GST / Tax Calculator
Calculate GST at 5%, 12%, 18%, or 28% with a full CGST/SGST/IGST breakdown.
Enter an amount above to calculate GST at 5%, 12%, 18%, or 28%. See a full breakdown of CGST, SGST, and IGST instantly.
GST Calculator Online — Free Indian Tax Calculator with CGST/SGST/IGST Breakdown
The SmartToolsHub GST Calculator is a free online tool designed to help businesses, freelancers, and individuals calculate Goods and Services Tax (GST) accurately. Whether you're preparing an invoice, verifying a tax breakdown, or planning a budget, our calculator provides instant results with a detailed CGST, SGST, and IGST split.
GST in India is structured across multiple tax slabs — 5%, 12%, 18%, and 28%. Our tool supports all four rates and automatically determines whether to apply a CGST/SGST split (for intra-state transactions) or IGST (for inter-state transactions). Simply enter your base amount, select the GST rate, and choose the transaction type to get a complete breakdown of the tax components and the total payable amount.
Unlike complex accounting software, SmartToolsHub's GST Calculator is designed for speed and simplicity. There is no learning curve, no login required, and no data stored. Every calculation runs in your browser, making it accessible anytime, even on mobile devices. It's the perfect tool for quick tax estimations on the go.
How to Use the GST Calculator
- 1Enter the base amount (the price before tax) into the input field.
- 2Select the applicable GST rate: 5%, 12%, 18%, or 28%.
- 3Choose the transaction type: intra-state (CGST + SGST) or inter-state (IGST).
- 4The calculator will instantly display the tax breakdown and total amount.
- 5Use the results for your invoices, budgeting, or tax planning as needed.
Key Features
- Supports all four Indian GST rates: 5%, 12%, 18%, and 28%
- Automatic CGST/SGST split for intra-state or IGST for inter-state transactions
- Exclusive (add GST) and inclusive (remove GST) calculation modes
- Copy full breakdown to clipboard for use in invoices and reports
Frequently Asked Questions
Our GST Calculator supports all four standard Indian GST rates: 5%, 12%, 18%, and 28%. Simply select the rate that applies to your product or service from the dropdown menu.
CGST (Central GST) and SGST (State GST) are applied to intra-state transactions, where the tax is split equally between the central and state governments. IGST (Integrated GST) is applied to inter-state transactions, where the entire tax goes to the central government.
Yes. The detailed tax breakdown provided by our calculator — including CGST, SGST, and IGST amounts — is suitable for use in invoice preparation. However, always verify with a tax professional for official compliance.
Yes. SmartToolsHub's GST Calculator is fully responsive and works seamlessly on smartphones, tablets, and desktop computers. All calculations happen in your browser, so no internet connection is required after the page loads.