Free GST tools for Indian businesses
Work out GST, check a GST number, make a proper tax invoice and keep track of every filing date — free, with no sign-up, and nothing you type is stored.
GST Calculator
Add GST to a price or take it out of one, at the GST 2.0 rates, and see the split into CGST and SGST or IGST. Works for any amount, to the paisa.
Calculate GSTGSTIN Checker
Check that a 15-character GST number is correctly formed — state code, PAN and check digit — before it goes on an invoice. It runs in your browser and looks nothing up.
Check a GSTINGST Invoice Format
A GST tax invoice template in Excel and PDF with every field Rule 46 requires. The Excel version works out the tax and totals as you type.
Get the templateGST Due Dates
Every GST return date for the year — monthly and quarterly — plus TDS, PF, ESI and advance tax. See what is due next and download the dates to your calendar.
See the datesWhy these tools are free
They answer the questions Indian businesses and their accountants look up every week — what is the GST on this amount, is this GSTIN right, what must an invoice show, when is GSTR-3B due. Each tool does one job properly and shows its working, so you can rely on the answer and explain it to someone else.
They are made by the team behind Finvosmart, which does the same work inside your books every day: the right GST on every invoice line, GSTR-1 and GSTR-3B prepared from your records, and the coming due dates on your dashboard.
Your data stays with you
The calculator, the GSTIN checker and the due-date planner run entirely in your browser: nothing you type is sent to us or stored. The invoice templates are ordinary files — fill them in on your own computer.
Frequently asked questions
Are these GST tools really free?
Yes. There is no sign-up, no limit on how often you use them, and no trial that runs out. They are free because they are useful, and because some of the people who use them later try Finvosmart.
Do you store what I enter?
No. The GST calculator, the GSTIN checker and the due-date planner work entirely in your browser — nothing is sent anywhere. The invoice templates are files you download and fill in yourself.
Can I add the GST calculator to my own website?
Yes. The calculator page has a short piece of code to copy into your site, in a light or dark style. It shows the full calculator, and a link back to Finvosmart sits under it.
Can the GSTIN checker tell me the business name?
No — it checks the number’s format and check digit only, which catches most typing mistakes. To see the registered name and whether the registration is active, search the GSTIN on the GST portal under Search Taxpayer.
When you outgrow the free tools
Finvosmart puts the right GST on every invoice, keeps your books, and prepares GSTR-1, GSTR-3B and payroll files — free for 7 days.
Start free trial