GETAKA · FINANCIAL CALCULATORS

GST Calculator

Add GST to a price or work out the tax already included. Use the rate applicable to the item and invoice date.

The example inputs are ready. Select Calculate or replace them with your figures.

Add GST or remove GST

To add GST, multiply the base amount by the rate divided by 100. To remove GST, divide the inclusive amount by 1 + rate / 100; the difference is the included tax. Example: ₹1,000 before tax at an illustrative 18% becomes ₹1,180. Removing 18% from ₹1,180 returns a base of ₹1,000 and GST of ₹180.

Use the applicable rate

This is arithmetic, not an HSN/SAC classification or a live tax-rate database. Rates, exemptions, cess, place-of-supply rules and effective dates vary. The intra-state illustration divides the total GST equally between CGST and SGST or UTGST. Cess, reverse charge, discounts and invoice rounding policies are not modelled.

Check CBIC tax information and the GST Council notification directory. To prepare a document, use the GST invoice draft generator.

About this tool

Published by Getaka, a hobby publication with no professional finance background. Reviewed 28 September 2026. Report an error.

Getaka is not a SEBI-registered Research Analyst or Investment Adviser. Inputs are assumptions; this tool does not recommend investments or provide personal advice.