About GST Calculator India
Use our GST Calculator to compute tax on any taxable value under India's Goods and Services Tax (GST). Whether you need to add GST to a base price or extract GST from an MRP-inclusive bill, this tool gives base amount, GST amount, and total in seconds—with automatic CGST + SGST split for intra-state sales and IGST guidance for inter-state supply.
Calculation Formula
Use these standard formulas for accurate estimates:
Add GST (Exclusive → Inclusive)
Total = Base + GST Amount
Remove GST (Inclusive → Exclusive)
GST Amount = Inclusive − Base
Intra-state split
IGST = Full GST Amount (inter-state only)
Example Calculation
Example: ₹10,000 at 18% GST (Add mode)
| Component | Value |
|---|---|
| Base amount (excl. GST) | ₹10,000.00 |
| GST @ 18% | ₹1,800.00 |
| CGST @ 9% | ₹900.00 |
| SGST @ 9% | ₹900.00 |
| Total (incl. GST) | ₹11,800.00 |
Benefits of Using This Calculator
Instant, accurate GST math aligned with Indian tax formulas
Automatic CGST, SGST, and IGST split for compliance-ready figures
Supports all major GST slabs plus custom rate entry
Mobile-friendly layout—calculate on phone or desktop
No data stored—calculations run locally in your browser
Free forever—ideal for SMEs, freelancers, and accountants
Frequently Asked Questions
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Common GST rates are 0%, 5%, 12%, 18%, and 28%. Certain goods like gold attract 3%, and some items have cess. Rates are notified by the GST Council and may change.
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For intra-state sales, GST is split equally into CGST (Central) and SGST (State). For inter-state sales, IGST is charged by the Centre and later apportioned.
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Yes. Investro GST calculators are 100% free, require no signup, and run in your browser for instant results.
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Results are estimates based on standard formulas. For statutory filings, consult a tax professional and refer to the latest GST notifications.
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Conclusion
Accurate GST calculation helps you invoice correctly, claim ITC, and stay compliant. Bookmark this GST Calculator for daily billing—or explore our specialized tools for inclusive pricing, reverse calculation, ITC, and industry-specific GST on gold and cars.