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.
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Reverse GST
Enter a GST-inclusive total and extract the base amount and tax breakdown.
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Quotation Calculator
Add line items with qty and rate, pick GST or IGST, and get a full document total.
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Tax Mode Helper
Check whether intrastate (CGST + SGST) or interstate (IGST) applies to your supply.
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Outstanding Calculator
Invoice total minus payments received. See what's still due from your client.
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GSTIN Validator
Validate a 15-character GSTIN format before saving it on a client or invoice.
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Quotation PDF
Fill in client and line-item details, then download a clean quotation PDF. No account needed.
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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.
Frequently asked questions
Are Quotera free tools really free?+
Yes. All calculators and generators on this page work without signup. They are for quick estimates—not tax or legal advice.
Do I need an account to use GST calculators?+
No account needed. For full quotations, invoices, and payment records, apply for Quotera early access.
Can I use these tools for my service business in India?+
Yes. Tools are built for Indian GST contexts—CGST/SGST, IGST, GSTIN format, and quotation totals.
What is the difference between free tools and Quotera?+
Free tools solve one-off calculations. Quotera manages the full workflow: clients, quotations, invoices, branded PDFs, WhatsApp sharing, and payment records.