How to calculate GST at 18%?

To calculate 18% GST, multiply the amount by 0.18. For example, if the price is 1000, GST = 1000 * 0.18 = 180.

What is the difference between GST Inclusive and Exclusive?

GST Exclusive means tax is added on top of the product price. GST Inclusive means the tax is already included in the final price.

GST Calculator Online

Calculate GST amounts accurately for Indian Tax Slabs (2025).

Amount (₹)

GST Rate (%)

Net Amount

₹ 0

GST Amount ₹ 0

Total Gross Amount

₹ 0

What is Goods and Services Tax (GST)?

The Goods and Services Tax (GST) is a value-added tax levied on most goods and services sold for domestic consumption. In India, GST is a comprehensive, multi-stage, destination-based tax that has replaced many indirect taxes. Whether you are a business owner generating invoices or a consumer checking a bill, knowing the exact tax amount is crucial.

How to Use This Calculator?

Select Mode: Choose 'Exclusive' if the tax needs to be added, or 'Inclusive' if the tax is already part of the price.
Enter Amount: Input the net price of the goods or service.
Select GST Rate: Click on the applicable slab (3%, 5%, 12%, 18%, or 28%).
Calculate: Click the button to see the Net Amount, Tax Amount, and Total.

GST Calculation Formulas

1. GST Exclusive Formula

GST Amount = (Original Cost × GST Rate) / 100
Net Price = Original Cost + GST Amount

2. GST Inclusive Formula

GST Amount = Original Cost - [Original Cost / (1 + (GST Rate / 100))]

Real-World Example

Imagine you are buying a smartphone worth ₹10,000 and the GST rate is 18%.

Exclusive Case: You need to pay ₹10,000 + 18% tax. The tax is ₹1,800. Total bill = ₹11,800.
Inclusive Case: You paid ₹10,000 total. This means the phone's actual price was approx ₹8,474 and you paid ₹1,525 as tax.

Frequently Asked Questions (FAQs)

What are the current GST slabs in India?

The primary slabs are 0% (exempt goods), 5% (essentials), 12% (standard), 18% (services/standard), and 28% (luxury goods).

Why is this tool useful for businesses?

Businesses often need to perform reverse calculations (Inclusive GST) to find the actual base price of a product for accounting purposes. This tool automates that complex math.