GST Calculator
Free GST calculator to add or remove GST. Get the base amount, GST and total with CGST, SGST and IGST split for any rate (5%, 12%, 18%, 28% or custom).
🔒 Calculated in your browser. CGST + SGST applies to sales within a state; IGST applies to inter-state sales — the total tax is the same either way.
Free GST Calculator
This free online GST calculator adds or removes Goods and Services Tax in seconds. Enter an amount, choose a GST rate (3%, 5%, 12%, 18% or 28%, or a custom rate), and instantly see the base amount, GST amount and total — with the CGST, SGST and IGST split. It’s free, accurate and runs entirely in your browser.
How to use the GST calculator
- Choose Add GST (to add tax to a price) or Remove GST (to find the base price inside a GST-inclusive amount).
- Enter the amount.
- Pick the GST rate, or type a custom percentage.
- See the base, GST and total instantly, plus the CGST/SGST and IGST breakdown.
How GST is calculated in India
To add GST, the tax is the amount multiplied by the rate: GST = amount × rate ÷ 100, and the total is amount + GST. To remove GST from a tax-inclusive price, the base is found by base = amount × 100 ÷ (100 + rate), and the GST is the difference. For a sale within the same state, the GST is split equally into CGST (central) and SGST (state); for an inter-state sale, the full amount is charged as IGST. Either way, the total tax you pay is the same.
GST in India has slabs of 0%, 5%, 12%, 18% and 28% (plus special rates like 3% for gold). Most services fall under 18%. This calculator lets you check any rate so your invoices and quotes are always correct.