GST Calculator
Add GST to a base amount or reverse-calculate GST from an inclusive total for invoices and procurement checks.
No loginBrowser-side processingNo server uploads
Interactive Presets
India GST
UK/EU VAT
Global GST
Intra-State GST Breakdown (CGST & SGST 50/50 split)
Base amount
1000.00
Tax amount (18%)
180.00
Invoice Grand Total
1180.00
Business examples
- Add 18% GST to a vendor quote
- Remove GST from a gross invoice amount
- Check base cost before procurement approval
How to use it
- Enter the base amount or gross amount.
- Set the GST rate used for your transaction.
- Choose whether to add GST or remove GST from an inclusive amount.
FAQ
Can I use 5%, 12%, 18%, or 28% GST?
Yes. The rate field accepts any percentage.
Does this store calculation data?
Processing happens in your browser. FreeBizTools does not upload your files or form contents to a server in this launch version.
Does this replace tax advice?
No. It is a calculator for business checks; verify compliance with your accountant or local tax rules.