Genealogy Calculators
Free genealogy calculators: ancestor count by generation, DNA relationship estimator, generation gap, and family tree analysis tools.
Centimorgan to Relationship Calculator
Translate shared centimorgans (cM) from a DNA test into the most likely relationships. Based on Shared cM Project ranges from millions of tested matches.
Endogamy DNA Adjustment Calculator
Adjust shared cM for endogamous populations (Ashkenazi Jewish, Acadian, Polynesian, etc.). Endogamy inflates shared DNA above the standard cousin tables.
Most Recent Common Ancestor Calculator
Calculate the number of generations back to the most recent common ancestor (MRCA) for any two relatives. Useful for tree planning and relationship verification.
Genealogy Birth Year Estimator
Estimate your ancestor's birth year from census records. Enter the census year and recorded age to calculate birth year with margin of error.
Pedigree Collapse Calculator
Estimate how pedigree collapse reduces unique ancestors over generations. Compare theoretical 2^N ancestors to a realistic count for your population size.
Ancestor Count Calculator
Calculate how many direct ancestors you have at any generation. Great-grandparents, 5th great-grandparents — the numbers grow fast.
Blood Percentage and Genetic Relatedness Calculator
Calculate shared DNA percentage between family members. Understand genetic relatedness for parents, siblings, half-siblings, cousins, and other relationships.
Cousin Relationship Calculator
Calculate cousin relationships in your family tree. Find out if someone is your first cousin once removed, second cousin, or third cousin.
DNA Relationship Calculator
Calculate the expected percentage of DNA shared with a relative. From first cousins to half-siblings — understand genetic genealogy.
Generation Gap Calculator
Calculate the approximate birth year of an ancestor N generations back. Uses average generation length of 25-30 years to estimate when they lived.