GST Calculator

Add GST to a price or take it out of a GST-inclusive amount at any rate. See CGST, SGST or IGST, the formula, every slab side by side and what a rate change does to the price.

  • Add or remove GST
  • CGST, SGST, IGST
  • All GST slabs
  • Rate change check
GST rate

Calculated in your browser. Nothing is saved.

Price including GST –

 

Price before GST– 
GST at 18%– 
Price including GST– 
CGST– 
SGST– 

Every GST rate for this amount

Rate change check

See how a GST rate change, such as the September 2025 cuts, changes the price you pay.

How to calculate GST

  1. Choose add or remove“Add GST” when your price excludes GST; “Remove GST” to find the price before GST from an amount that already includes it.
  2. Enter the amount and rateType the amount and pick the GST rate – or enter a custom rate. Choose within the state (CGST + SGST) or between states (IGST).
  3. Read the resultSee the price before GST, the GST, the total, the split and the formula. Compare every rate in the table below.

GST formulas

To findFormulaExample at 18%
GST to addprice × rate ÷ 100₹10,000 × 18 ÷ 100 = ₹1,800
Price including GSTprice × (1 + rate ÷ 100)₹10,000 × 1.18 = ₹11,800
Price before GSTinclusive price ÷ (1 + rate ÷ 100)₹11,800 ÷ 1.18 = ₹10,000
GST inside an inclusive priceinclusive price × rate ÷ (100 + rate)₹11,800 × 18 ÷ 118 = ₹1,800

GST slabs after September 2025

  • 0% (exempt): many fresh foods, education and healthcare services.
  • 5%: most everyday goods and many services.
  • 18%: the standard rate for most other goods and services.
  • 40%: a short list of luxury and sin goods.
  • Special rates: 3% for gold and silver, 0.25% for rough diamonds.

Rates depend on the exact HSN or SAC code of your item – check the latest notification or ask your tax adviser before invoicing.

Frequently asked questions

How do I add GST to a price?

Multiply the price by the GST rate and divide by 100 to get the GST, then add it. For example, 18% GST on ₹10,000 is ₹1,800, so the total is ₹11,800.

How do I remove GST from a price that includes it?

Divide the inclusive price by (1 + rate ÷ 100). For ₹11,800 at 18%, the price before GST is ₹11,800 ÷ 1.18 = ₹10,000 and the GST is ₹1,800. Don’t just take 18% off ₹11,800 – that gives the wrong answer (₹2,124).

What are the current GST rates in India?

Since 22 September 2025 (often called GST 2.0), most goods and services are taxed at 5% or 18%, with 40% for a short list of luxury and sin goods. Some items are exempt (0%), gold and silver are 3% and rough diamonds 0.25%. The older 12% and 28% slabs are kept here for past invoices.

How is GST split into CGST and SGST?

Within a state, the rate is split equally between the Centre (CGST) and the state (SGST) – 18% becomes 9% + 9%. In union territories without a legislature it’s CGST + UTGST. Between states, the whole rate is IGST.

What does a GST rate cut do to the price?

If the price before GST stays the same, an item that cost ₹1,120 at 12% costs ₹1,050 at 5% – about 6.25% cheaper. Use the rate-change check to see the effect on any price.

Can I calculate GST on several items at once?

Yes – use the GST Breakup Calculator to enter a full invoice with different rates, quantities and discounts, and get a rate-wise summary.

Is the GST calculator free?

Yes, completely free with no sign-up. Everything is calculated in your browser and nothing is saved.

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