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GST Calculator – Instant GST Inclusive & Exclusive Calculation

Need to calculate GST quickly and accurately? Our free GST Calculator makes it easy to find GST inclusive and exclusive values for any amount. Whether you’re a business owner, freelancer, or tax expert, this tool helps you stay tax-compliant with ease.

What is GST?

GST (Goods and Services Tax) is a comprehensive, multi-stage, destination-based tax levied on every value addition in India. It replaced multiple indirect taxes like VAT, service tax, and excise duty with a single tax structure.

GST Slabs in India

  • 0% – Basic food items, educational materials
  • 5% – Essential goods
  • 12% – Processed food, garments
  • 18% – Most goods and services
  • 28% – Luxury items and demerit goods

How to Use the GST Calculator

  1. Enter the base amount (or GST-inclusive amount).
  2. Select GST rate (5%, 12%, 18%, or 28%).
  3. Choose whether to calculate GST Inclusive or Exclusive.
  4. Click “Calculate” to get GST amount and final values.

GST Calculation Formulas

1. GST Inclusive Formula:


  Base Price = (GST Inclusive Amount × 100) / (100 + GST Rate)
  GST Amount = GST Inclusive Amount - Base Price

2. GST Exclusive Formula:


  GST Amount = (Base Price × GST Rate) / 100
  Final Price = Base Price + GST Amount

Example 1 (GST Exclusive):

  • Base Price: ₹1,000
  • GST Rate: 18%
  • GST Amount = (1000 × 18) / 100 = ₹180
  • Final Price = ₹1000 + ₹180 = ₹1180

Example 2 (GST Inclusive):

  • Total Price: ₹1180
  • GST Rate: 18%
  • Base Price = (1180 × 100) / 118 = ₹1000
  • GST Amount = ₹180

Benefits of Using Our GST Calculator

  • ✅ 100% Free to Use
  • ✅ Calculate GST in Seconds
  • ✅ Choose from 5%, 12%, 18%, or 28% rates
  • ✅ User-friendly and mobile responsive
  • ✅ Suitable for Indian businesses and freelancers

Who Can Use the GST Calculator?

  • 🧾 Small and medium business owners
  • 📈 Accountants and tax consultants
  • 💼 Freelancers and service providers
  • 🛍️ Retailers and shopkeepers
  • 🏢 Corporates and e-commerce sellers

Common Use Cases

  • Adding GST to invoice amounts
  • Breaking down total amount to find GST share
  • Reverse calculating GST from inclusive price
  • Monthly tax filing and reconciliation

FAQs About GST Calculator

1. What is GST inclusive amount?

It is the total amount after including the GST tax in the base price.

2. What is GST exclusive amount?

This is the base amount before adding GST.

3. Can I select different GST rates?

Yes, you can choose from 5%, 12%, 18%, or 28% as per Indian GST slabs.

4. Is this calculator valid for all Indian states?

Yes, GST is a national tax and applies uniformly across all Indian states.

5. Can I use this for filing returns?

Yes, you can use this calculator to prepare GST values for return filing but always cross-verify with your accounting software.

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