Confidence Interval Calculator

Confidence Interval Calculation

Sample Size Calculator

Confidence Interval Calculator is an online Probability and Statistics tool for data analysis programmed to calculate the statistical accuracy of a survey-based estimate. This calculator generate the output value of confidence interval according to the respective input values of confidence level, sample size, population and percentage


In statistics it is important to measure how certain we can be in the results of an analysis or experiment. One way of computing the measure of confidence in statistical results is to review the confidence interval reported by researchers. Confidence intervals express the range within which a result for the whole population would occur for a particular proportion of times an experiment or test was repeated among a sample of the population. Confidence interval is a standard way of articulate the statistical accuracy of an experiment based assessment. If an assess has a high error level, the equivalent confidence interval will be ample, and the less confidence we can have that the experiment results depict the situation among the whole population

When quoting confidence It is common to refer to the 95% confidence interval around an experiment assessment or test result, even though other confidence intervals can be reported (e.g. 90%, 95%, even 99%). We can be rationally confident that the range comprises the true value for the population as a whole where a 95% confidence interval is reported. The characteristics of a normal distribution describe the measure of a confidence interval. The confidence interval is the mean ±1.96 multiplied by the standard deviation when the statistic is distributed normally

Confidence Interval Formula

Confidence interval can be calculated from the formula
Confidence Interval Formula

The collection of tools employs the study of methods and procedures used for gathering, organizing, and analyzing data to understand theory of Probability and Statistics. The set of ideas which is intended to offer the way for making scientific implication from such resulting summarized data. In many applications it is necessary to calculate the confidence interval for a given set of data, where this online confidence interval calculator can help you to effortlessly make your calculations for given data set

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