🧾GST Calculator
Add or remove GST at 5%, 12%, 18% or 28%.
Disclaimer: These tools provide estimates for general information and educational use only. They are not financial, investment, tax or legal advice. Results can differ from your bank or provider's actual figures — please verify important decisions with a qualified financial professional.
About the GST Calculator
Free GST calculator for India. Add GST to a base amount or remove GST from a total, at 5%, 12%, 18% or 28% slabs, and see the CGST + SGST split instantly. Perfect for invoices, shopping and business.
How to use the GST Calculator
- 1Enter your numbers into the GST Calculator fields above.
- 2Adjust the rate, period, units or other options to match your situation.
- 3Your result is calculated instantly as you type — there's no submit button.
- 4Nothing is stored or uploaded; every calculation runs privately in your browser.
Why use this tool?
Private by design
The GST Calculator runs entirely in your browser — nothing you enter is uploaded to a server.
Free, no signup
Use it as much as you like. There's no account, no paywall and no watermark.
Fast & instant
Results appear the moment you type or click — no waiting, no page reloads.
Works anywhere
Any device or browser, even offline once the page has loaded.
Frequently asked questions
How do I add GST to an amount?＋
Enter the base amount and pick the GST rate (5%, 12%, 18% or 28%). The tool shows the GST and the total price including GST.
How do I remove GST from a total?＋
Switch to 'Remove GST' mode and enter the GST-inclusive amount — it calculates the original base price and the GST portion.
What are CGST and SGST?＋
For sales within the same state, GST is split equally into CGST (central) and SGST (state). The tool shows this split automatically.