GST Calculator
Enter an amount to see the calculation
Free GST Calculator Online (Inclusive & Exclusive)
Calculating the Goods and Services Tax (GST) shouldn't require complex spreadsheets. Whether you are a business owner invoicing a client, or a consumer trying to figure out the exact base price of an item you purchased, our real-time GST Calculator handles both standard and custom tax slabs instantly.
How to Use the Calculator
- Choose Calculation Mode:
- Add GST (Exclusive): Use this if you have a base price and need to add the tax on top of it to find the final billing amount.
- Remove GST (Inclusive): Use this if you have the final receipt total and need to calculate "backward" to find out how much tax was included and what the original base price was.
- Enter the Amount: Type in your total value.
- Select the GST Rate: Choose from standard tax slabs (3%, 5%, 12%, 18%, 28%) or select "Custom Rate" to type in a specific regional percentage.
- View Detailed Results: The calculator instantly outputs the Net Price, Gross Price, and the exact Total GST Amount. It even splits the tax evenly into CGST (Central Tax) and SGST (State Tax) for your accounting ledgers!
The Mathematical GST Formulas
If you want to understand the math running behind the tool, here are the universally accepted accounting formulas for calculating tax margins:
- To Add GST:
GST Amount = (Original Cost × GST Rate) / 100 - To Remove GST (Reverse Calculate):
Base Price = (Total Amount × 100) / (100 + GST Rate)
Accounting Disclaimer: This calculator provides exact mathematical representations of tax percentages. However, depending on your specific country or local jurisdiction (such as India, Australia, or Canada), certain goods and services may be exempt, zero-rated, or subject to additional cess and surcharges. Always verify final figures with a licensed Chartered Accountant (CA) or certified tax professional before filing official government returns.