Business Calculator
GST Calculator
Add GST to a net price or extract GST from a gross price. CGST + SGST breakdown automatic.
What is GST?
A GST calculator helps you compute GST on any transaction, add GST to a base price, or extract GST from a final price, at any of India's standard rates (5/12/18/28%).
Formula
Add: GST = Net × Rate / 100; Gross = Net + GST
Remove: Net = Gross / (1 + Rate / 100); GST = Gross − Net
Remove: Net = Gross / (1 + Rate / 100); GST = Gross − Net
Worked example
₹
Base ₹10,000 at 18% GST: CGST ₹900 + SGST ₹900 + Gross ₹11,800. Reverse, ₹11,800 gross at 18% → net ₹10,000, GST ₹1,800.
Frequently asked questions
CGST vs SGST vs IGST?
Intra-state: CGST + SGST (half each). Inter-state: full IGST. Our calculator assumes intra-state for the donut split.
Common GST rates in India?
5% (essentials), 12% (standard household), 18% (most services/goods), 28% (luxury/demerit).
How is GST input credit claimed?
Registered businesses offset output GST with input GST on purchases. Filing via GSTR-2B + GSTR-3B monthly.