GST Calculator
Calculate GST amount with CGST, SGST, and IGST breakdown for any rate (5%, 12%, 18%, 28%). Add or remove GST from any price. Free, instant, no signup required.
What is GST Calculator?
The GST (Goods & Services Tax) Calculator helps you compute the exact GST amount and total price for any product or service in India. It supports all four slab rates and shows the CGST/SGST/IGST breakdown for invoicing.
Are the interest rates updated?
We regularly update rates and tax slabs. However, always verify current rates with your bank or the official government portal before making decisions.
Is my financial data safe?
Absolutely. All calculations happen locally in your browser. No data is sent to any server. Your financial information never leaves your device.
How to Calculate GST
- Enter the net price (amount before GST)
- Select the applicable GST rate (5%, 12%, 18%, or 28%)
- Click Calculate to see GST amount, CGST, SGST, IGST, and total price
How GST Calculator is Calculated
GST Amount = Net Price × GST Rate / 100. For GST-inclusive prices: Net Price = GST-inclusive Price × 100 / (100 + GST Rate). CGST and SGST are each half of the total GST for intra-state transactions.
Worked Example
For a product worth ₹1,000 at 18% GST: GST Amount = ₹180 (CGST ₹90 + SGST ₹90 for intra-state). Total price = ₹1,180. For inter-state: IGST = ₹180.
Common Use Cases
- Invoice generation for businesses
- Price calculation with GST
- GST return filing preparation
- Reverse GST calculation from inclusive price
Common Mistakes to Avoid
- Applying the wrong GST slab — always verify the HSN/SAC code for your product or service to confirm the applicable rate.
- Confusing inclusive and exclusive GST pricing — MRP is typically GST-inclusive, while B2B invoices often quote exclusive prices.
- Mixing up CGST/SGST (intra-state) with IGST (inter-state) — using the wrong type can cause ITC mismatch issues.
- Forgetting GST on reverse charge items like legal or transport services where the buyer pays GST.
Frequently Asked Questions
What are the GST slab rates in India?
India has 4 main GST slabs: 5% (essential goods), 12% (standard goods), 18% (most services & goods), and 28% (luxury goods). Some items are exempt (0%).
What is the difference between CGST, SGST, and IGST?
CGST goes to the Central Government, SGST to the State Government — both apply on intra-state sales. IGST applies on inter-state sales and goes to the Centre.
How do I calculate GST inclusive price?
GST inclusive price = Net price × (1 + GST rate/100). For ₹1,000 at 18%: total = ₹1,000 × 1.18 = ₹1,180. The reverse calculator extracts GST from an inclusive price.
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Why This Tool Is Essential
GST, implemented on July 1, 2017, replaced 17 indirect taxes. With over 1.4 crore registered businesses and monthly collections exceeding ₹1.5 lakh crore, GST impacts virtually every transaction in India. The four-slab structure (5%, 12%, 18%, 28%) applies differently to goods and services, making accurate calculation essential for compliance.
Key Features
- Calculate GST at any rate (5%, 12%, 18%, 28%, or custom)
- Automatic CGST + SGST split for intra-state transactions
- IGST mode for inter-state calculations
- Reverse GST calculation from inclusive amount
- Supports both goods and services
- No login or signup required
Formula & Methodology
GST Amount = Base Price × (GST Rate / 100). For inclusive: Base Price = Total / (1 + GST Rate/100). CGST = SGST = GST / 2 (intra-state). IGST = full GST (inter-state).
Step-by-Step Example
Product price ₹10,000, GST rate 18%: GST = 10,000 × 0.18 = ₹1,800. CGST = ₹900, SGST = ₹900. Total = ₹11,800. Reverse: If inclusive price is ₹11,800 at 18%, base = 11,800 / 1.18 = ₹10,000.
Reference Table
GST slabs with calculation examples
| Slab | Common Items | On ₹10,000 | Total |
|---|---|---|---|
| 5% | Packaged food, economy hotels | ₹500 | ₹10,500 |
| 12% | Butter, mobile phones | ₹1,200 | ₹11,200 |
| 18% | Most services, electronics | ₹1,800 | ₹11,800 |
| 28% | Luxury cars, tobacco | ₹2,800 | ₹12,800 |
Tips for Better Results
- 💡 Verify applicable GST rate — the schedule is updated quarterly by the GST Council.
- 💡 Ensure GSTIN is valid before claiming Input Tax Credit.
- 💡 For e-commerce sellers, TCS of 1% is deducted by the platform.
- 💡 Keep purchase invoices for at least 6 years for ITC claims and audits.
- 💡 Use HSN/SAC codes for correct rate classification.
Ideal Users
Small business owners, chartered accountants, consumers verifying charges, freelancers, and e-commerce sellers.
📚 Complete Guide Available
Want to learn more? Read our comprehensive guide with detailed explanations, real-world examples, expert analysis, and actionable tips.
Read: GST Calculator: CGST, SGST & IGST Explained 2026Disclaimer: This calculator provides estimates for informational purposes only. Actual outcomes may vary based on applicable rates, policies, and individual circumstances. Consult a qualified financial advisor or chartered accountant before making financial decisions. See our full Disclaimer.
Methodology: Formula based on standard financial calculation methods widely used in the banking industry. See our Editorial Policy for how we validate calculators.
Maintained by: Sagar Sahni, Calc Labz | Review: formula checks, worked examples, and periodic updates
Need a correction? Contact us with the calculator name, your inputs, and the issue you found.
Last updated: April 2026