Free GST & billing tools
Calculators and generators for Indian businesses — no signup required. Use instantly, free forever.
GST Calculator
Add GST to any amount. See CGST, SGST or IGST split instantly for common tax rates.
Open tool
Reverse GST
Enter a GST-inclusive total and extract the base amount and tax breakdown.
Open tool
Quotation Calculator
Add line items with qty and rate, pick GST or IGST, and get a full document total.
Open tool
Tax Mode Helper
Check whether intrastate (CGST + SGST) or interstate (IGST) applies to your supply.
Open tool
Outstanding Calculator
Invoice total minus payments received — see what's still due from your client.
Open tool
GSTIN Validator
Validate a 15-character GSTIN format before saving it on a client or invoice.
Open tool
Quotation PDF
Fill in client and line-item details, then download a clean quotation PDF — no account needed.
Open tool
These tools are for quick estimates only. They are not tax or legal advice. Always verify with your CA for compliance.
Ready to manage quotations and invoices?
Quotera helps you create branded GST documents, track payments, and share PDFs on WhatsApp — all in one place.