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**Sample Size **Formulas for our **Sample Size **Calculator. Here are the formulas used in our **Sample Size **Calculator: **Sample Size**

**Sample size **determination is the act of choosing the number of observations or replicates to include in a statistical **sample**.The **sample size **is an important feature of any empirical study in which the goal is to make inferences about a population from a **sample**.

This project was supported by the National Center for Advancing Translational Sciences, National Institutes of Health, through UCSF-CTSI Grant Number UL1 TR000004.

This is the minimum recommended **size **of your survey. If you create a **sample **of this many people and get responses from everyone, you're more likely to get a correct answer than you would from a large **sample **where only a small percentage of the **sample **responds to your survey.

This calculator is used to determine how many individuals you need to survey in your research in order to gather results that reflect the target population as precisely as desired.

Find out if you have enough people to take your survey. Our **sample size **calculator can help determine if you have a statistically significant **sample size**.

**Sample Size **Calculator Terms: Confidence Interval & Confidence Level. The confidence interval (also called margin of error) is the plus-or-minus figure usually reported in newspaper or television opinion poll results.

How to Calculate **Sample Size**. Scientific studies often rely on surveys distributed among a **sample **of some total population. Your **sample **will need to include a certain number of people, however, if you want it to accurately reflect the...