Free GST Calculator
Calculate GST instantly with CGST, SGST, and IGST breakup. Perfect for businesses, invoices, and billing in India.
Advanced: Add Profit Margin
If filled, 'Initial Amount' is treated as Cost Price.
Common Categories
Calculation Summary
India's Smartest Online GST Calculator
Calculating GST shouldn't be a hassle. Whether you are generating an invoice, checking a bill, or calculating profit margins, our free online GST calculator gives you instant, accurate results with full CGST, SGST, and IGST breakdowns.
How to calculate GST?
The formula for calculating GST is simple, but depends on whether the amount is exclusive or inclusive of GST.
1. Add GST (Exclusive)
Use this when you have the base price and need to add GST to get the final selling price.
GST Amount = (Base Price × Rate) / 100
Total = Base Price + GST Amount2. Remove GST (Inclusive)
Use this when you have the final MRP and want to find the original base price and the tax component.
Base Price = Total / (1 + (Rate/100))
GST Amount = Total - Base PriceUnderstanding CGST, SGST, and IGST
India's GST system is a dual-tax model. Depending on where the buyer and seller are located, different taxes apply:
- Intra-State (Same State): When the buyer and seller are in the same state. The GST is split equally into CGST (Central GST) and SGST (State GST). Example: 18% GST becomes 9% CGST + 9% SGST.
- Inter-State (Different States): When the buyer and seller are in different states. The entire tax is collected as IGST (Integrated GST).
Current GST Slab Rates in India (2026)
| GST Rate | Common Items / Services |
|---|---|
| 0% (Nil) | Fresh fruits/vegetables, milk, eggs, bread, salt, printed books. |
| 5% | Packaged food items, footwear (below ₹1000), apparel (below ₹1000), transport services. |
| 12% | Computers, processed food, apparel (above ₹1000), business class air tickets. |
| 18% | IT services, SaaS, telecom, financial services, branded garments, most electronics. (Standard Rate) |
| 28% | Automobiles, luxury items, aerated drinks, tobacco, cement. |
Why choose VyaparGateway GST Calculator?
- 100% Free & No Ads: Use all features without any cost or annoying ads.
- Secure & Private: No data selling. We do not store your financial data on our servers.
- Precise Split: Automatic calculation of CGST, SGST, and IGST based on supply type.
- Fastest Results: Get instant results as you type. No page reloads or "Calculate" buttons needed.
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Start 7-Day Free TrialStandard GST slabs in India
The four standard rates as per the 2026 GST framework. Not sure which slab your product falls under? Cross-check with the official HSN code on the GST portal.
Essential goods, processed food, packaged services
Standard items — business class travel, butter, cheese
Most goods and services — software, restaurants, telecom
Luxury items, ACs, automobiles, sin goods
What this calculator does
Not just a tax adder. A full GST workflow for billing, invoicing, and quick quote sharing.
Add or remove GST
Inclusive (reverse GST) and exclusive (add GST) modes — switch with one tap.
Auto CGST + SGST + IGST split
Intra-state? Splits 50/50 between CGST and SGST. Inter-state? Falls back to IGST.
Profit margin built-in
Add your cost price and see net margin alongside tax — invoice-ready in one view.
Share & copy
One-tap WhatsApp share or copy summary to clipboard for chats, emails, invoices.
Why merchants pick this calculator
Most "free" GST tools track every keystroke, push popups, or upsell PDF generators. We just calculate.
Runs in your browser
Every calculation is local — no servers, no logging, no third parties touching your numbers.
No sign-up
Calculate, copy, leave. No account, no email, no friction.
No ads
We earn from our paid gateway — never by renting your attention to ad networks.
GST-rate aware
All four standard slabs (5/12/18/28%) plus custom — accurate for the 2026 GST framework.
Frequently asked questions
Common GST questions, matched to structured data for rich-result eligibility.
- How to calculate GST?
- To add GST: Multiply the base amount by the GST rate and divide by 100. Then add this GST amount to the base amount. To remove GST (inclusive): Divide the total amount by (1 + (Rate/100)) to get the base amount, then subtract the base amount from the total to get the GST amount.
- What is the difference between CGST, SGST, and IGST?
- CGST (Central GST) and SGST (State GST) are applied on intra-state sales (within the same state). The total GST is split equally between them. IGST (Integrated GST) is applied on inter-state sales (between different states) and goes entirely to the Central Government.
- How much is GST on ₹1000 at 18%?
- If ₹1000 is exclusive of GST, the 18% GST is ₹180, making the total ₹1180. If ₹1000 is inclusive of 18% GST, the base amount is ₹847.46 and the GST amount is ₹152.54.
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