Free GST Calculator - Add & Remove GST

Why Every Business Needs a Reliable GST Calculator

Whether you are a freelancer sending an invoice to a new client, a small business owner pricing your inventory, or just a consumer trying to figure out the real cost of a product, dealing with taxes can be a massive headache. India's Goods and Services Tax (GST) system involves multiple tax slabs, and manually calculating them every single time is a quick way to make accounting errors.

I built this free online GST calculator to completely automate that process. You don't need to memorize complex formulas or pull out your phone calculator. Just enter your base amount, pick the tax slab, and our tool does the heavy lifting instantly.

Adding GST vs. Removing GST (Reverse Calculation)

One of the most useful features of this tool is the ability to do both forward and reverse tax calculations:

• Add GST (Exclusive): Use this when you know the base price of your service or product and need to figure out how much tax to add on top. For example, if you charge ₹10,000 for web design, adding 18% GST will show your client a final bill of ₹11,800.
• Remove GST (Inclusive): Use this when you have the final, total price (MRP) and need to figure out exactly how much of that money is tax, and how much is the actual product value. The tool automatically reverses the formula to give you the exact pre-tax net amount.

Understanding CGST, SGST, and IGST

When you calculate GST, you'll notice our tool breaks the tax down into two halves. Here is a quick, plain-English breakdown of what those mean:

If you are selling a product to a customer within your own state (Intra-state), the government splits the total tax equally between the Central Government (CGST) and your State Government (SGST). For example, an 18% tax gets split into 9% CGST and 9% SGST. However, if you are selling to a customer in a completely different state (Inter-state), the entire tax goes under a single bracket called Integrated GST (IGST).