Cousin Calculator
Find out the relationship between two cousins based on their common ancestor. Enter the degrees of separation for each cousin from the common ancestor to determine the exact cousin relationship (e.g., first cousin once removed).
Published by:
isCalculator Editorial Team
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How to use this tool?
This calculator determines the familial relationship between two people based on their generations from a common ancestor.
- Enter Cousin 1's generation in the first field (e.g.,
0for sibling,1for child). - Enter Cousin 2's generation in the second field (same format).
- Click "Calculate Relationship" or press Enter.
- Read the result (e.g., "1st cousins once removed") and the explanation below.
Input rules: Both values must be non-negative integers (0, 1, 2, ...). Negative numbers or decimals will show an error.
Output examples:
0and0→ Siblings0and1→ Parent and child1and1→ 1st cousins2and3→ 2nd cousins once removed
Previous Results
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Frequently Asked Questions
Enter the number of generations each person is from a common ancestor. For example, if both are grandchildren (2 generations), they are first cousins. If one is a grandchild (2) and the other is a great-grandchild (3), they are first cousins once removed.
It means how many steps away each person is from the shared ancestor. For siblings, it's 0 (same parents). For children, it's 1. For grandchildren, it's 2, and so on.
That means both are siblings (same parents). The calculator will output 'Siblings'.
'Removed' indicates a difference in generations. For example, first cousins once removed means one is a generation older or younger than the other.