Chance of N Children All with a Trait Calculator
🧬 Genetics & evolution. Use the Chance of n children all with a trait formula to find probability, chance for one child, number of children: pick the value you want, type the others, and the answer updates as you go.
Each child is independent: for Bb × Bb, the chance of a bb child is 0.25 every time.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Probability | no unit |
| Chance for one child | no unit |
| Number of children | no unit |
Worked example
Find the probability when Chance for one child = 0.25, Number of children = 2.
Using P = p^( n): Probability = 0.0625.
Frequently asked questions
What is the formula for Chance of n children all with a trait?
P = p^( n). Each child is independent: for Bb × Bb, the chance of a bb child is 0.25 every time.
What do the letters stand for, and what units are used?
Probability, Chance for one child, Number of children.
How do you calculate probability?
Put the values into P = p^( n). For example, with Chance for one child = 0.25, Number of children = 2, probability = 0.0625.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (probability, chance for one child, number of children) and fill in the others: it rearranges the formula for you.
