This is a collection of calculators that can be used to estimate the proportion of a dichotomous result in a sample. It includes options for both binomial and normal approximation, as well as the Wilson score method. The user must input the sample size, number of successes, and confidence level to calculate the confidence interval for the proportion. The calculators also provide step-by-step instructions and error bar diagrams. Two methods by Robert Newcombe are used to calculate the 95% confidence interval.