Calculation method
COI = Σ (1/2)^(n₁+n₂+1) × (1 + Fₐ)For each independent path to a common ancestor, Wright’s contribution is calculated from the generations on both sides and any known inbreeding of that ancestor, then contributions are summed.
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Pedigree COI and inbreeding calculator
4–5 generations, common ancestors and completeness
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HOW IT WORKS
A result to understand, not just read.
Estimate pedigree completeness and the coefficient of inbreeding from common ancestors across four or five generations. The result is only as reliable as the names, links and generations entered.
OFFICIAL SOURCES
royalkennelclub.com↗FREQUENTLY ASKED QUESTIONS
How does pedigree coi and inbreeding calculator work?+
For each independent path to a common ancestor, Wright’s contribution is calculated from the generations on both sides and any known inbreeding of that ancestor, then contributions are summed.
What should I check before relying on the result?+
Missing pedigree data usually understates COI, while pedigree COI does not equal a genomic result. Seek breed-specific genetic advice.
RESULT GUIDE
How to use pedigree coi and inbreeding calculator
Estimate pedigree completeness and the coefficient of inbreeding from common ancestors across four or five generations. The result is only as reliable as the names, links and generations entered.
Practical example
- Enter both parents’ pedigrees consistently and identify repeated ancestors without merging different animals with similar names.
Missing pedigree data usually understates COI, while pedigree COI does not equal a genomic result. Seek breed-specific genetic advice.
How to interpret the result
- Read COI together with health testing, population diversity and breeding goals; a single percentage cannot judge a mating.
- Change one input at a time to understand which assumption has the greatest effect on the result.
What the estimate does not include
- Missing pedigree data usually understates COI, while pedigree COI does not equal a genomic result. Seek breed-specific genetic advice.
- Use the result as a planning aid and confirm sensitive financial, health or animal-care decisions with the relevant document or qualified professional.
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We try to avoid intrusive banners, autoplay videos, aggressive advertising links and misleading patterns. If this service helped you, you can support it with a voluntary contribution that helps cover its costs, improve it and keep it available to everyone.
Who’s behind CalcuPopSupport CalcuPopCard via Stripe or PayPalStripe or PayPal handles your payment. CalcuPop never sees or stores your card details.