GST
Calculator.
Add GST to a net amount or extract it from a gross. Supports the standard Indian slabs and a custom rate, with the CGST + SGST split shown for intra-state transactions.
GST formulas
Add GST : Gross = Net × (1 + r/100); GST = Gross − Net Extract GST : Net = Gross / (1 + r/100); GST = Gross − Net For intra-state, CGST = SGST = GST / 2.
Frequently asked questions
What does GST Calculator do?
Add or remove GST at any rate with a clean breakdown. The whole thing runs in your browser tab, so it is ready the moment the page finishes loading.
Is GST Calculator free to use?
Yes. GST Calculator is completely free on ToolMunch — no trial, no premium tier holding back the main feature, and no daily or hourly cap on how many times you can use it.
Do I need to create an account or sign up?
No. There is no account, no email address, and no login. Open GST Calculator, do the job, and take the result — nothing is gated behind a signup form.
Are the numbers I enter sent to a server?
No. GST Calculator runs entirely inside your browser tab, so what you type never leaves your own device. Nothing is uploaded, which means there is no copy of it on a server to worry about.
Does GST Calculator work on Mac, Windows, and phones?
Yes. GST Calculator runs in any modern web browser on Windows, macOS, Linux, Chromebook, Android, and iOS. There is nothing to download or install.
Can I use it as many times as I want?
Yes. There is no queue, no per-hour quota, and no counter that runs out — run GST Calculator as often as the work needs.