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GST Calculator India: Inclusive & Exclusive, CGST, SGST and IGST

Enter an amount and a GST rate to add GST to a price or take it out of a total, with the CGST, SGST or IGST split shown.

Calculator

Amount is
$

Shown in USD. GST slabs are India's; the percentage maths works in any currency.

GST rate
%
Supply type
More options (extra cess)
%

Optional levy charged on top of GST for some goods. Leave 0 if none.

Total amount$141.60GST $21.60 at 18%
Base price (excl. GST)
$120.00
CGST (9%)
$10.80
SGST/UTGST (9%)
$10.80
Total GST
$21.60
Total payable
$141.60
Tax as a share of the total
15.3%
Same amount at every GST rate
GST rateTotal GSTTotal payable
0%$0.00$120.00
3%$3.60$123.60
5%$6.00$126.00
18%$21.60$141.60
40%$48.00$168.00

Which rate applies depends on the item's HSN or SAC code. Check the official rate list for your product.

Amounts are in USD (United States selected). Change country or currency in the header. Exchange rates are approximate, from a static table updated 2026-10-25 — not live and not for transactions. Indian tax slabs and GST rates are always in INR/India rules; other-currency figures are approximate equivalents.

Estimates for planning only. Not tax or financial advice. Last verified: 2026-10-25

GST calculator India: how it works

Goods and Services Tax is charged as a percentage of the transaction value. You either start from a price before tax and add GST on top, which is the exclusive method, or start from a price that already contains GST and take it out, the inclusive method.

For a sale within one state the tax is split equally between the Centre and the state: CGST and SGST (or UTGST in a Union Territory). For a sale between states, or an import, the whole amount is charged as IGST. This calculator offers the 0%, 3%, 5%, 18% and 40% rates, returns the base price, each tax component and the total, and lets you switch between intra-state and inter-state supply.

Formula and assumptions

Formula

  • Exclusive: GST = amount × rate; total = amount + GST
  • Inclusive: base = amount ÷ (1 + rate); GST = amount − base

Assumptions

  • Rates offered: 0%, 3%, 5%, 18% and 40%. The applicable slab depends on the product/service (HSN/SAC) — confirm on the CBIC notification.
  • Intra-state supply splits GST equally into CGST and SGST/UTGST; inter-state supply is charged as IGST.
  • Cess, TCS/TDS and rounding rules on invoices are not included.

Worked example

₹1,000 at 18% GST

  1. Exclusive: GST = 1,000 × 18% = ₹180; total = ₹1,180. Within one state this is CGST ₹90 + SGST ₹90.
  2. Inclusive: base = 1,180 ÷ 1.18 = ₹1,000; GST = 1,180 − 1,000 = ₹180.
  3. Inter-state: the same ₹180 is charged as IGST.

Result: Base ₹1,000, GST ₹180, total ₹1,180.

Limitations

  • The rate for a product or service depends on its HSN or SAC code. Confirm it on the official CBIC rate notification before issuing an invoice.
  • Compensation cess, TCS/TDS, reverse charge, composition scheme, and invoice rounding rules are not included.
  • Input tax credit is not calculated, so the result shows tax on one transaction, not your net GST liability for the month.
  • Place-of-supply rules decide whether a sale is intra-state or inter-state; for services this is not always the customer's location.

Frequently asked questions

What is the difference between inclusive and exclusive GST?

Exclusive means the price you type excludes GST, so GST is added on top. Inclusive means the price already contains GST, so the tool works backwards to find the base price.

What are CGST, SGST and IGST?

For a sale inside a state, GST is shared as CGST (Centre) and SGST/UTGST (state), each half the rate. For a sale between states, IGST at the full rate is charged.

How do I find the right GST rate?

Look up the HSN code (goods) or SAC code (services) on the CBIC rate schedule or ask your accountant. This tool does not guess the rate from a product name.

What does a 0% rate mean?

Nil-rated and exempt supplies both have no GST to collect, but they are treated differently for input tax credit. This calculator only shows zero tax.

Is GST charged on a discounted price?

GST is charged on the actual transaction value after a discount that is agreed in advance and shown on the invoice. Discounts given later may be treated differently.

Can I use this for my GST return?

No. It helps with quotes and pricing; file returns on the GST portal using your invoice records.

How do I calculate GST from the total amount?

Divide the GST-inclusive total by 1 plus the rate. At 18%, a total of ₹1,180 gives a base price of ₹1,180 ÷ 1.18 = ₹1,000, and the GST is ₹1,180 − ₹1,000 = ₹180. This is the reverse GST calculation; choose the inclusive mode in the calculator and it does the working for you.

What does 1.18 mean in GST calculation?

1.18 is 1 plus the 18% GST rate. Multiply a price before GST by 1.18 to add GST, or divide a GST-inclusive price by 1.18 to take it out. The same idea works for other rates: 1.05 for 5%, 1.03 for 3% and 1.40 for 40%.

Sources

Calculator data last verified: 2026-10-25. Estimates for planning only; not tax or financial advice.

What next?

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