# Sample Size Calculator

This calculator gives out the number of sampling/observation needed for a measurement based on the requirements.

## Find Out Sample Size

Confidence Level: | ||

Confidence Interval: | % | |

Population Size: | Leave blank if unlimited population size. | |

## Find Out Confidence Interval

Confidence Level: | ||

Sample Size: | ||

Percentage: | % | |

Population Size: | Leave blank if unlimited population size. | |

## Definition

**Confidence Interval:** In statistics, a confidence interval is a particular kind of interval estimate of a population parameter. Instead of estimating the parameter by a single value, an interval likely to include the parameter is given. e.g. 40±2 or 40±5%.

**Confidence Level:** Also called confidence coefficient, Confidence level represent the possibility that the confidence interval is to contain the parameter. e.g. 95% confidence level.

**Population Size:** In statistics, population is the entire entities concerning which statistical inferences are to be drawn. The population size is the total number of the entire entities.

**Percentage:** The percentage of a particular answer was chosen.