DollarWise

Free GST Calculator — Add or Remove GST (India CGST/SGST/IGST)

November 3, 2026 · 3 min read · By the DollarWise team

How it works

Enter an amount, pick the GST slab and whether you want to add GST to a base price or remove GST from a GST-inclusive total — this calculator splits the tax into CGST + SGST for intra-state supplies or IGST for inter-state supplies, and shows the exact base, tax and final amount.

GST Calculator (India)

Add or remove GST — CGST / SGST / IGST split in one click.

100% Free Forever No Sign-up No Credit Card Private — runs in your browser Unlimited Use

1 Amount and GST slab

2 Calculation mode and supply type

Use "Add" when you have a pre-GST price; use "Remove" when you have a GST-inclusive total and want the base amount.
Same state = CGST + SGST (half each). Different state = IGST (full).

3 See the GST breakdown

🧾 Your GST breakdown

🎉 Free forever. No sign-up. No credit card. No limits.

Run as many GST scenarios as you like — every calculation happens in your browser.

## How the math works GST is a percentage of the base (pre-tax) amount. When you **add** GST: tax = base × rate ÷ 100 and gross = base + tax. When you **remove** GST from a gross total: base = gross ÷ (1 + rate ÷ 100) and tax = gross − base. For an **intra-state** supply (seller and buyer in the same state) the total GST is split equally into CGST (central) and SGST (state), each at half the rate. For an **inter-state** supply the full amount is charged as IGST. ## Everyday uses - **Invoice pricing:** add GST to your base selling price so you issue correct GST-compliant invoices. - **Purchase reconciliation:** remove GST from a bill total to find the actual pre-tax cost and claim accurate input tax credit. - **E-commerce checkout check:** verify that a platform's "GST included" price splits correctly into CGST/SGST or IGST. ## Frequently asked questions ### Which GST slab applies to my product or service? The four standard slabs are 5%, 12%, 18% and 28%, plus a 0% rate for essential items and special rates for gold, jewellery and some goods. The exact slab depends on the HSN/SAC code — check the latest CBIC GST rate schedule for your category. ### What is the difference between CGST, SGST and IGST? CGST and SGST are levied together on intra-state (same-state) transactions, each at half the total rate. IGST is levied alone on inter-state (different-state) transactions at the full rate. The total tax collected is the same either way; only which government receives it differs. ### Can I use this for composition scheme dealers? No. Composition dealers pay a flat turnover-based tax (e.g. 1% for traders, 5% for restaurants) and cannot charge GST separately or claim input tax credit. This calculator assumes a normal (regular) GST registration.