GST Calculator – Calculate GST Amount Online Free

What is GST Exclusive and GST Inclusive?

This is one of the most important things to understand before you calculate GST online.

GST Exclusive

GST Exclusive means the price you have does not include GST. The GST amount will be added on top of it.

GST Inclusive

GST Inclusive means the price you have already includes GST. You want to find out how much of that total is the GST portion.

Our GST calculator inclusive and exclusive modes handle both cases. Simply select the right option and our GST and tax calculator will do the rest.

SGST, CGST & IGST – Types of GST in India

Not many people know this—when you pay 18% GST on something, that money does not go to just one place. It gets split between the central and state governments. This is how India's GST system works, and there are four types you should be aware of.

CGST (Central GST)

CGST is the central government's share of the tax. It applies whenever a product or service is sold within the same state.

SGST (State GST)

SGST is the state government's share on that same transaction. It is always equal to CGST — so on an 18% GST bill, both CGST and SGST take 9% each.

IGST (Integrated GST)

IGST comes into the picture when goods or services cross state borders. Instead of splitting the tax, the full amount goes to the central government first — and is later shared with the buying state.

UTGST (Union Territory GST)

UTGST is similar to SGST but applies in union territories like Chandigarh, Ladakh, and Dadra & Nagar Haveli. Wherever SGST would normally apply, UTGST takes its place in these regions.

Our GST SGST CGST calculator shows you the exact tax split on any amount. Use our GST calculator SGST CGST tool to quickly find out how much goes as CGST and how much as SGST — great for invoicing and GST return filing.

How to Use This GST Calculator Online?

Our GST calculate online tool is very simple. Just follow these 4 easy steps:

Step 1: Select GST Exclusive or GST Inclusive

Choose GST Exclusive if your amount does not include GST. Choose GST Inclusive if your amount already includes GST and you want to find the GST component.

Step 2: Enter the Total Amount

Enter the price or amount for which you want to calculate GST amount. For example, ₹10,000.

Step 3: Enter the Tax Slab (GST %)

Enter the applicable GST rate — 5%, 12%, 18%, or 28%. For most services and common products, it is 18%.

Step 4: Click Calculate to Get GST Amount Instantly

Click the Calculate button. Our GST calculator tool will instantly show you the Total GST amount and the Total Amount with GST.

GST Amount Calculation Formula Explained

Here are the exact formulas used in our GST tax calculator:

How to Calculate GST Exclusive Amount

When your price does not include GST:

GST Amount = Original Amount × (GST% ÷ 100)
Total Amount with GST = Original Amount + GST Amount

Example:
Amount = ₹10,000 | GST = 18%
GST Amount = 10,000 × 18 ÷ 100 = ₹1,800
Total Amount with GST = 10,000 + 1,800 = ₹11,800

How to Calculate GST Inclusive Amount

When your price already includes GST and you want to find the GST portion:

GST Amount = Original Amount − (Original Amount × 100 ÷ (100 + GST%))
Pre-GST Amount = Original Amount − GST Amount

Example:
Total Amount = ₹11,800 | GST = 18%
Pre-GST Amount = 11,800 × 100 ÷ 118 = ₹10,000
GST Amount = 11,800 − 10,000 = ₹1,800

How to Calculate GST from Total

To calculate GST from total (inclusive price), always use the inclusive formula above. Many people make the mistake of directly applying the GST percentage to the total price — that gives the wrong answer. Our calculate GST calculator handles this correctly every time.

GST Rates in India – 5%, 12%, 18% and 28%

Here is a quick overview of GST slabs in India:

5% GST

Essential food items, medicines, small restaurants

12% GST

Processed food, business class hotels, mobile phones

18% GST

Most services, electronics, software, restaurants

28% GST

Luxury goods, automobiles, tobacco, aerated drinks

Our 18 percent GST calculator and 18 GST calculator are the most commonly used modes — as 18% is the standard GST rate for most services and products in India.

Why Use Our Free GST Calculator Tool?

There are many reasons to use our GST calculator online free:

Key Benefits

• Supports both GST Exclusive and GST Inclusive calculations

• Works for all GST slabs — 5%, 12%, 18%, and 28%

• Gives instant results — no manual math needed

• Completely free — no login, no charges

• Simple design that anyone can use

• Accurate results every time — perfect for businesses, accountants, and individuals

Whether you call it a GST cal, a GST ca, or a goods and service tax calculator — our tool gives you the right answer every single time.

FAQ

What is the difference between GST Exclusive and GST Inclusive?

GST Exclusive means GST is not included in the given price. GST will be added to arrive at the final amount. GST Inclusive means the given price already has GST built into it. Use our GST calculator inclusive mode to extract the GST from a total price.

How to calculate 18% GST on an amount?

To calculate 18% GST on an amount, multiply the amount by 0.18. For example, 18% GST on ₹10,000 = ₹1,800. Total with GST = ₹11,800. Use our GST 18 calculator to do this instantly without any manual calculation.

How to calculate GST from a total (inclusive) price?

To calculate GST from a total inclusive price, use this formula:
GST Amount = Total − (Total × 100 ÷ (100 + GST%))
Or simply use our calculate GST inclusive mode — enter the total amount and GST rate, and the tool will show you the exact GST portion automatically.

Is this GST calculator free to use?

Yes! Our GST calculator online free tool is completely free. There is no registration, no subscription, and no hidden charges. You can use it as many times as you want — directly in your browser.