GST Calculator

Calculate GST (Goods and Services Tax) amount and total price — either by adding GST to a base price or extracting the base price from a GST-inclusive amount.

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

This calculator adds GST to a base price, or extracts the base price and GST amount from a price that already includes GST, for any GST rate you enter.

Amount *

₹

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

₹1,800

GST amount

Base amount (excluding GST)₹10,000

Total amount (including GST)₹11,800

AI explanation

Formula

Exclusive: GST = Amount × Rate/100, Total = Amount + GST. Inclusive: Base = Amount / (1 + Rate/100), GST = Amount − Base

Worked example

₹10,000 at 18% GST (exclusive)

Worked example: ₹10,000 at 18% GST (exclusive)
Field	Value
Amount	10000
GST rate	18
Calculation type	exclusive
Base amount (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

What are the current GST rate slabs in India?

GST in India is commonly charged at 5%, 12%, 18%, or 28% depending on the goods or service, with some items exempt or taxed at special rates. Check the GST portal for the rate applicable to your specific item, as rates are revised periodically by the GST Council.

What is the difference between GST-inclusive and GST-exclusive amounts?

An exclusive amount does not yet include GST — GST is added on top. An inclusive amount already has GST built in — this calculator can extract the base price and GST portion from it.

Can I use this for an invoice with multiple GST components (CGST + SGST)?

Yes — the total GST amount shown is the combined tax; for an intra-state invoice this is typically split equally into CGST and SGST at half the rate each.

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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