Free GST Calculator Online

Calculating GST manually is confusing and prone to errors. One wrong calculation can mess up your entire invoice. Use our free GST Calculator with custom rate support to get 100% accurate results. Instantly calculate IGST, CGST, and SGST splits for any amount, inclusive or exclusive.

Amount

₹

Calculation

GST Rate

Transaction Type

Total Amount

₹0.00

Net Amount

₹0.00

Total GST

₹0.00

Tax Component	Rate	Amount
CGST	9%	₹0.00
SGST	9%	₹0.00
Total GST	18%	₹0.00

How to use GST Calculator?

Follow these simple steps to calculate your tax liability in seconds.

Enter Amount & Rate

Start by entering the total taxable value of your product or service. Then, select the applicable GST slab (5%, 12%, 18%, 28%) or manually input a custom tax percentage based on your needs.

Choose Tax Calculation

Decide whether the amount you entered is exclusive of tax (Add GST) or inclusive of tax (Reverse GST). Our calculator instantly adjusts the final figures based on this selection.

Select Transaction Type

Specify if the transaction is within the same state (Intra-state) to see CGST & SGST splits, or between different states (Inter-state) to calculate the single IGST component.

Get Detailed Breakdown

Instantly view the complete tax summary, including the Net Amount, Total GST, and Grand Total. Use the results for accurate invoicing and error-free tax filing.

Why Choose Zubizi's Free Online GST Calculator?

Experience the fastest and most accurate way to calculate Goods and Services Tax for your business. Our advanced GST Calculator simplifies complex tax computations, ensuring 100% compliance and error-free invoicing every time.

Custom GST Rates

Not limited to standard slabs. Enter any percentage to calculate compliant invoices for unique goods or services. Flexible for all tax scenarios.

Detailed Tax Breakdown

Automatically splits tax into Central (CGST) and State (SGST) tax for intra-state supply, or Integrated (IGST) tax for inter-state supply.

Reverse GST Support

Easily calculate the original pre-tax value from any GST-inclusive amount. This feature is perfect for traders and businesses who need to back-calculate taxes from total bill amounts quickly and accurately.

100% Private

Your financial data stays completely secure on your device. We do not store or send your data to any server. All calculations are processed locally in your browser for maximum privacy.

Mobile Friendly

Access our tool from anywhere on any device. Whether you are on a smartphone, tablet, or desktop computer, enjoy a fully responsive and seamless experience that lets you calculate on the go.

No Signup Needed

Start using the calculator immediately without any barriers. We don't require you to create an account, provide an email, or log in, ensuring a frictionless and hassle-free experience every time.

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Simplify Your Business Invoicing & Billing Today

Stop relying on manual calculations that can lead to costly errors. Upgrade to Zubizi for a complete, automated billing, inventory, and GST compliance solution that streamlines your entire business operations.

Frequently Asked Questions

Common questions about our GST Calculator.

What is a GST Calculator?

A GST Calculator is an automated tool that helps businesses and individuals instantly compute the Goods and Services Tax payable on any product or service. Zubizi's GST Calculator eliminates manual math by automatically determining the tax amount (IGST, CGST, SGST) and the final invoice value based on the selected tax rate.

How does Zubizi's GST Calculator handle Exclusive and Inclusive taxes?

Our calculator features two distinct modes: 'Normal' for exclusive tax calculations where GST is added on top of the base price, and 'Reverse (GST Inclusive)' which extracts the tax component from a total amount. This ensures you get mathematically precise figures for both billing scenarios.

How do I perform a Reverse GST calculation?

To find the base price from a total amount, simply enter the full value in the 'Amount' field and click the 'Reverse (GST Inclusive)' button. The calculator will immediately show you the original pre-tax cost and the exact GST amount included in that total.

Does this tool calculate IGST, CGST, and SGST separately?

Yes, this calculator includes a specific 'Transaction Type' toggle. When you select 'Same State', it automatically splits the tax into equal CGST and SGST portions. If you select 'Different State', it calculates the single Integrated GST (IGST) component, ensuring your invoice data is compliant with inter-state and intra-state tax rules.

Can I use this calculator for custom tax percentages?

Absolutely. Unlike basic calculators that only offer standard 5%, 12%, 18%, and 28% slabs, Zubizi's tool allows you to input any custom tax rate. This is perfect for calculating special cess rates or taxes for unique goods that fall outside the standard brackets.

Is this calculator suitable for both goods and services?

Yes, this tool is designed to work for both Goods (like electronics or textiles) and Services (like consulting or repairs). The calculation logic remains consistent across both categories, so you can rely on it for generating accurate invoices for any type of business transaction.

How does this tool ensure calculation accuracy and rounding?

Zubizi's GST Calculator uses standard financial rounding logic to process values to two decimal places. This precision ensures that the calculated tax amounts match standard accounting software outputs, making the results ready for direct use in your official invoices and GST filings.