GST Calculator
Struggling with GST math? Our free GST calculator makes it easy! Just enter the amount, choose the GST rate (5%, 12%, 18%, or 28%), and get instant results, whether you need to add or remove GST. Ideal for businesses, freelancers, and shoppers. No errors, just quick and accurate tax calculations!
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What is a GST Calculator?
The GST Calculator is a simple tool to quickly determine the GST amount on a product or service. It will let you calculate prices excluding GST and including GST based on the GST rate, with this GST concept being common in India, Australia, and other countries where GST is applicable.
About GST
The government and many eminent economists have described the Goods and Services Tax as the biggest tax reform in the country. Goods and Services Tax is an indirect tax, and under it, a uniform tax is imposed on all goods and services. Before the GST bill was passed, 30 to 35% tax had to be paid on any item, and the tax imposed directly or indirectly on some goods was more than 50%, but after the arrival of GST, it became the same everywhere, i.e., about 28%. Now the question arises, what is the full name of GST? Friends, the full name of GST is Goods and Services Tax. GST is an indirect tax, in which the tax-paying persons get many facilities. Let us know further, with the implementation of the GST bill, market taxes like service tax, entertainment tax, etc., have all been included in GST.
How to Use a GST Calculator
Input the Product/Service Amount
Typically, entering the initial product or service cost or value is a good place to start.
It could be GST exclusive (amount before GST), or GST inclusive ( inclusive of GST).
Select GST Rate
Select the GST rate applicable to your region. For example:
In India, the GST rates are 5%, 12%, 18%, and 28%.
In Australia, the standard rate of GST is 10%.
For most calculators, there is a dropdown or input field where you can choose or enter the appropriate rate.
Now select the Calculation Type (Add or Remove GST)
Most calculators have two modes:
Add GST: When you have the base price, it calculates the total price inclusive of GST.
Remove GST: If you already have a GST-inclusive price, extract the GST component.
View the Results
The calculator will display:
GST Amount: The selected rate GST component.
Total Amount: If you choose to add GST, the total price includes GST.
Base Amount: The GST-free amount if you have decided to remove GST.
You can also calculate for different amounts or rates (Optional).
If you don't want to recalculate for a different amount, just change the value and see if the result changes.
GST Calculation examples
Goods and Services Tax (GST) is calculated using simple formulas based on whether the amount is GST-inclusive or GST-exclusive. Below are the key formulas and practical examples.
1. GST Calculation Formulas
A. Calculating GST on a GST-Exclusive Amount (Adding GST)
| GST Amount = Original Price × ( | | ) |
Total Price (GST-Inclusive)=Original Price+GST Amount
B. Calculating GST on a GST-Inclusive Amount (Removing GST)
| GST Amount = | | GST-Inclusive Price × GST Rate | | | 100 + GST Rate |
|
Original Price (GST-Exclusive) = GST-Inclusive Price - GST Amount
2. GST Calculation ExamplesExample 1: Adding GST (GST-Exclusive to GST-Inclusive)
Original Price (GST-Exclusive): ₹1,000
GST Rate: 18%
Calculations:
| GST Amount = 1000 × ( | | ) = ₹180 |
Total Price (GST-Inclusive) = 1000 + 180 = ₹1,180
Result:
GST Added: ₹180
Final Price: ₹1,180
Example 2: Removing GST (GST-Inclusive to GST-Exclusive)
Total Price (GST-Inclusive): ₹2,360
GST Rate: 18%
Calculations:
Original Price (GST-Exclusive) = 2360 - 360 = ₹2,000
Result:
GST Removed: ₹360
Base Price: ₹2,000
Deducting GST from the gross amount.
| Gross amount | 20% GST | 10% GST |
| 1000 | 833.33 | 909.09 |
| 500 | 416.67 | 454.55 |
| 200 | 166.67 | 181.82 |
Inclusive GST on the gross amount.
In this context, the gross amount is the base amount (not including taxes), and then GST is added to get the total final amount owed. Most business-to-business invoices, quotes, etc., utilise this method, with the tax line shown separately from the total amount owed.
To determine how much GST has been charged based on your base value:
GST Amount = Base Value × (GST Percentage % / 100)
Final Amount Due (With GST Inclusive) = Base Value + GST Amount
Or: Base Value × (1 + GST Percentage %)
Here is a more natural, step-by-step breakdown of these examples. I've added a bit of context to help explain why the numbers are split the way they are in the Indian tax system.
Understanding GST: Real-World Examples
When you see a price tag in India, there is usually a bit of math happening behind the scenes. Whether you are a business owner or just checking your receipt, it helps to know how the Goods and Services Tax (GST) actually adds up.
1. The Standard Wholesale Deal (12% GST)
Imagine a wholesaler is selling a batch of goods. The actual value of the products (the "base price") is ₹10,000. Since these items fall under the 12% tax slab, here is how the final bill is created:
Base Price: ₹10,000
Tax Calculation: 10,000 × 12% = 1,200
The Total: You add the tax to the base price, making the final payable amount ₹11,200.
2. The Luxury Purchase (28% GST)
Higher-end items, like an Air Conditioner (AC), sit in the highest tax bracket because they are considered luxury goods. Let's look at how that impacts the cost of a ₹50,000 AC:
Base Price: ₹50,000
Tax Calculation: 50,000 × 28% = ₹14,000
The Total: Once the tax is added, the buyer ends up paying ₹64,000.
A Quick Note on the "Hidden" Math: That ₹14,000 in tax is a big jump! It's why luxury items often feel much more expensive once you reach the checkout counter.
How is the tax actually split?
In India, the way the tax is collected depends on where the goods are going. It doesn't change the total you pay, but it changes who gets the money:
Buying within your own state (Intra-state): The GST is split 50/50. Using the AC example above, the ₹14,000 tax would be divided into ₹7,000 for the Central Government (CGST) and ₹7,000 for your State Government (SGST).
Buying from another state (Inter-state): The entire amount is categorized as IGST (Integrated GST). In the AC example, the full ₹14,000 goes under the IGST heading on your invoice.
A simple table showing the different GST slabs (5%, 12%, 18%, and 28%) and which common items fall into each one.
| Slab | What's Included? (Examples) | The Vibe |
|---|
| 0% (Nil) | Fresh milk, eggs, unbranded grains/flour, fresh veggies, health/life insurance premiums, and school notebooks. | Essentials: Things you need to survive and learn. |
| 5% | Packaged foods (paneer, biscuits, namkeen), hair oil, shampoo, toothpaste, and budget hotels (under ₹7,500). | Daily Use: Common items found in every Indian household. |
| 18% | Electronics (TVs, ACs, Fridges), small cars (<1200cc), smartphones, and restaurant bills. | Standard: The "everything else" category for modern living. |
| 40% | Luxury cars, high-end bikes (>350cc), tobacco, and aerated/sugary sodas. | Sin & Luxury: Non-essentials or items with a health/social cost. |
