Free Tool · Astra Atlas
GST Calculator — CGST, SGST & IGST Breakdown
Calculate GST amount instantly with CGST/SGST split for intra-state sales or IGST for inter-state sales. Works for both GST-inclusive and GST-exclusive prices.
Base Price
₹1,000.00
CGST (9%)
₹90.00
SGST (9%)
₹90.00
Total
₹1,180.00
Never calculate GST by hand again
Astra Atlas auto-applies the right GST rate on every invoice, generates GSTR-1/3B ready reports, and handles e-invoicing. Free forever plan.
Frequently asked questions
How is GST calculated?
GST-exclusive: GST amount = base price × GST rate. GST-inclusive: base price = total ÷ (1 + GST rate), then GST amount = total − base price.
When do I charge CGST+SGST vs IGST?
CGST+SGST apply when the buyer and seller are in the same state (intra-state sale). IGST applies when they are in different states (inter-state sale). CGST and SGST are always equal halves of the total GST.
What are the GST rate slabs in India?
Common slabs are 0%, 0.25%, 3%, 5%, 12%, 18% and 28%, depending on the HSN/SAC code of the goods or service.
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