What is a GST Calculator?
What is GST?
Goods and Services Tax (GST) is an indirect tax levied on the supply of goods and services in India. It replaced multiple taxes such as VAT, Service Tax, Excise Duty, and others with a single unified tax system.
A GST Calculator helps you quickly calculate the GST amount, the total price including GST, or determine the original price before GST was added.
Whether you're a business owner, freelancer, accountant, retailer, or customer, this tool saves time and eliminates manual calculation errors.
How to Use This GST Calculator
Using our GST Calculator is simple and takes only a few seconds.
To Add GST
- Select Add GST.
- Enter the original amount.
- Choose the applicable GST rate (5%, 12%, 18%, 28%, etc.).
The calculator will instantly display:
- GST Amount
- Total Amount Including GST
- CGST Amount
- SGST Amount
To Remove GST
- Select Remove GST.
- Enter the GST-inclusive amount.
- Choose the GST rate.
The calculator will show:
- Original Amount
- GST Amount
- CGST
- SGST
GST Formula
Add GST
GST Amount = Original Amount × GST Rate ÷ 100
Total Amount = Original Amount + GST Amount
Remove GST
Original Amount = GST Inclusive Amount ÷ (1 + GST Rate / 100)
GST Amount = GST Inclusive Amount − Original Amount
Available GST Rates in India
| GST Rate | Common Examples |
|---|---|
| 0% | Essential goods and selected services |
| 5% | Packaged food, transport services |
| 12% | Processed food, computers |
| 18% | Electronics, restaurants, software services |
| 28% | Luxury goods, premium automobiles, tobacco products |
Who Can Use This Tool?
This calculator is useful for:
- 🛒 Shop Owners
- 💼 Business Owners
- 📊 Accountants
- 🧾 GST Practitioners
- 👨💻 Freelancers
- 🏗 Contractors
- 🛍 Retailers
- 👨🎓 Students
- 👥 Consumers
Why Use Our GST Calculator?
- ✅ 100% Free
- ✅ Instant Results
- ✅ Accurate Calculations
- ✅ Add or Remove GST
- ✅ Mobile Friendly
- ✅ No Registration Required
- ✅ Easy to Use
- ✅ Works on All Devices
Frequently Asked Questions
What is GST?
GST (Goods and Services Tax) is a unified indirect tax applied to the supply of goods and services in India.
Is this GST Calculator free?
Yes. Our GST Calculator is completely free to use without any registration or subscription.
Can I calculate GST backwards?
Yes. Select Remove GST to calculate the original amount before GST was added.
Which GST rates are supported?
This calculator supports all standard GST rates including 0%, 5%, 12%, 18%, and 28%.
Does this calculator show CGST and SGST?
Yes. For domestic transactions, the GST amount can be split equally into CGST and SGST.
Can I use this calculator on mobile?
Yes. The GST Calculator is fully responsive and works on smartphones, tablets, laptops, and desktop computers.
Why Choose Postmelon GST Calculator?
The Postmelon GST Calculator is designed to provide fast, accurate, and hassle-free GST calculations for businesses and individuals. Whether you're creating invoices, preparing quotations, checking purchase costs, or verifying tax amounts, our calculator helps you calculate GST in seconds with complete accuracy.