How do I remove GST from a total amount?

Enter the total amount that already includes GST and select the applicable GST rate. The calculator will calculate the original amount before GST and the GST component included in the total.

How do I calculate an amount without 18% GST?

If an amount includes 18% GST, divide the GST-inclusive total by 1.18. The result is the original amount before GST.

Can I subtract 18% directly to remove 18% GST?

No. GST is calculated on the original value, not on the GST-inclusive total. Subtracting 18% directly from the final amount will therefore produce a different and incorrect base amount.

What is a GST-inclusive amount?

A GST-inclusive amount is the final price after GST has already been added to the original value.

What is a GST-exclusive amount?

A GST-exclusive amount is the original value before GST is added.

Can I remove 5%, 12%, 18% and 28% GST?

Yes. You can quickly select 5%, 12%, 18% or 28% GST, or enter a custom GST percentage.

How much GST is included in ₹1,180 at 18%?

If ₹1,180 already includes 18% GST, the original amount is ₹1,000 and the GST included in the total is ₹180.

Can I use this calculator to check an invoice?

You can use it to calculate the mathematical GST component included in an amount. It does not determine whether GST applies or which GST rate is legally correct.

Is the Remove GST Calculator free?

Yes. The ToolVerse Remove GST Calculator is free to use and does not require registration.

Remove GST Calculator - Calculate Amount Without GST

Remove GST Calculator

Remove GST from a GST-inclusive amount and instantly calculate the original amount before GST and the GST included in the total.

Remove GST instantly 5%, 12%, 18% & 28% Free to use

Remove GST

What is a Remove GST Calculator?

A Remove GST Calculator helps you find the original amount before GST when the amount you have already includes GST.

It separates a GST-inclusive total into the original value and the GST amount included in that total.

How to remove GST from a total amount

To remove GST correctly, you need to reverse the calculation that was originally used to add GST.

Amount Without GST = Inclusive Amount ÷ (1 + GST Rate ÷ 100) GST Amount = Inclusive Amount − Amount Without GST

Example: Remove 18% GST from ₹1,180

Suppose a total price of ₹1,180 already includes 18% GST.

₹1,180 ÷ 1.18 = ₹1,000 ₹1,180 − ₹1,000 = ₹180 GST

Therefore, the original amount without GST is ₹1,000 and the GST included in the final price is ₹180.

Why subtracting 18% directly is incorrect

If ₹1,180 includes 18% GST, calculating 18% of ₹1,180 gives ₹212.40. Subtracting that amount would give ₹967.60, which is not the original taxable value.

This happens because the 18% GST was originally calculated on ₹1,000, not on the final ₹1,180 total.

How to use this calculator

1. Enter the total

Enter the final amount that already includes GST.

2. Select GST rate

Choose 5%, 12%, 18%, 28% or enter another rate.

3. View original amount

The calculator shows the value before GST.

4. View GST included

See the GST component contained in the total.

GST inclusive vs GST exclusive

GST inclusive

The amount already contains GST.

GST exclusive

The amount is before GST has been added.

Remove common GST rates

Remove 5% GST

Divide the GST-inclusive amount by 1.05.

Remove 12% GST

Divide the GST-inclusive amount by 1.12.

Remove 18% GST

Divide the GST-inclusive amount by 1.18.

Remove 28% GST

Divide the GST-inclusive amount by 1.28.

Examples of removing GST

₹1,050 including 5%

Without GST: ₹1,000
GST: ₹50

₹1,120 including 12%

Without GST: ₹1,000
GST: ₹120

₹1,180 including 18%

Without GST: ₹1,000
GST: ₹180

₹1,280 including 28%

Without GST: ₹1,000
GST: ₹280

When can a reverse GST calculation be useful?

Removing GST can be useful when reviewing an GST-inclusive price and you need to understand the original value and the tax included in the final total.

Invoice checking

Check the mathematical GST component in an inclusive invoice amount.

Price comparison

Compare prices based on their value before GST.

Quotations

Calculate the underlying value of a quote that includes GST.

Quick calculations

Perform reverse GST calculations without calculating the formula manually.

Does the calculator calculate CGST, SGST or IGST?

This calculator calculates the total GST component. It does not determine whether that GST should be split into CGST and SGST or treated as IGST.

Tax disclaimer

This calculator performs percentage-based calculations for general information and estimation.

It does not determine the legally applicable GST rate, classification, place of supply, input tax credit eligibility or other compliance requirements. For important tax decisions, check current official guidance or consult a qualified professional.