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Free Online GST Calculator

Quickly compute Goods and Services Tax for commercial invoicing or personal shopping. Toggle between adding GST or extracting tax from gross amounts.

Total Amount (with GST)

$0.00

Total Tax: $0.00 (18% GST)

Base Amount ($)

GST Tax Rate 18%

Custom Tax Rate %:

Net / Base Price: $0.00

Total GST Tax Amount: $0.00

CGST (Central Tax 9%): $0.00

SGST (State Tax 9%): $0.00

IGST (Inter-State Tax 18%): $0.00

Final Gross Amount: $0.00

Intra-state (CGST + SGST) or Inter-state (IGST)

How to Use This Tool

How to Use This Tool – GST Calculator

Enter Base or Total Amount

Provide the transaction amount in your local currency.

Select GST Tax Slab

Choose standard tax rates (3%, 5%, 12%, 18%, 28%) or enter a custom rate.

Toggle Inclusive or Exclusive

Switch between adding GST to a net price or removing GST from a gross total.

Key Features & Capabilities

Key Features & Capabilities – GST Calculator

Exclusive & Inclusive Modes

Calculate added tax on net prices or reverse-calculate base prices from gross figures.

Intra-State Tax Split

Automatically splits total GST into Central GST (CGST) and State GST (SGST) components.

Inter-State IGST Support

One-click toggle for Integrated GST on inter-state commercial transactions.

Preset & Custom Rates

Quick-access buttons for standard government slabs plus custom rate inputs.

Copyable Invoice Summary

Copy itemized breakdown lines directly into spreadsheets, accounting software, or invoices.

Browser-Based Calculation

All accounting calculations execute locally on your machine with total data privacy.

FAQ

Frequently Asked Questions

What is the difference between GST inclusive and exclusive?

GST Exclusive means the price does not include tax; tax is added on top. GST Inclusive means the displayed price already includes the tax amount.

How is CGST and SGST divided?

For intra-state transactions, the total GST rate is divided equally (50% each) between CGST (Central Government) and SGST (State Government).

What is IGST and when does it apply?

Integrated GST (IGST) applies to inter-state transactions where goods or services are supplied from one state to another, collected entirely as one rate.

How do you calculate reverse GST (extracting tax)?

To extract GST from an inclusive price: GST Amount = Total Price - [Total Price / (1 + (GST Rate / 100))].

Can I use custom tax rates for international VAT?

Yes! While standard slabs match Indian GST, the custom rate input works perfectly for VAT, sales tax, or consumption taxes worldwide.

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