GST Calculator - Free Online Tool

Calculate Indian GST (Goods and Services Tax) from a pre-GST amount. Enter the amount exclusive of GST and choose the applicable rate (5%, 12%, 18%, or 28%). The tool shows the net amount (same as your input), the GST amount in ₹, and the gross amount (total including GST). All amounts are shown in Indian Rupees (₹) with standard formatting. Useful for invoices, quotes, and compliance in India.

GST Calculator

Amount (exclusive of GST)

Enter pre-GST amount in ₹

GST rate (%)

How to Use This Tool

Enter the amount that is exclusive of GST (pre-GST or net amount) in the first field. Use numbers only; the tool displays results in ₹.
Select the GST rate that applies: 5%, 12%, 18%, or 28%.
Read the results: Net (pre-GST), GST amount, and Gross (amount including GST).
Change the amount or rate to recalculate.

Benefits of Using This Tool

Quick GST calculation for common Indian tax rates without a spreadsheet.
Clear breakdown of net, GST, and gross in ₹.
Runs in the browser; no signup or installation.

When to Use GST Calculator

Adding GST to a quoted or pre-tax price for a customer.
Checking the GST component and gross amount for an invoice.
Estimating tax for budgeting or project quotes in India.

Decision Guide

Best for

Small businesses and freelancers who need fast GST figures for quotes and invoices.
Anyone who needs to know the gross amount when the net amount and GST rate are known.

Avoid when

You need to reverse-calculate net from a gross amount (e.g. “this price includes 18% GST; what is the net?”). This tool assumes amount entered is pre-GST.
You need composite or mixed rates, or state-specific rules; use official GST tools or a tax professional for those cases.

Example

Example: 18% GST on ₹10,000

Input

Amount: 10000, Rate: 18%

Output

Net: ₹10,000.00, GST: ₹1,800.00, Gross: ₹11,800.00

The gross amount (₹11,800) is what the customer pays when 18% GST is applied to ₹10,000.

FAQs

Is the amount I enter before or after GST?

You enter the amount exclusive of GST (pre-GST or net amount). The tool then adds GST and shows you the GST amount and the gross (total including GST).

Which GST rates are supported?

The calculator offers the common Indian GST rates: 5%, 12%, 18%, and 28%. Select the rate that applies to your supply.

Can I use this for invoicing?

You can use it to compute GST and gross amounts. For official invoicing and compliance, ensure you follow the rules applicable to your registration and supply type.

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