GST Calculator — CalcPad.in

How GST Works

Adds GST or reverses GST from an inclusive amount. The calculator uses the visible inputs, applies the formula below, and rounds rupee outputs to whole numbers so the result is easy to read on mobile.

Formula

GST result = validated inputs → formula calculation → rounded Indian result

Inputs used:
  - Price
  - GST rate
  - Mode

Example Calculation

Example: enter ₹10,000 as net price and 18% GST. The calculator adds GST to show the invoice total and tax component. Switch modes if you already have an inclusive price and need to separate taxable value from GST.

India-Specific Assumptions

Business calculators ignore taxes and fees unless the input explicitly includes them.
Use invoice/accounting software for statutory filing decisions.
All rupee results are rounded to whole rupees for readability.
Inputs are treated as estimates; actual bank, employer, university, insurer, or tax-office calculations may differ.
The calculator uses Indian formats, slab concepts, and common FY 2025-26 assumptions where relevant.

Common questions

Yes. Use add mode when you know the pre-GST price and reverse mode when the price already includes GST.

Use the rate applicable to your product or service, such as 5%, 12%, 18%, or 28%. Check official classification for filing decisions.

The core result shows total GST. For intrastate invoices, total GST is usually split equally into CGST and SGST.

Use it for quick invoice math only. GST return filing should use your accounting records and official portal data.

Inclusive GST must be back-calculated because the tax is a percentage of the base value, not of the final price.

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Disclaimer: This calculator is for general informational and educational purposes only. It is not financial, tax, legal, academic, insurance, or professional advice. Verify important decisions with the relevant official source, employer, bank, university, insurer, or adviser.

Last updated: April 2026