GST Calculator
Free GST calculator for India — add or remove GST at any rate (5%, 12%, 18%, 28%) with automatic CGST/SGST or IGST split. Instant, accurate, private.
Base amount
₹1,000.00
GST (18%)
₹180.00
CGST (9%)
₹90.00
SGST (9%)
₹90.00
Need a full GST invoice with this? Use the Invoice Generator — it auto-applies CGST/SGST or IGST and adds a UPI QR.
About GST Calculator
Calculate GST in seconds. Add GST to a base amount, or extract GST from a GST-inclusive amount (reverse GST), at any standard rate (0.25%, 3%, 5%, 12%, 18%, 28%). See the base, the GST, the CGST/SGST split for same-state sales (or IGST for inter-state), and the total. Perfect for invoicing, pricing, and quick checks. Everything is calculated in your browser.
Your privacy is built in
Everything in GST Calculator runs locally in your browser — your data never leaves your device and is never uploaded to a server, so nothing you enter is stored or seen by anyone else. No account, no sign-up, no watermark, and completely free.