Tools · GST Calculator
GST Calculator
Calculate CGST, SGST, or IGST on any invoice. Switch between exclusive and inclusive of GST. Works for all standard rates.
Result
For estimates only. Actual invoices must be generated through the GST portal or your accounting software with proper HSN/SAC codes and GSTIN details.
Common questions
What's the difference between CGST, SGST, and IGST?
On intra-state sales (within one state), the GST is split equally between CGST (collected by the centre) and SGST (collected by the state). On inter-state sales (across state lines, or imports), the entire GST is charged as IGST, collected by the centre and shared with the destination state.
How do I calculate GST if the price is inclusive of GST?
Use the formula: GST amount = (Total ÷ (100 + rate)) × rate. For example on ₹1,180 inclusive of 18% GST → GST = (1180 ÷ 118) × 18 = ₹180, and base = ₹1,000. The calculator above does this for you when you pick the 'Inclusive' option.
What GST rate applies to my product?
Most goods fall under 5%, 12%, 18%, or 28%. Essential items are at 0% (nil-rated) or exempt. Services are usually 18%. To find the exact rate for your product, use our HSN code lookup tool.
Is this calculator official?
It uses the standard GST formula prescribed by the CGST Act 2017. For your actual invoice generation, file via the GST portal or accounting software — our tool is for quick estimates only.
Need help with GST registration or monthly filing?
Our CA team handles registration in 3-7 days and full GST return filing monthly.
Talk to our GST team