How to Use the GST Calculator
Enter the amount and select the GST rate (5%, 12%, 18%, 28%, or custom). Toggle between Add GST (exclusive price) and Remove GST (inclusive price). Select Intrastate for CGST+SGST split or Interstate for IGST.
GST Calculator Formula
Add: Total = Amount × (1 + Rate/100) | Remove: Base = Amount × 100/(100+Rate)CGST= GST amount ÷ 2 (intrastate, central share)SGST= GST amount ÷ 2 (intrastate, state share)IGST= Full GST amount (interstate transactions)
Example Calculation
Remove 18% GST from ₹1,180 (MRP inclusive of GST):
Base = 1180 × 100/118 = ₹1,000; GST = ₹180; CGST = ₹90; SGST = ₹90
Base price ₹1,000 + CGST ₹90 + SGST ₹90 = Total ₹1,180
Frequently Asked Questions
How do I remove GST from an inclusive price?
Base price = Inclusive price × 100 / (100 + GST%). GST amount = Inclusive price − Base price.
What is the difference between CGST, SGST, and IGST?
For intrastate transactions, GST is split equally between CGST (Central) and SGST (State). For interstate transactions, IGST applies, which equals the full GST rate.
Which goods attract 28% GST?
28% GST applies to luxury and sin goods including cars, motorcycles above 350cc, cement, aerated drinks, tobacco, and casino/lottery services.