GST Calculator
Enter Amount (₹)
₹
Calculation Mode
Price does not include GST
Transaction Type
CGST + SGST applies
GST Rate
Bulk GST Calculator
Add multiple line items and get a combined GST summary.
Item Name
Amount (₹)
GST Rate
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How GST Works
Add GST (Exclusive)
Your base price does not include GST. The calculator adds GST on top to arrive at the final invoice amount.
Total = Base × (1 + Rate/100)
Remove GST (Inclusive)
Your price already includes GST. The calculator extracts the base amount and tax component from the total.
Base = Total ÷ (1 + Rate/100)
Intra-state (CGST + SGST)
When buyer and seller are in the same state. GST is split equally between CGST (Central) and SGST (State).
Inter-state (IGST)
When buyer and seller are in different states. Full GST goes as IGST (Integrated GST) to the Central government.
GST Rate Reference
| GST Rate | CGST | SGST | IGST | Common Items |
|---|---|---|---|---|
| 0% | 0% | 0% | 0% | Fresh vegetables, milk, eggs, education, healthcare |
| 5% | 2.5% | 2.5% | 5% | Packaged food, edible oil, sugar, tea, coal |
| 12% | 6% | 6% | 12% | Mobile phones, computers, processed food, bicycles |
| 18% | 9% | 9% | 18% | Electronics, AC, software, restaurant services, hotel |
| 28% | 14% | 14% | 28% | Luxury cars, tobacco, aerated drinks, casino services |
Frequently Asked Questions
What is the difference between CGST, SGST and IGST? ▼
CGST (Central GST) and SGST (State GST) are levied together on intra-state (within same state) transactions — each at half the applicable GST rate. IGST (Integrated GST) is levied on inter-state (different state) transactions at the full GST rate.
How do I calculate GST on a price that already includes GST? ▼
Select “Remove GST” mode, enter the inclusive amount and choose the rate. The calculator extracts the original base price using: Base = Total ÷ (1 + Rate/100). The difference is your GST component.
Who needs to register for GST? ▼
Businesses with annual turnover above ₹20 lakhs (₹10 lakhs for special category states) must register for GST. E-commerce operators and inter-state suppliers must register regardless of turnover.
Can I use this calculator for invoice preparation? ▼
Yes — this calculator gives you the exact CGST, SGST and IGST breakdowns needed for GST invoices. For automatic invoice generation and GST filing, try LekhaBooks, our free accounting software.
What are the GST filing due dates? ▼
GSTR-1 (outward supplies): 11th of the following month. GSTR-3B (monthly return): 20th of the following month. Quarterly filers have different deadlines. LekhaBooks sends automatic reminders for all GST due dates.
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