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GST Calculator Online - Instantly Add or Remove GST/VAT

Free GST calculator: add or remove GST, split CGST/SGST/IGST and check 5%, 18% and 40% slabs under GST 2.0. Works as a VAT calculator too.

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About GST/VAT Calculator

The GST Calculator is an essential online tool for businesses and individuals in India and globally, helping to accurately calculate Goods and Services Tax (GST) or Value Added Tax (VAT). Whether you need to determine the final price including tax or remove tax from an inclusive price, this browser-based utility simplifies complex calculations instantly. It supports various GST and VAT rates, making it versatile for different transactions and regions.

This free GST calculator provides a straightforward way to manage your tax calculations without any software installation or sign-up. It's ideal for invoicing, budgeting, and financial planning, ensuring you always have precise figures. Understand how GST impacts your transactions with clear breakdowns, including CGST, SGST, and IGST components.

Key features

  • Add GST/VAT to a base amount
  • Remove GST/VAT from an inclusive amount
  • Supports multiple customizable tax rates
  • Splits GST into CGST and SGST (for India)
  • Calculates IGST for inter-state transactions
  • Browser-based, no installation required
  • Free to use, no signup needed

How to use GST/VAT Calculator

  1. Enter the base amount or inclusive amount.
  2. Select 'Add GST' or 'Remove GST'.
  3. Choose the applicable GST/VAT rate (e.g., 5%, 18%).
  4. View instant results including tax breakdown.
  5. Verify current rates on the official GST portal.

Who is it for?

  • Businesses for invoicing and pricing products
  • Consumers understanding product costs
  • Accountants and tax professionals for quick checks
  • Freelancers for service billing
  • E-commerce sellers for accurate product listings

Frequently asked questions

What is a GST Calculator?

A GST Calculator is an online tool that helps you compute the Goods and Services Tax (GST) or Value Added Tax (VAT) on a given amount. It can either add GST to a base price or extract the GST component from a price that already includes tax.

How do I add GST to an amount using this calculator?

To add GST, enter your base amount (e.g., ₹1,000), select 'Add GST', and choose the GST rate (e.g., 18%). The calculator will show the total amount including GST (e.g., ₹1,180) and the GST amount (₹180).

How do I remove GST from an inclusive amount (reverse GST calculation)?

To remove GST, enter the inclusive amount (e.g., ₹1,180), select 'Remove GST', and choose the GST rate (e.g., 18%). The tool will display the original base amount (₹1,000) and the GST amount (₹180) extracted from it.

What is the GST calculation formula?

To add GST: Amount + (Amount * GST Rate / 100). To remove GST (reverse calculation): Amount / (1 + GST Rate / 100). For example, ₹1,000 + 18% GST = ₹1,000 + (₹1,000 * 18 / 100) = ₹1,180. For ₹1,180 inclusive of 18% GST: ₹1,180 / (1 + 18 / 100) = ₹1,000 base amount.

What are CGST, SGST, and IGST?

In India, GST is split into Central GST (CGST) and State GST (SGST) for intra-state transactions (e.g., 18% GST becomes 9% CGST + 9% SGST). Integrated GST (IGST) is levied on inter-state transactions and imports, encompassing both central and state components.

What are the current GST rates in India?

As of GST 2.0 (effective Sept 22, 2025), primary GST slabs are 5% and 18%, with special rates of 0%, 0.25%, 3%, and 40% for luxury/sin goods. Please note that GST rates are subject to change; always verify the latest rates on the official Indian GST portal.

Is this GST calculator free to use?

Yes, the Doffl GST Calculator is completely free to use, and no signup or installation is required. You can access it directly in your web browser anytime.

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