GST Calculator
Add or remove GST from an amount.
About this tool
This GST calculator adds GST to a pre-tax amount or estimates the base amount and included GST from a GST-inclusive price. Choose the mode carefully so you do not add tax to an amount that already includes it.
How to use this calculator
- Enter the amount.
- Enter the GST rate supplied for the goods or service.
- Choose Add GST for a pre-tax amount or Remove GST for a tax-inclusive amount, then calculate.
Formula
Worked example
At an illustrative 18% rate, ₹1,000 before GST becomes ₹1,180. If ₹1,180 already includes 18% GST, the base is ₹1,000 and GST is ₹180.
Frequently asked questions
How do I add GST to a price?
Multiply the pre-tax amount by the applicable rate, then add the GST amount to the base price.
How do I remove GST from an inclusive price?
Divide the inclusive amount by 1 + the GST rate expressed as a decimal. Subtract the resulting base amount from the inclusive total to find the tax component.
Does this choose the correct GST rate for my product?
No. You must enter the applicable rate. GST classification and rates depend on the supply and current rules; verify official guidance or consult a tax professional.
Does the result split CGST and SGST?
No. This tool estimates the total GST component only. It does not determine whether a transaction is intra-state or inter-state or provide a return-ready tax calculation.
SolveKit provides general calculations for information and planning. Results depend on the values and assumptions entered. For financial, investment, payroll or tax decisions, confirm the applicable product terms and current rules with an authoritative source or qualified professional.