Relationship Calculator

Kinship Calculator
Quickly calculate family relationship terms and how each person addresses the other
My Gender
Examples:
Relationship Path
What I call them
What they call me
Relationship Details
Expand to view the family relationship tree
Explore Further
Click any relationship term to append it to the chain and continue calculating
How to Use
  • “Find Term from Relationship”: Click relationship buttons one by one to build a chain (e.g. Father → Older Brother = Uncle) and calculate the result in real time.
  • “Find Relationship from Term”: Enter the term you use for the other person to work backward and determine the relationship chain.
  • Powered by the open-source relationship.js engine (MIT License), supporting multiple terms for one relationship, escaping, and other ambiguous results. All calculations are performed locally in the browser.

Calculate family relationships and find the correct relationship term

Relationship Calculator

The relationship calculator helps identify family relationships and the appropriate relationship terms. For example, selecting father followed by father’s brother can determine the corresponding relationship. Multiple relationship steps can be combined to handle more complex family structures.

How to use the relationship calculator

Start from yourself and select each family relationship step by step. For example, choose father and then father’s brother. The tool calculates the resulting relationship automatically. Additional relationship steps can be added for more complex cases.

Two-way relationship lookup

The tool supports both directions. You can check how you should address another relative and how that relative should address you.

Complex family relationships

The calculator supports parents, grandparents, uncles, aunts, siblings, children, cousins, and other multi-level family relationships. Results are based on common relationship terminology.

Regional differences

Family terminology can vary by country, region, dialect, and family tradition. The results are therefore intended as common reference terms rather than universal rules.

Use cases

  • Find the correct family relationship term
  • Understand complex family relationships
  • Check relationships on either side of the family
  • Look up relationships from an existing term
  • Organize family and genealogy information

Result notes

Relationship results are provided for reference. Local terminology and family customs may produce different terms for the same relationship.

What is a relationship calculator?

A relationship calculator determines family relationships and common relationship terms by combining relationship steps such as parent, sibling, child, uncle, aunt, and cousin.
  • Build family relationships step by step
  • Support two-way relationship lookup
  • Reverse lookup from a relationship term
  • Handle complex multi-level family relationships
  • Support gender-specific relationship terminology where applicable
  • Provide common terminology while allowing for regional differences
The tool is useful for family gatherings, genealogy research, and understanding complex relationships. Terminology may vary by region and family tradition.
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