How to use the inbreeding coefficient calculator
Find the inbreeding coefficient from relatedness. Enter generations to common ancestor (each side) in the field above; the inbreeding coefficient f, percent are computed instantly and plotted on the chart so you can see how the answer changes.
Formula
Variables
- g — Generations to common ancestor (each side)
Worked example
With generations to common ancestor (each side) = 2, the calculator gives inbreeding coefficient f ≈ 0.03125; percent ≈ 3.125 %.
Frequently asked questions
What is the formula for the inbreeding coefficient calculation?
Inbreeding coefficient F = (1 / 2)^(2 × g+1). Percent (%) = 100 × [Inbreeding coefficient F]. Here g is generations to common ancestor (each side).
What inputs do I need for the inbreeding coefficient calculator?
You need generations to common ancestor (each side). Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use this calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.