tax calculator
GST Calculator India
Calculate GST, IGST, CGST, and SGST instantly with add, reverse, and removal flows in one place.
Why this layout
Inputs, answers, and explainers are grouped for faster scanning on mobile and desktop.
Next step
Finish the calculation, then jump to a related tool without hunting through menus.
Calculate GST amount from base price
Unified GST - Single tax rate
GST Calculation Formula
Add GST Formula
GST Amount = (Original Cost x GST Rate) / 100
Net Price = Original Cost + GST Amount
Reverse GST Formula
Original Cost = Total Amount / (1 + GST Rate / 100)
GST Amount = Total Amount - Original Cost
Types of GST
CGST
Central Goods and Services Tax collected on intra-state sales.
SGST
State Goods and Services Tax collected on intra-state sales.
IGST
Integrated GST collected on inter-state sales and imports.
Need to extract tax from an inclusive invoice? Use the remove GST calculator or switch to the reverse tab above.
Frequently Asked Questions
What is the GST formula?
GST Amount = Base Amount x GST Rate / 100. Total Amount = Base Amount + GST Amount.
How do I calculate GST backwards?
Divide the total inclusive amount by 1 plus the GST rate, then subtract the result from the total amount to get the tax component.