🧮 GST CalculatorGST Tools
About GST Calculator
Simplify your tax calculations and eliminate manual math errors with the Quick Indian GST Calculator, a lightning-fast, browser-based utility designed for Indian business owners, freelancers, accountants, and everyday consumers. Whether you are generating an invoice, pricing a product, or verifying a bill, this tool instantly handles the complexities of Goods and Services Tax (GST) with pinpoint accuracy. Unlike basic calculators, this tool features a smart dual-mode engine. You can seamlessly switch between "Add GST" (calculating the final price from a base exclusive amount) and "Extract GST" (reverse-calculating the base price and tax from a final inclusive amount). It supports all standard Indian GST slabs (0%, 5%, 12%, 18%, 28%) plus a flexible custom percentage option for specialized goods or services. The calculator also intelligently adapts to your transaction type. Select Intra-state to automatically split the tax into CGST and SGST, or Inter-state to apply a unified IGST. The results are presented in a clean, professional breakdown, showing the exact base amount, individual tax components, total GST, and the final gross total. With a convenient "Copy Breakup" feature, you can instantly share a formatted text summary with your clients, vendors, or Chartered Accountant via WhatsApp or email. Best of all, the tool is 100% private and secure. All calculations happen locally in your browser, ensuring your financial data never leaves your device.
How to use GST Calculator
- Select your calculation mode at the top: "➕ Add GST" for exclusive pricing or "➖ Extract GST" for inclusive pricing.
- Enter the monetary amount in the "Base Amount" or "Total Amount" field.
- Choose the applicable GST Rate from the dropdown (0%, 5%, 12%, 18%, 28%), or select "Custom…" to type a specific percentage.
- Select the "Supply Type": choose Intra-state for transactions within the same state (splits tax into CGST + SGST) or Inter-state for transactions across different states (applies IGST).
- Instantly review the large total display and the detailed line-by-line breakdown below it.
- Refer to the "GST Slabs Quick Reference" table at the bottom if you are unsure which rate applies to your product or service.
- Click the "📋 Copy Breakup" button to copy the formatted calculation summary to your clipboard.
- Paste the copied text directly into an invoice, email, or messaging app to share with your CA or client.
Frequently asked questions
Is this GST calculator free and private?
Yes, it is 100% free to use. All calculations are performed locally in your browser, meaning your financial data is never uploaded, tracked, or stored on any external server.
What is the difference between "Add GST" and "Extract GST"?
Add GST is used when you have a base price and need to find the final selling price (Exclusive → Inclusive). Extract GST is used when you have the final billed amount and need to find out how much of it was tax (Inclusive → Exclusive).
What does Intra-state vs. Inter-state mean?
Intra-state means the buyer and seller are in the same state; the GST is split equally into Central GST (CGST) and State GST (SGST). Inter-state means they are in different states; a single Integrated GST (IGST) is applied to the total amount.
Can I calculate GST for a custom percentage?
Absolutely. Simply select "Custom…" from the GST Rate dropdown, and a new input field will appear where you can type any specific percentage (e.g., 1.5% or 7%).
How do I share the calculation with my accountant?
Click the "📋 Copy Breakup" button. This copies a clean, text-based summary of the base amount, tax split, and total, which you can easily paste into WhatsApp, email, or your accounting software.
Are the calculations rounded correctly for official invoices?
The tool displays calculations up to two decimal places, which is the standard for Indian currency (₹). However, for official statutory filing, always round off as per your specific billing software or CA's guidance.
What items fall under the 18% GST slab?
The built-in reference table shows that 18% typically applies to most services, restaurant meals, soaps, cameras, and furniture. Always verify with the latest government notifications for specific HSN codes.