Free finance calculator
GST Calculator
Estimate GST from an exclusive or inclusive quoted amount. The calculator shows simple arithmetic only; whether CGST/SGST or IGST applies, the rate, exemptions, registration, and invoice requirements depend on the actual supply.
Calculate GST on a quoted amount
Choose whether the amount you entered already includes GST.
Taxable value
₹1,000.00
Value before GST.
GST amount
₹180.00
Illustrative CGST ₹90.00 + SGST ₹90.00 for an intra-State supply.
Invoice total
₹1,180.00
Amount after the selected GST rate.
This is an arithmetic estimate. GST registration, place of supply, rate, exemptions, input credit, and invoicing obligations depend on the transaction. Confirm them with the applicable official guidance or a tax professional.
How to use this tool
- 1Enter the amount and the GST rate you want to estimate.
- 2Choose whether the amount already includes GST.
- 3Check the taxable value, GST amount, and total against the transaction and applicable official guidance.
Frequently asked questions
Does this calculator decide whether CGST, SGST, or IGST applies?
No. It shows an illustrative equal CGST/SGST split for an intra-State supply. Place of supply and other GST rules determine the actual tax treatment.
Can I use this result as a tax invoice?
No. It is a calculation aid, not a tax invoice or a GST return. Confirm invoice particulars and tax treatment before issuing an invoice or making a GST claim.