View calculation formula
GST Amount = Base Price × Rate / 100
Total = Base Price + GST Amount
Example: ₹10,000 × 18% = ₹1,800 GST → Total ₹11,800
How to Use This Calculator
Simple 3-step process
Enter Amount
Input the base price you want to calculate GST for
Select Rate
Choose GST rate: 5%, 12%, 18%, or 28%
Get Results
View GST amount and total price instantly
Quick GST Rate Guide
Find the right rate for your calculation
Fresh vegetables, milk, salt, newspapers, unbranded flour
Packaged food, clothing (<₹1000), footwear (<₹500), tea, coffee
Butter, cheese, mobiles, processed food, business class air travel
Most electronic goods, restaurant services, telecom, IT services, monitors
Automobiles, luxury items, tobacco, aerated drinks, ACs, 5-star hotels
Gold (3%), Rough Diamonds (0.25%), Semi-precious stones
*Note: Rates are updated periodically by the GST Council. Check official notifications for legal compliance.
GST Formula Explained
See how the calculation works
Example: You buy goods worth ₹10,000 with 18% GST
GST = Base Price × Rate ÷ 100Real World Examples
See how it works in daily life
Freelancer Bill
Amit provides web design services for ₹20,000.
Mobile Phone
Buying a new smartphone worth ₹15,000.
AC Purchase
Buying an Air Conditioner for ₹40,000.
Don’t make this common mistake!
Never calculate GST on top of MRP (Maximum Retail Price). MRP is already “Inclusive of all taxes”. Calculating GST on MRP means you are paying tax twice! Use our
Reverse GST Calculator
for MRP calculations.
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Frequently Asked Questions
Everything you need to know about GST calculation
How do I calculate GST from base price?
To calculate GST from base price, multiply the base amount by the GST rate and divide by 100. For example, if your base price is ₹10,000 and GST rate is 18%, the GST amount is ₹10,000 × 18 / 100 = ₹1,800. The total price including GST would be ₹11,800.
What are the GST rates in India?
India has four main GST rate slabs: 5% for essential items like packaged food and economy hotels, 12% for standard goods like processed foods and business class air tickets, 18% for most goods and services including restaurants and telecom, and 28% for luxury items like automobiles and tobacco products.
Is this GST calculator free to use?
Yes, our GST calculator is completely free with no hidden charges, no subscription fees, and no login required. You can use it unlimited times for all your GST calculations.
What is the difference between GST inclusive and exclusive?
GST exclusive means the price does not include GST – you need to add GST to get the final price. GST inclusive means the price already includes GST – you need to extract the GST component. This calculator works with GST exclusive prices (base prices).
How accurate is this GST calculator?
Our calculator uses the standard GST formula (Amount × Rate / 100) which provides 100% accurate results. The calculations follow the official GST rates prescribed by the Government of India.