Online GST Calculator – Calculate GST Instantly in India

Use this free online GST calculator to quickly calculate Goods and Services Tax (GST) for any transaction in India. The tool helps you add or remove GST, view tax breakup, and get accurate results based on official GST slabs. It is designed for businesses, freelancers, accountants, students, and anyone dealing with GST-applicable prices.

GST Calculator Tool

Use the calculator above to:

• Add GST to a base amount

• Remove GST from an inclusive price

• View CGST and SGST breakup for intra-state transactions

• Calculate IGST for inter-state supplies

• Choose from standard GST rates (0%, 5%, 12%, 18%, 28%)

The calculator works instantly and does not require login or personal details.

About This GST Calculator

This GST calculation tool is built specifically for Indian tax requirements. It follows the standard GST formulas used for inclusive and exclusive pricing and supports reverse GST calculation. The results are suitable for billing estimates, purchase calculations, and learning purposes.

Last Updated: July 2025
Reviewed by: Finance & Tax Research Team

What Is GST and How Is It Calculated?

GST (Goods and Services Tax) is an indirect tax applied to the supply of goods and services in India. It replaced multiple central and state taxes and is charged as a percentage of the transaction value based on the applicable GST slab.

GST can be calculated in two main ways:

• Adding GST to a base price to get the final amount

• Removing GST from an inclusive price to find the original value

For intra-state transactions, GST is divided equally into CGST and SGST. For inter-state transactions, IGST is charged instead.

GST Calculation Methods Supported

Add GST to a Base Amount

If you know the original price before tax, the tool calculates the GST amount and adds it to give you the final payable value.

Remove GST From an Inclusive Amount

If the price already includes GST, the calculator helps you find the base amount and the tax portion separately.

Reverse GST Calculation

This method identifies how much GST is embedded in a total price and shows the exact tax breakup.

GST Slabs Covered

The calculator supports all official GST rates used in India:

• 0% – Essential goods

• 5% – Basic food items and transport services

• 12% – Processed goods and selected products

• 18% – Most services and standard goods

• 28% – Luxury and high-value items

You can select the applicable rate directly from the calculator.

GST Calculation Example

If the base price of a product is ₹1,000 and GST is charged at 18%, the GST amount will be ₹180, making the total payable amount ₹1,180.

If ₹1,180 is the inclusive price, removing GST will show ₹1,000 as the base amount and ₹180 as the tax component.

Who Can Use This Tool?

This GST calculation tool is useful for:

• Small business owners and shopkeepers

• Freelancers and service providers

• Chartered accountants and tax consultants

• Online sellers and resellers

• Students learning GST concepts

• Anyone dealing with taxable transactions

Use GST Calculation Anywhere

The calculator works smoothly on mobile, tablet, and desktop devices. It runs entirely in your browser and does not store any data, making it fast, lightweight, and private.

Frequently Asked Questions

What is GST in India?

GST is a unified indirect tax introduced in India on 1 July 2017 to replace multiple central and state taxes.

Can I calculate GST for inclusive and exclusive prices?

Yes, the tool supports both inclusive and exclusive GST calculations.

Does this calculator support IGST?

Yes, IGST can be calculated for inter-state transactions.

Is this GST calculator free to use?

Yes, the tool is completely free and does not require registration.

Is the calculation accurate?

The calculator uses standard GST formulas and provides accurate results for general calculation purposes.

Important Disclaimer

This GST calculator is provided for informational and estimation purposes only. For official tax filing, invoicing, or compliance matters, consult a qualified tax professional or refer to official GST guidelines.