This calculator is available for your convenience. The reliability of the results depends on the accuracy of the information you enter.
The CRA automatically determines your CCB eligibility each year when you file your tax return. The Canada Child Benefit is a non-taxable benefit so you do not receive a slip for this income and do not need to enter the benefit amount you received on your tax return.
For further information:
Why isn't the Canada Child Benefit (CCB) appearing on my return?
Child and family benefits calculator