Why I built this
Every GST calculator I found online does one thing: base price → GST amount. Real invoicing isn't that simple — you need to go the other direction (extract GST from an inclusive price), reverse-calculate from a final figure, or build a multi-line invoice with different rates per item. So I built GST Calculator for ForgePlug to cover all of it.
What it does
- Exclusive mode — add GST on top of a base amount (₹10,000 × 18% = ₹1,800 GST, ₹11,800 total)
- Inclusive mode — extract the GST baked into a final bill using price × rate ÷ (100 + rate)
- Reverse mode — recover the original taxable value from just the selling price
- Bulk mode — multi-line invoices with per-item GST rates, discounts, and shipping
- Automatic CGST/SGST split for intra-state supplies, full IGST for inter-state
- All slabs covered: 0%, 3%, 5%, 12%, 18%, 28%, plus custom rates
- HSN/SAC lookup — search by code or keyword, apply the indicative rate directly
- Multi-currency support (INR, USD, EUR, GBP, AED)
- Export as PDF, CSV, or print an invoice-style statement
- Donut-chart visualization and plain-language "smart insights" on the tax breakdown
Who it's for
Freelancers quoting a GST-inclusive price who need the taxable value for their books, shop owners building a quick multi-item bill with a shipping charge, or anyone checking whether an invoice they received was taxed correctly.
Details
All calculations run client-side — your financial numbers are never uploaded or stored. Free, no signup.
Try it: https://www.forgeplug.com/tools/gst-calculator
Would love feedback, especially from anyone doing GST invoicing regularly — what's missing?
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