Free GST calculator

Need to add GST to a price, or work out how much tax is already inside a GST-inclusive amount? The free GST Calculator is a standalone tool, separate from the Biller app -- no login, no signup.

What it does

1. Choose Add GST (your amount is before tax) or Remove GST (your amount already includes tax).
2. Enter the amount and pick a GST rate: 0%, 5%, 12%, 18% or 28%.
3. Choose whether the buyer is in the same state (CGST + SGST, split equally) or a different state (a single IGST line) -- the standard place-of-supply rule.
4. The taxable value, tax split and total update instantly as you type.

Nothing you type is saved anywhere or sent to a server; it only lives in your browser tab.

What it does not do

It only computes a tax split on one amount -- it does not generate an invoice, does not create an e-invoice/IRN, does not connect to the GST e-invoicing portal, and does not file anything with the GST department. Need an actual printable invoice? Use the free GST Invoice Generator instead.

Already running a restaurant/outlet on Biller?

You don't need this tool -- Biller computes and prints GST on every bill automatically. See GST billing.