GST Calculator
Calculate GST instantly for inclusive or exclusive pricing.
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What is GST?
Goods and Services Tax (GST) is an indirect tax levied on the supply of goods and services in India. Introduced in 2017, it replaced multiple indirect taxes such as VAT, service tax, and excise duty with a single unified tax system. GST is charged at different rates depending on the type of product or service, with the most common slabs being 0%, 5%, 12%, 18%, and 28%.
For businesses, correctly calculating GST is essential to ensure accurate invoicing, tax compliance, and financial reporting. Whether you’re creating an invoice, determining the tax component of a product price, or verifying supplier invoices, a GST calculator helps eliminate manual errors and saves time.
GST Calculator Formula
The GST calculation depends on whether the amount entered is exclusive of GST or inclusive of GST.
When GST is Exclusive
GST Amount = Original Amount × (GST Rate ÷ 100)
Final Amount = Original Amount + GST Amount
Example:
If the original amount is ₹10,000 and GST is 18%,
- GST Amount = ₹10,000 × 18% = ₹1,800
- Final Amount = ₹11,800
When GST is Inclusive
Original Amount = Inclusive Amount ÷ (1 + GST Rate ÷ 100)
GST Amount = Inclusive Amount − Original Amount
Example:
If the invoice amount is ₹11,800 (inclusive of 18% GST),
- Original Amount = ₹10,000
- GST Amount = ₹1,800
This calculation is useful when the tax is already included in the selling price and you want to determine the taxable value.
How to Use the GST Calculator
Using the calculator is straightforward:
- Enter the amount.
- Select the applicable GST rate.
- Choose whether the amount is inclusive or exclusive of GST.
- Select the tax structure:
- CGST + SGST for intra-state transactions.
- IGST for inter-state transactions.
- Click Calculate GST to instantly view:
- Original Amount
- GST Amount
- Final Amount
- CGST & SGST or IGST breakup
Understanding CGST, SGST and IGST
Under India’s GST framework, the type of GST charged depends on whether the transaction takes place within the same state or between two different states.
CGST (Central Goods and Services Tax)
CGST is collected by the Central Government on transactions where both the buyer and seller are located in the same state. It represents half of the total GST charged on an intra-state transaction.
For example, if GST applicable on a product is 18%, then 9% is charged as CGST.
SGST (State Goods and Services Tax)
SGST is collected by the respective State Government on the same intra-state transaction. Together, CGST and SGST make up the total GST applicable.
Using the previous example, an 18% GST would be split into:
- CGST = 9%
- SGST = 9%
IGST (Integrated Goods and Services Tax)
IGST is applicable when goods or services are supplied from one state to another. Instead of splitting the tax into CGST and SGST, the entire GST amount is charged as IGST and later distributed between the Central and State Governments.
For example, if a business in Maharashtra sells goods to a customer in Karnataka with an applicable GST rate of 18%, the invoice will include 18% IGST instead of 9% CGST and 9% SGST.
Understanding these tax structures helps businesses create compliant invoices and accurately calculate their tax liabilities.
Common GST Rates in India
| GST Rate | Common Usage |
|---|---|
| 0% | Essential goods and exempt supplies |
| 3% | Precious metals such as gold |
| 5% | Household essentials, transportation services, and select food products |
| 12% | Processed foods, business services, and various manufactured goods |
| 18% | Most products and services, including software, restaurants, and professional services |
| 28% | Luxury goods, premium automobiles, tobacco products, and certain consumer durables |
Frequently Asked Questions
What is a GST Calculator?
A GST Calculator is an online tool that helps calculate the GST amount, taxable value, and final invoice amount for both inclusive and exclusive GST pricing. It eliminates manual calculations and provides accurate results instantly.
How do I calculate GST from an inclusive amount?
Select Inclusive GST, enter the total amount, choose the applicable GST rate, and click Calculate GST. The calculator automatically separates the original taxable amount from the GST component.
How do I calculate GST from an exclusive amount?
Select Exclusive GST, enter the original amount before tax, choose the GST rate, and the calculator will calculate the GST amount and the final invoice value.
What is the difference between Inclusive and Exclusive GST?
With Exclusive GST, tax is added to the base price of the product or service. With Inclusive GST, the displayed price already includes GST, and the calculator extracts the tax amount from the total.
When should I use CGST & SGST instead of IGST?
Use CGST and SGST when the buyer and seller are located in the same state. Use IGST when the transaction takes place between two different states.
Which GST rates are supported by this calculator?
The calculator supports the standard GST slabs used in India, including 0%, 3%, 5%, 12%, 18%, and 28%.
Is this GST Calculator free to use?
Yes. Finifi’s GST Calculator is completely free to use. There are no sign-up requirements, hidden charges, or usage limits, allowing businesses and individuals to calculate GST whenever needed.
Who can use this GST Calculator?
The calculator is useful for business owners, accountants, finance teams, freelancers, students, retailers, wholesalers, and anyone who needs to calculate GST accurately for invoices, quotations, purchases, or sales.