How do I calculate GST on an exclusive amount?

For exclusive pricing, GST amount is calculated as Amount × GST rate ÷ 100, and total amount is Amount + GST amount.

How do I calculate GST on an inclusive amount?

For inclusive pricing, taxable amount is Amount ÷ (1 + GST rate ÷ 100), and GST amount is Amount − taxable amount.

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GST Calculator

Calculate GST amount for inclusive or exclusive pricing and get an instant split of taxable value and final total.

Inclusive and exclusive modes

Common GST slabs

Instant tax breakdown

Calculator suite

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Step 1

GST inputs

AmountBase amount before GST.GST rate (%)Tax modeQuick GST slabsPick a standard slab quickly, or keep Custom and type any GST rate above.

Live result

GST result

GST amount

INR 180

GST component based on selected rate and tax mode.

Taxable amount

INR 1,000

GST amount

INR 180

Total amount

INR 1,180

GST rate

18%

Formula used

Exclusive formula

gstAmount = amount × gstRate ÷ 100; totalAmount = amount + gstAmount; actualAmount = amount

Inclusive formula

actualAmount = amount ÷ (1 + gstRate ÷ 100); gstAmount = amount - actualAmount; totalAmount = amount

Frequently asked questions

What is the difference between inclusive and exclusive GST?

Exclusive means GST is added on top of the entered amount. Inclusive means the entered amount already contains GST and the calculator extracts the tax part.

Which GST slabs can I use?

You can use any valid GST rate. Quick slab buttons include common rates such as 0%, 5%, 12%, 18%, 28%, and 40%.

Can I use this for estimates before creating an invoice?

Yes. It helps estimate taxable value and GST split quickly so you can prepare item pricing and invoice totals faster.