GST Calculator Online: How to Calculate GST Amount (Inclusive & Exclusive)

Online GST Calculator: Calculate GST Inclusive and Exclusive Amount Easily


Managing tax calculations is an essential part of running any business or handling personal finances in India. Goods and Services Tax (GST) is an indirect tax applied on the supply of goods and services across the nation. To simplify these tax computations, our Free Online GST Calculator helps shopkeepers, accountants, business owners, and consumers calculate exact tax amounts in seconds without manual errors.

What is GST (Goods and Services Tax)?

GST is a comprehensive, multi-stage, destination-based tax levied on every value addition. India operates under a multi-tier GST rate structure, primarily categorized into 5%, 12%, 18%, and 28% slabs based on the nature of goods or services.

Types of GST Calculations

When computing taxes for billing or accounting, you generally need two types of calculations:

  • GST Inclusive Amount: When the total price of a product already includes the tax amount.
  • GST Exclusive Amount: When the tax needs to be added on top of the base cost price of the item.

Mathematical Formula Used for GST Calculations

If you wish to calculate tax manually, here are the official mathematical formulas:

1. Formula for GST Inclusive Calculation:

GST Amount = Gross Amount - [Gross Amount x {100 / (100 + GST Rate)}]

Net Price = Gross Amount - GST Amount

2. Formula for GST Exclusive Calculation:

GST Amount = (Base Price x GST Rate) / 100

Total Price = Base Price + GST Amount

How to Use Our GST Calculator Tool?

  1. Enter the initial cost or invoice amount in the Amount input box.
  2. Select the relevant GST tax slab percentage (5%, 12%, 18%, or 28%).
  3. Choose whether the price is Inclusive or Exclusive of tax.
  4. Click on the Calculate button to get instant results showing the net amount, calculated tax, and final total.

Save your valuable time and avoid calculation mistakes by utilizing our free digital utility tools directly on our homepage!