Free Online GST Calculator
Calculate Goods and Services Tax instantly with full CGST and SGST breakdowns. 100% private and secure local processing.
Step-by-Step Usage Guide
Compute tax breakdowns and net/gross pricing in three straightforward steps:
Enter the numerical price value in the Initial Amount input field.
Choose the applicable GST rate (5%, 12%, 18%, or 28%) and calculation type.
Click “Calculate GST” to output balanced Central (CGST) and State (SGST) figures.
Understanding GST Calculation Modes
Financial billing handles tax formatting based on whether pricing is quoted as exclusive or inclusive:
- Add GST (Exclusive): The initial amount is treated as base cost, stacking the tax percentage on top.
- Remove GST (Inclusive): Calculates reverse fractional math to extract embedded tax from the gross price.
Mathematical Formula Reference
The calculation engine runs standard commercial accounting rules:
- Adding GST: Total Tax = (Base Price × GST Rate) / 100
- Removing GST: Base Price = Gross Price / (1 + (GST Rate / 100))
- Split Rule: Central (CGST) and State (SGST) each receive equal 50% shares.
Practical GST Computation Examples (18% Slab)
| Calculation Mode | Input Figure | Base Price | Total Tax | Final Gross |
|---|---|---|---|---|
| Add GST (Exclusive) | ₹1,000.00 | ₹1,000.00 | ₹180.00 (₹90 + ₹90) | ₹1,180.00 |
| Remove GST (Inclusive) | ₹1,180.00 | ₹1,000.00 | ₹180.00 (₹90 + ₹90) | ₹1,180.00 |
| Add GST (Exclusive) | ₹5,000.00 | ₹5,000.00 | ₹900.00 (₹450 + ₹450) | ₹5,900.00 |
Frequently Asked Questions
How does this tool process financial data privately?
All calculations execute locally via your browser’s JavaScript runtime engine. No financial values, line entries, or invoice figures are ever transmitted across networks or stored on external servers.
What is the difference between CGST and SGST?
For intrastate transactions within India, the total GST is split equally: 50% goes to the Central Government (Central Goods and Services Tax) and 50% goes to the State Government (State Goods and Services Tax).
Can I calculate custom tax rates?
The tool provides the four standard statutory GST slabs (5%, 12%, 18%, and 28%) covering the vast majority of consumer goods, commercial invoices, and digital services.