GST Calculator: Inputs, Options, and How to Read the Results

Inputs and options

The GST Calculator is an input-based calculator — you type values directly in your browser. Nothing is uploaded.

Input	What to enter
Mode	Exclusive (add GST on top) or Inclusive (GST already inside)
Amount	The base price or the GST-inclusive total
Rate	The applicable GST slab — 5%, 12%, 18%, or 28%

Rate selector — pick any of the four standard Indian GST slabs
Mode toggle — switch between exclusive and inclusive to reverse the calculation
Breakdown view — the result always shows base amount, GST amount, and total

Confirm whether your price is exclusive or inclusive before you start so the calculation runs in the right direction
Apply the correct slab — essentials often sit at 5% or 12%, standard goods at 18%, and luxury and sin goods at 28%
Use the inclusive mode when checking supplier invoices so you see the true base price and the tax embedded in the total

The GST Calculator takes a mode, an amount, and a rate, and returns a clean base + GST + total breakdown for any Indian slab.

Frequently asked questions

A mode (exclusive or inclusive), the amount, and a GST slab rate of 5%, 12%, 18%, or 28%.

The tool instantly reverses the calculation — from adding GST on top to extracting the base and tax from an inclusive total.

It depends on the goods or service. Essentials are often 5% or 12%, standard goods 18%, and luxury or sin goods 28%.