Free GST Calculator Online — CGST SGST IGST Breakdown (2026)
Key Takeaways
Calculate GST (CGST, SGST, IGST) instantly with our free online calculator. Enter amount + GST rate to get complete breakdown. Supports reverse GST calculation and composition scheme comparison. No signup needed.
Quick Answer
Calculate GST instantly:
- Go to tohundguide.com/tools/gst-calculator
- Enter your amount and GST rate
- Get instant CGST, SGST, and IGST breakdown
Free. No signup. Works for all GST rates (5%, 12%, 18%, 28%).
What Does Our GST Calculator Do?
Our All-in-One GST Calculator is the most comprehensive free GST tool available online. It includes:
1. Regular GST Calculation
Enter any amount and select the GST rate (5%, 12%, 18%, or 28%). Instantly see:
- Tax-exclusive price (amount before GST)
- CGST amount (Central GST)
- SGST amount (State GST) — for intra-state transactions
- IGST amount (Integrated GST) — for inter-state transactions
- Total amount (including GST)
2. Reverse GST Calculation
Already have the total amount including GST? Use reverse calculation to find:
- The original amount before GST
- The GST component within the total
- Split into CGST + SGST or IGST
3. Composition Scheme Comparison
Compare regular GST with composition scheme:
- See the effective tax rate under composition
- Compare compliance requirements
- Decide which scheme is better for your business
4. HSN / SAC Code Lookup
Don't know the GST rate? Our calculator includes a built-in HSN/SAC code finder:
- Search by product or service description
- Get the correct GST rate instantly
- See chapter-wise HSN codes
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GST Rates in India (2026)
| Rate | Common Items |
|---|---|
| 0% | Essential food items, education, healthcare |
| 5% | Packaged food, transport, shoes below ₹1000 |
| 12% | Processing food, computers, smartphones |
| 18% | Most services, electronics, IT services |
| 28% | Luxury items, cars, tobacco, aerated drinks |
Who Uses This Calculator?
- Business Owners — Calculate GST on invoices and quotations
- Accountants & CAs — Quick GST computation during filing
- E-commerce Sellers — Determine selling price with GST
- Freelancers — Add GST to service invoices
- Students — Learn GST calculation for exams
When to Use CGST + SGST vs IGST?
| Transaction Type | Tax Applied |
|---|---|
| Intra-state (within same state) | CGST + SGST (equal split) |
| Inter-state (different states) | IGST (full amount) |
| Import/Export | IGST |
Our calculator automatically handles this — just select the transaction type!
Frequently Asked Questions
How do I calculate GST on a product?
Use our free GST calculator: Enter the base price + select the GST rate (5%, 12%, 18%, or 28%). The calculator instantly shows CGST, SGST, and IGST breakdown with the total payable amount.
What is reverse GST calculation?
Reverse GST calculation lets you extract the original price from a GST-inclusive amount. For example, if you paid ₹1,180 at 18% GST, the original price was ₹1,000 and GST was ₹180.
Is GST same across all states in India?
Yes, GST rates are uniform across all states. The only difference is how it's split: within the same state, it's CGST + SGST (going to central + state government). Between states, it's IGST (going to the central government, then distributed).
Can I use this calculator for GST filing?
This calculator is for quick computation. For actual GST return filing (GSTR-1, GSTR-3B), you'll need to use the GST Portal or accounting software. However, our calculator is great for verifying amounts before filing.
Try It Now
No signup. No login. Instant results.
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Frequently Asked Questions
How do I calculate GST online for free?
Visit tohundguide.com/tools/gst-calculator, enter your amount and select the GST rate. You'll instantly see CGST, SGST, and IGST breakdown with the total amount. Free, no signup needed.
What is reverse GST calculation?
Reverse GST calculation extracts the original price from a GST-inclusive amount. Enter the total amount with GST, select the rate, and our calculator shows the base price and GST component separately.
What's the difference between CGST, SGST, and IGST?
CGST (Central GST) and SGST (State GST) apply to intra-state sales (within the same state). IGST (Integrated GST) applies to inter-state sales. The total rate remains the same — only the split differs.
Is this GST calculator accurate for 2026?
Yes, our calculator uses the latest GST rates as per the 2026 GST rate schedule. It supports all standard rates: 0%, 5%, 12%, 18%, and 28%.
Disclaimer
This article is for educational purposes only and does not constitute professional legal, tax, or financial advice. The information provided is based on public sources and may change over time. We are not responsible for any actions taken based on this content. Please consult a qualified professional for specific advice related to your situation.
GST rates verified against GST Council notifications. Last updated March 2026.