How do I calculate GST on an amount?

GST = amount × rate. At 18%, GST on ₹10,000 is ₹1,800, making the total ₹11,800.

How do I remove GST from a price?

Net amount = inclusive price ÷ (1 + rate). At 18%, ₹11,800 ÷ 1.18 = ₹10,000, so the GST inside it is ₹1,800.

When do I charge CGST + SGST instead of IGST?

Charge CGST + SGST (split equally) when the supplier and the place of supply are in the same state. Charge IGST when they're in different states, and on most imports and exports.

Which GST rate applies to my product or service?

It depends on its HSN (goods) or SAC (services) code. Rates change from time to time, so check the current notification on the GST portal or ask your tax adviser.

GST Calculator · Calculators

GST Calculator (India): Add or Remove GST

Add or remove GST in one click, with CGST, SGST and IGST split out.

100% free
No sign-up
Runs in your browser

Amount & rate

Amount before GST

₹

GST rate

Type of supply

Result

Total GST

₹1,800

@ 18%

Net amount

₹10,000

Excl. GST

Gross amount

₹11,800

Incl. GST

GST breakdown
Net amount	₹10,000
CGST @ 9%	₹900
SGST / UTGST @ 9%	₹900
Gross amount	₹11,800

Adding 18% GST to ₹10,000 gives an invoice total of ₹11,800. For a sale within your state, the tax is split equally between CGST and SGST.

Add GST: GST = amount × rate; gross = amount + GST. Remove GST: net = amount ÷ (1 + rate). Since 22 September 2025 most goods and services fall under 5% or 18%, with 40% for certain luxury and sin goods; 12% and 28% are kept here for older invoices. Always verify the current rate for your HSN/SAC code. Amounts rounded to the paisa. Calculated in your browser; nothing is stored.

How it works

How to use GST Calculator

Choose Add GST (amount excludes tax) or Remove GST (amount already includes tax).

Enter the amount and pick a GST rate, or enter a custom rate.

Choose within-state or inter-state supply to see the CGST + SGST or IGST split.

About

About this tool

Goods and Services Tax (GST) is charged on most supplies in India. This calculator works in both directions: add GST to a net price to get the invoice total, or remove GST from an inclusive price to find the taxable value and the tax inside it.

For a sale within the same state, GST is split equally into Central GST (CGST) and State GST (SGST, or UTGST in union territories). For a sale to another state, the whole amount is Integrated GST (IGST). Switch between the two to get the right breakdown for your invoice, then copy it in one click.

Since the September 2025 rate changes, most goods and services fall under 5% or 18%, with 40% for certain luxury and sin goods, plus special rates such as 3% for gold and 0.25% for rough diamonds. The older 12% and 28% rates are kept for past invoices. Rates depend on the exact HSN or SAC code, so always confirm the current rate on the official GST portal or with your accountant.

Frequently asked questions

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