Our free GST Calculator adds or removes Goods and Services Tax from any amount using standard Indian GST slabs — 5%, 12%, 18%, and 28%. Enter a base price to see GST amount and total, or enter a GST-inclusive price to extract the pre-tax value and tax component instantly.
Built for shop owners, freelancers, e-commerce sellers, and service providers across India who need quick billing calculations without opening a spreadsheet. Supports both exclusive (GST added on top) and inclusive (GST extracted from total) modes, matching how invoices are prepared under CGST + SGST for intra-state or IGST for inter-state transactions.
All calculations run entirely in your browser. Invoice amounts and business figures are never sent to any server, keeping your billing data private. No account required — ideal for quick checks at a shop counter or while preparing GST invoices on mobile.