How do I calculate GST on a price?

Multiply the price before tax by the GST rate and divide by 100. For ₹1,000 at 18%, GST is ₹180 and the total is ₹1,180. Within one state that GST is split equally into CGST (₹90) and SGST (₹90); between states it is charged as IGST (₹180).

How do I remove GST from an inclusive price?

Divide the inclusive price by (100 + rate) and multiply by 100 to get the taxable value. For ₹1,180 at 18%: 1,180 × 100 / 118 = ₹1,000, so the GST is ₹180. Subtracting 18% from the inclusive price is a common mistake: it gives ₹967.60, which is wrong.

When do I charge CGST + SGST and when IGST?

It depends on the place of supply. When the supplier and the place of supply are in the same state, you charge CGST and SGST (or UTGST in a union territory without a legislature), each at half the rate. When they are in different states, or for exports and supplies to SEZs, you charge IGST at the full rate.

Which GST rate applies to my product or service?

The rate depends on the item's HSN code (goods) or SAC code (services). The GST Council announced a restructure of rates in 2025, moving most items to two main slabs of 5% and 18% with a higher rate for a small group of goods, so older rate lists may be out of date. Check the current rate schedule on the CBIC website or with your tax adviser before you invoice.

What is GST compensation cess?

Cess is an extra levy that has applied to certain goods on top of GST, charged on the same taxable value. Turn on cess and enter the percentage if it applies to your item. It is shown as a separate line, as it would be on an invoice.

How are the amounts rounded?

Each tax amount is rounded to 2 decimals (paise), and CGST and SGST are always equal halves. In invoice mode the tax is worked out per line and then added up. You can also round the grand total to the nearest rupee; the difference is shown as a round-off line.

Is the printed breakdown a valid tax invoice?

No. It is a calculation summary to help you check figures or share a quote. A GST tax invoice needs details such as your GSTIN, the buyer's GSTIN where applicable, a serial number, HSN or SAC codes and the place of supply. Use your accounting or billing software for invoices.

GST Calculator

Add GST to a price or remove it from an inclusive price, at any rate. See the CGST, SGST or IGST split and cess, or build a multi-item breakdown with rate-wise totals and round-off.

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Runs in your browser

Currency

Number format

Supply

CGST + SGST, each at half the rate.

Add compensation cess

Amount before GST

The net price or taxable value.

GST rate

Net amount

₹1,000.00

GST

₹180.00

Total

₹1,180.00

Breakdown

Taxable value: ₹1,000.00
CGST @ 9%: ₹90.00
SGST @ 9%: ₹90.00
Total: ₹1,180.00

GST rates depend on each item's HSN or SAC code and were restructured by the GST Council in 2025. Check the current rate schedule on the CBIC website before you invoice.

How GST is calculated

GST is charged on the taxable value of a sale. To add it, multiply the price before tax by the rate. To remove it from a price that already includes GST, divide by (100 + rate) and multiply by 100. The two formulas are not mirror images, which is why taking 18% off an inclusive price gives the wrong answer.

GST amount = taxable value × rate / 100
Price with GST = taxable value + GST amount
Taxable value from an inclusive price = inclusive price × 100 / (100 + rate)

CGST, SGST, UTGST and IGST

For a sale within one state, the GST is split equally between the central government (CGST) and the state (SGST). In union territories without a legislature, UTGST replaces SGST. For a sale from one state to another, the full amount is charged as IGST. The rate is the same either way; only the split changes.

Rates change, so check yours

The rate for each product or service comes from its HSN or SAC code. In 2025 the GST Council announced a simpler structure built mainly on 5% and 18%, with a higher rate for a small set of goods, so lists you find online may be out of date. This calculator lets you pick any rate, but it doesn't look up rates for you: confirm the current rate in the CBIC schedule or with your accountant.

How it works

How to use it

Step 1
Choose how to calculate
Add GST to a price before tax, or remove GST from a price that already includes it. Switch to invoice mode for several items.
Step 2
Pick the rate and supply type
Select the GST rate (or type your own), whether the sale is within one state or between states, and add cess if it applies.
Step 3
Copy or print the breakdown
See the taxable value, CGST, SGST or IGST, cess and total, then copy the summary, download a CSV or print a clean breakdown.

FAQs

Frequently asked questions

Answers to common questions about the GST Calculator.

: Multiply the price before tax by the GST rate and divide by 100. For ₹1,000 at 18%, GST is ₹180 and the total is ₹1,180. Within one state that GST is split equally into CGST (₹90) and SGST (₹90); between states it is charged as IGST (₹180).
: Divide the inclusive price by (100 + rate) and multiply by 100 to get the taxable value. For ₹1,180 at 18%: 1,180 × 100 / 118 = ₹1,000, so the GST is ₹180. Subtracting 18% from the inclusive price is a common mistake: it gives ₹967.60, which is wrong.
: It depends on the place of supply. When the supplier and the place of supply are in the same state, you charge CGST and SGST (or UTGST in a union territory without a legislature), each at half the rate. When they are in different states, or for exports and supplies to SEZs, you charge IGST at the full rate.
: The rate depends on the item's HSN code (goods) or SAC code (services). The GST Council announced a restructure of rates in 2025, moving most items to two main slabs of 5% and 18% with a higher rate for a small group of goods, so older rate lists may be out of date. Check the current rate schedule on the CBIC website or with your tax adviser before you invoice.
: Cess is an extra levy that has applied to certain goods on top of GST, charged on the same taxable value. Turn on cess and enter the percentage if it applies to your item. It is shown as a separate line, as it would be on an invoice.
: Each tax amount is rounded to 2 decimals (paise), and CGST and SGST are always equal halves. In invoice mode the tax is worked out per line and then added up. You can also round the grand total to the nearest rupee; the difference is shown as a round-off line.
: No. It is a calculation summary to help you check figures or share a quote. A GST tax invoice needs details such as your GSTIN, the buyer's GSTIN where applicable, a serial number, HSN or SAC codes and the place of supply. Use your accounting or billing software for invoices.

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