Tools
GST Calculator
Add or remove GST in seconds. Split CGST + SGST for within-state sales, or IGST for interstate — with all major Indian GST slabs.
Calculate GST
Enter amount and rate — see CGST/SGST or IGST split instantly.
Amount is
Supply type
GST rate (%)
Result
₹1,180.00
Total including GST
- Taxable value
- ₹1,000.00
- CGST (9%)
- ₹90.00
- SGST (9%)
- ₹90.00
- Total GST
- ₹180.00
- Amount before GST
- ₹1,000.00
For billing with automatic tax lines, HSN, and GSTR-ready reports, use Bill Souq GST billing.
How this GST calculator works
- Before GST (exclusive): Enter the taxable value; we add GST and show the total payable.
- Including GST (inclusive): Enter the MRP or invoice total; we back out the taxable value and tax components.
- Within state: Total GST is shown as equal CGST and SGST halves.
- Other state: Full GST is shown as IGST for interstate supply.
Common questions
How do I calculate GST on an amount?
If the price excludes GST, multiply by the rate (e.g. 18%) to get tax, then add to the base. If the price includes GST, divide by (1 + rate/100) to get the taxable value; the remainder is GST.
What is the difference between CGST, SGST, and IGST?
For sales within the same state, GST is split equally into CGST and SGST. For interstate sales, the full rate applies as IGST on the invoice.
Which GST rate should I use?
Common slabs are 5%, 12%, 18%, and 28% depending on the product or service HSN/SAC. Some items use 0%, 3%, or 0.25%. Confirm the correct rate for your goods with your CA or GST portal.
Need compliant invoices with stock, dues, and GSTR reports? Download Bill Souq or book a demo.
Stop calculating GST by hand on every bill
Bill Souq applies the right tax per item, prints thermal bills, and keeps books in sync — offline at the counter.