CGST₹9,000.00
SGST₹9,000.00
Total amount₹1,18,000.00

Frequently asked questions

What's the difference between CGST, SGST, and IGST?

For sales within the same state, GST is split equally between CGST (central) and SGST (state). For inter-state sales, the full amount is charged as IGST instead.

How do I remove GST from a total amount?

Switch to 'Remove GST' mode and enter the total amount including GST. The calculator extracts the base amount and GST portion using the formula: base = total × 100 / (100 + rate).

Which GST rate applies to my business?

Rates vary by category — most services are taxed at 18%, while many goods fall under 5%, 12%, or 28%. Check your HSN/SAC code on the GST portal to confirm your applicable rate.