Tagline: GST calculator with inclusive, exclusive, reverse & bulk invoice modes GST Calculator is a free tool covering every real-world GST scenario: add GST to a base price, extract it from an inclusive bill, reverse-calculate the original value, or build a multi-item invoice with per-item rates, discounts and shipping. It auto-splits CGST/SGST or IGST by supply type, covers all slabs (0-28%), includes HSN/SAC lookup, and exports as PDF, CSV, or print. Everything runs client-side.