100% free · no signup · runs in your browser

Add or remove GST, in one click.

Enter an amount, pick the GST rate, and see the tax, the CGST/SGST or IGST split and the final price instantly — works for both adding GST to a price and pulling GST out of an inclusive amount.

What do you want to do?

Add GST Remove GST

Amount (excluding GST)

₹

GST rate

0% 5% 18% 40% Custom

Use for special rates such as 3% on gold.

Older invoices (before 22 Sep 2025) used these slabs too:

12% 28%

Type of supply

Within state (CGST + SGST) Interstate (IGST)

Only changes how the tax is split on the invoice — the total GST stays the same.

Total amount (incl. GST)

—

Net price — GST —

Since 22 September 2025 most goods and services fall under 5%, 18% or 40% GST, with 0% for exempt items. Which rate applies to your product or service depends on its HSN/SAC classification, and rates can be revised by the GST Council — confirm with the official GST portal or your CA before filing or invoicing.

Add or remove GST

Start from a pre-tax price or from a GST-inclusive MRP — one switch handles both directions.

Current rate slabs

One-tap 0%, 5%, 18% and 40% chips, a custom rate for special cases, and the older 12% and 28% for past invoices.

CGST, SGST and IGST

Choose within-state or interstate supply and see the tax split exactly the way it appears on an invoice.

Instant, as you type

Net price, GST and total update with every keystroke — no calculate button to press.

Download as PDF

Save a clean one-page summary of the calculation to share with a client or keep for your records.

Private by design

Everything is calculated in your browser. The amounts you enter are never sent anywhere or stored.

GST calculator: know the tax before you bill or buy

Goods and Services Tax (GST) is the indirect tax charged on most goods and services in India. If you run a business, you need to add the right GST to your prices; if you're a buyer holding a GST-inclusive bill, you may want to know how much of it is tax. Our GST calculator does both in a second, and breaks the tax into CGST and SGST or IGST so it matches how an invoice is written.

How GST is calculated

Adding GST
GST amount = Net price × GST rate ÷ 100
Total price = Net price + GST amount

Removing GST
Net price = Total price × 100 ÷ (100 + GST rate)
GST amount = Total price − Net price

For example, adding 18% GST to ₹10,000 gives GST of ₹1,800 and a total of ₹11,800. Going the other way, a bill of ₹11,800 that includes 18% GST has a net price of ₹10,000 — note that you divide by 118, you don't simply subtract 18% from the total.

GST rate slabs in India

Following the GST Council's 2025 rationalisation, which took effect on 22 September 2025, most items now sit in one of three main slabs, plus 0% for exempt goods and services:

Rate	Generally applies to
0%	Exempt and nil-rated items, such as certain essentials.
5%	Essentials and many everyday items, including goods moved down from the older 12% slab.
18%	The standard rate for most goods and services. Items such as air conditioners, TVs and cement moved here from the old 28% slab.
40%	Luxury and "sin" goods, such as tobacco products and caffeinated or carbonated drinks.

The older 12% and 28% slabs were largely removed, though they still appear on invoices raised before the change. A few special rates, such as 3% on gold and silver, are handled through the custom rate box. Always check the rate for your specific item or service.

CGST, SGST and IGST explained

CGST and SGST — when goods or services are supplied within the same state, the GST is split equally between the Centre (CGST) and the State (SGST). At 18%, that's 9% CGST plus 9% SGST.
IGST — when the supply crosses state lines (or is an import or export), the full rate is charged as a single Integrated GST, which is then shared between the Centre and the destination state.

How to use this calculator

Choose Add GST or Remove GST depending on whether your amount is before or after tax.
Enter the amount in rupees.
Pick the GST rate — 0%, 5%, 18%, 40%, or a custom rate.
Select the supply type — within state (CGST + SGST) or interstate (IGST).
Read the result and download the PDF summary if you need it.

Who finds a GST calculator useful

Shop owners and traders

Work out the selling price with GST before writing a bill.

Freelancers and agencies

Add GST to a quote so the client sees the full amount up front.

Accountants

Quickly reverse a GST-inclusive amount to find the taxable value.

Shoppers

See how much of an MRP or bill is actually tax.

Handy tips

If your number already includes GST, use "Remove GST" — adding GST on top of an inclusive price overstates the tax.
Use the correct rate for the exact HSN or SAC code of your product or service, not just a general guess.
Pick "Interstate" when you're billing a customer in a different state — the invoice then shows IGST instead of CGST and SGST.
Rounding can differ slightly between billing software; this calculator rounds each figure to the nearest paisa.

Frequently asked questions

How do I calculate GST on an amount?Multiply the net price by the GST rate and divide by 100 to get the GST amount, then add it to the net price. For ₹5,000 at 18%, GST is ₹900 and the total is ₹5,900.

How do I remove GST from a total price?Divide the GST-inclusive price by (100 + rate) and multiply by 100 to get the net price. For ₹5,900 inclusive of 18% GST, the net price is ₹5,000.

What are the current GST rates in India?From 22 September 2025, the main slabs are 5%, 18% and 40%, along with 0% for exempt items. A few special rates, such as 3% on gold and silver, also exist.

What's the difference between CGST, SGST and IGST?For supplies within a state, the tax is split equally into CGST (Centre) and SGST (State). For interstate supplies, the full amount is charged as IGST.

Why do my numbers differ slightly from my billing software?Different tools round at different steps, such as per item or per invoice. This calculator rounds each figure to two decimal places.

Can I use the old 12% and 28% rates?Yes, they are available under "Older invoices" for working with bills raised before 22 September 2025, but they no longer apply to most new sales.

Is my data stored anywhere?No. All calculations run in your browser and nothing you enter is sent to a server.

This calculator is for general guidance only and is not tax or legal advice. GST rates and rules can change, and the correct rate depends on how your goods or services are classified. Please verify with the official GST portal or a qualified chartered accountant before filing returns or issuing invoices.