Chance of birthday match
Find di chance say at least two people get di same birthday.
Your numbers
At least one birthday match
E assume birthdays dey independent and every date get equal chance; actual birth dates no spread evenly.
Compare scenarios
You fit keep up to three snapshots for this tab. Loading one go replace the present inputs.
Formula
Use P = 1−∏ᵢ₌₀ⁿ⁻¹(1−i/d). n na people and d na equally likely days; di product na probability of no match. If people pass days, match must happen. Di result assume independent birthdays.
Find di chance say at least two people get di same birthday.
Example wey show the calculation
- People
- 23
- Days wey get equal chance
- 365
- At least one birthday match
- 50.7297234324 %
Where e fit work and limits
E assume birthdays dey independent and every date get equal chance; actual birth dates no spread evenly.
We check inputs for missing values and allowed ranges. Result wey pass the finite numeric range no go show. Rounding affect wetin display, while calculation use the model numeric precision.
Check your units and assumptions before you rely on result. Changing label no convert currency or physical unit.
Version of di formula: 3152b69c6ae2 · Example don get check: