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Calculate GST with CGST/SGST split, inclusive/exclusive & rate comparison.
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GST Calculator is a free, browser-based tool built for one job: calculate gst with cgst/sgst split, inclusive/exclusive & rate comparison. It is part of ToolsMonk's calculators collection, so you can finish the work without downloading software, creating an account, or jumping between multiple websites.
People reach for it most often when they need adding gst to a price when invoicing a customer, working backwards to find the base price and gst inside an inclusive amount, and checking the gst component on a bill or quote. With nothing to install, an unexpected one-off job takes no longer to start than your regular routine.
GST Calculator is designed for people who want a practical, privacy-friendly workflow with instant results inside the larger ToolsMonk library.
| Price | Free, no signup, no paywall, no watermark |
|---|---|
| Works on | Any modern browser: desktop, tablet, and mobile |
| Processing | In your browser, files never leave your device |
| Account required | None |
| Category | Calculators |
Enter the amount and choose the GST rate
Pick whether the amount is GST-exclusive (add GST) or GST-inclusive (remove GST)
See the base amount, GST amount, and total
Adjust to check other rates or amounts
Adds GST to a base amount, or extracts GST from a GST-inclusive price
Supports common GST slab rates
Shows the base amount, GST amount, and total clearly
Handles both 'add GST' and 'remove GST' directions
Runs in your browser, your figures stay on your device
Free, with no signup and no limit on calculations
Adding GST to a price when invoicing a customer
Working backwards to find the base price and GST inside an inclusive amount
Checking the GST component on a bill or quote
Pricing products correctly at a chosen GST rate
GST Calculator exists to make one job effortless: calculate gst with cgst/sgst split, inclusive/exclusive & rate comparison. Professionals, students, and one-time visitors all get the same instant, accurate results in the browser: no installation, no account, no waiting.
Privacy and portability drive the design: all processing runs locally in your browser, so your files and data never leave your device. It behaves identically in every modern browser, from a desktop workstation to a phone.
GST Calculator adds GST to a base price or extracts it from a GST-inclusive amount, showing the base, the tax, and the total separately so your pricing and invoicing are correct.
Adding GST is straightforward, apply the rate and add it on. The part people get wrong is removing it. The GST was added to the smaller base, not the larger total, so to reverse it you divide the inclusive amount by (1 + rate), not subtract the percentage. Subtracting 18% from an inclusive total removes too much; the calculator's 'remove GST' mode uses the correct division.
Choosing the right slab matters too, since rates vary by category of goods and services. The tool lets you pick the applicable rate and then splits the components clearly, which is what you need to itemise tax properly on an invoice.
All calculations run in your browser, so your figures stay private. Pair it with the Loan, EMI, and other ToolsMonk finance calculators for everyday business and personal money maths.
To remove GST, divide the inclusive amount by (1 + rate), never just subtract the percentage
Use the correct slab for your specific goods or services; rates differ by category
Keep the base and GST components separate on invoices for clean accounting
Common questions about this tool, its workflow, and what to expect before you use it.
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Calculate GST with CGST/SGST split, inclusive/exclusive & rate comparison.
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