GST Calculator
Clear numbers. Simple maths.
Understand the GST in your price. Add tax to a base amount or separate it from an inclusive total—with a clear breakdown in seconds.
Base amount₹10,000
GST at 18%*₹1,800
Total₹11,800
*Illustrative rate only.Let’s calculate your GST
Choose how your price is entered, then add the amount and GST rate.
Your GST breakdown
A simple view of your base amount, tax and total.
Total amount including GST
Values are rounded to two decimal places for display. Cess and other charges are not included.
How to use the GST calculator
Whether you are checking a quote or understanding a tax-inclusive price, start with the amount you know.
Choose your calculation
Choose “Add GST” if tax is extra, or “Extract GST” if your price already includes it.
Enter amount and rate
Enter your price in rupees and the applicable GST percentage. You can edit both fields.
Review the breakdown
Press Calculate GST to see the base amount, GST amount and total inclusive price.
Understand it with an example
For a base amount of ₹10,000 at an illustrative 18% GST, the tax is ₹1,800 and the total is ₹11,800. If ₹11,800 already includes GST at the same rate, extracting it gives the same ₹10,000 base and ₹1,800 tax.
Frequently asked questions
What is the difference between inclusive and exclusive GST?
An exclusive amount is the price before GST is added. An inclusive amount already contains GST. Choose the matching option to avoid adding tax twice.
How does this calculator work?
To add GST: GST amount = base amount × rate ÷ 100. To extract GST: base amount = inclusive total ÷ (1 + rate ÷ 100). GST is the difference between the inclusive total and the base amount.
Does the calculator choose the GST rate for me?
No. It calculates using the rate you enter. Confirm the applicable rate for your goods or services before using the result. The default percentage is only an example.
Does this include cess or create a tax invoice?
No. This tool calculates the base amount, GST and inclusive total. It does not include cess or other charges, create an invoice, or file a GST return.
Do I need to enter my phone number?
No. This calculator requires only an amount and GST rate. The calculation runs in your browser without sending those values to a calculation service.