GST
GST Calculator
Add GST to a tax-exclusive price, or back GST out of a tax-inclusive price, using the rate you enter.
GST in this calculator
Cess, reverse charge, composition scheme and input tax credit are not modelled. Rounding on tax invoices can differ by a rupee.
GST formulas
Exclusive: GST = Amount × r; Inclusive: GST = Amount × r / (1 + r)
r is the GST rate as a decimal (for 18%, r = 0.18).
Frequently asked questions
Which GST rate should I use?
Use the rate that applies to that supply. This tool does not look up HSN codes or notifications.
What is inclusive vs exclusive?
Exclusive adds tax on top of the amount. Inclusive treats the amount as the invoice total and splits out GST.
Are these tax figures current law?
No. Slabs, rebates and deductions are illustrative assumptions with a last-updated date. They are not verified as current. Confirm on the Income Tax Department website or with a professional before filing.
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SmartCalculators provides educational calculators and estimates. Results are for informational purposes only and should not be considered financial, tax, investment, legal or professional advice.