How to use the GST calculator
- Choose Add GST (to a net price) or Remove GST (from a gross price).
- Enter the amount.
- Pick a GST rate — 5%, 12%, 18%, 28% or type your own.
- See the base amount, GST, CGST/SGST split and total instantly.
How is GST calculated?
To add GST: GST = amount × rate ÷ 100, and total = amount + GST. To remove GST from a gross amount: base = amount ÷ (1 + rate ÷ 100), and GST = amount − base. For intra-state sales the GST is split equally into CGST and SGST.
FAQ
What’s the difference between CGST, SGST and IGST? For sales within a state, GST is split into CGST (central) and SGST (state). For inter-state sales the same total is charged as a single IGST.
Which slab applies to me? Rates depend on the goods or service — common slabs are 5%, 12%, 18% and 28%. Check the HSN/SAC code for your item.
Is anything stored? No — the calculation happens entirely in your browser.