Free online calculator · India

GST Calculator

Calculate GST at 5%, 12%, 18% or 28%. Add GST to a base price or extract GST from an inclusive price.

What this calculator does

Use this GST calculator to estimate the tax component and final price. Choose whether the entered amount is before GST or already includes GST, then select the rate applicable to the goods or services. Verify classification and current rates before invoicing.

How to use it

Enter the amount
choose add/remove GST
select the rate
review taxable value, GST and total.

Calculate now

Formula and calculation method

GST on base amount = amount × rate ÷ 100. Total = amount + GST. For an inclusive price, taxable value = inclusive amount ÷ (1 + rate ÷ 100); GST = inclusive amount − taxable value.

Worked example

A taxable value of ₹10,000 at 18% gives GST of ₹1,800 and a total of ₹11,800. If ₹11,800 already includes 18% GST, the embedded GST is ₹1,800.

Important information

GST is generally split into CGST and SGST for intra-state supplies, while IGST generally applies to inter-state supplies. This tool shows combined GST. Select a rate only after checking official classification guidance.

Frequently asked questions

How accurate is this calculator?

It provides an estimate based on the values and assumptions entered. Verify important decisions with the relevant provider or a qualified professional.

Does this replace professional advice?

No. It is an informational tool and does not replace tax, legal, accounting, lending, investment or medical advice.

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Results are estimates based on entered values and assumptions. They are not professional advice. Verify important decisions with the relevant provider or a qualified professional.