GST Inclusive Calculator

Extract the base price and GST amount from a price that already includes GST — enter the GST-inclusive amount and rate to see the base price and tax portion.

Free to use
Accurate results
No registration required
Works on all devices

Enter a GST-inclusive amount and the GST rate to extract the base price and the GST portion using Base = Amount / (1 + Rate/100).

GST-inclusive amount *

₹

The total price you were charged, which already includes GST.

GST rate *

Common slabs are 5%, 12%, 18% and 28% — verify the current rate for your specific item on the GST portal.

Calculation type

Add GST (amount excludes GST)

Remove GST (amount includes GST)

Your result

₹10,000

Base price (excluding GST)

GST amount₹1,800

Total amount (including GST)₹11,800

AI explanation

Formula

Base = Amount / (1 + Rate/100); GST = Amount − Base

Worked example

₹11,800 GST-inclusive amount at 18% GST

Worked example: ₹11,800 GST-inclusive amount at 18% GST
Field	Value
GST-inclusive amount	11800
GST rate	18
Calculation type	inclusive
Base price (excluding GST)	10000
GST amount	1800
Total amount (including GST)	11800

Assumptions

The GST rate must be selected by you — this calculator does not determine which slab applies to a specific good or service, since that depends on current GST Council notifications.
Does not model compensation cess or other item-specific levies.

Frequently asked questions

How do I find the base price from a GST-inclusive amount?

Divide the GST-inclusive amount by (1 + GST rate/100) to get the base price, then subtract the base price from the inclusive amount to get the GST portion.

When would I need to remove GST from a price?

This is useful when a quoted or billed price already includes GST and you need to know the pre-tax base price — for accounting, reimbursement, or comparing prices across sellers who quote inclusive vs exclusive prices.

Is this the same as the GST Exclusive Calculator?

No — the GST Exclusive Calculator adds GST on top of a base price. This calculator does the reverse: it extracts the base price and GST from an amount that already includes tax.

Related calculators

Sources

Goods and Services Tax portal — Government of India. Effective 01-07-2017, reviewed 12-09-2026.

GST rates vary by product/service category and are set by the GST Council, which revises them periodically. Verify the current applicable rate for your specific goods or service on the official GST portal before relying on this calculation for filing or invoicing.

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