Confidence Interval Calculator

Instructions: Enter the frequency of the event of interest (numerator) and the total events(denominator).

Example 1: Taysom Hill completed 88 passes (numerator) of 121 attempts (denominator) in 2020, so his completion rate is 72.7% (95% CI: 64.2-79.9%). We are 95% confident that Hill's true completion rate (under similar conditions) is better than 60%.

Example 2: Jameis Winston completed 7 (numerator) of 11 pass attempts (denominator), his completion rate is 64% (95% CI: 35%-85%), so we are NOT 95% confident that Winston's true completion rate (under similar conditions) is better than 60%.

Numerator:
Denominator:



Probability:
Percentage:
Lower 95%: %
Upper 95%: %

More on the data source and modeling methods here