Research sample size calculator

Confidence level ?The probability that your sample accurately reflects the attitudes of your population. The industry standard is 95%. Choose value, please

Choose positive value, please

Required Sample Size: Enter correct values, please



How many people do you need to take part in your research? It can be difficult to determine the sample size. The sample size is the number of completed responses received by your survey. It is called a sample because it represents only part of the group of people (or target group) whose opinion or behavior you are concerned about. Want to know how to calculate that? Our sample size calculator makes it easy. We have created our sample size calculator for your research to be more statistically significant. This sample size calculator is presented as a publicly available research software service for Scheduling Worldwide. You can use it to determine how many people need to be interviewed in order to obtain results that accurately reflect the target group. You can also find the level of accuracy you have in an existing sample.


There are two types of sampling errors: statistical and systematic. The statistical error depends on the size of the sample. The larger the sample size, the lower the sample size.

In some cases, when true distributions are known, a systematic error can be counterbalanced by the introduction of quotas or the overweighting of data, but in most real-world studies it is even quite problematic to estimate it.

Not sure what values to use? This quick reference guide explains the terms used in our sample size calculator and provides recommended values for optimal results.

Enter your choice in the calculator below to find the desired sample size or confidence interval you have.

Here are several key terms you need to understand to calculate the sample size and give it context:

General population: The total number of people in the group you are trying to study.

Margin of error: A percentage that shows how much you can expect your survey results to reflect the views of the general population. The smaller the margin of error, the more representative the total population will be. However, reducing the error will also lead to a sharp increase in sample size. We recommend using a standard error of 5%, which should never exceed 10%.

Confidence level: A percentage that shows how confident you are that the population will choose an answer within a certain range.

In market research, the most frequently used level of confidence is 95%. A higher confidence level indicates a higher probability that your results are accurate, but an increase in the sample size can significantly increase the sample size required. Finding a balance between confidence and achievable research goal is crucial.

Generally, an empirical rule is that the larger the sample size, the more statistically significant it is, i.e., the less likely your results will be a match.

But you may be wondering if the sample size is statistically significant. The truth is that this is an individual situation. A sample of an interview can still give you valuable answers without having a sample size that represents the general population. Client feedback is one study that does this regardless of whether you have a statistically significant sample size. By listening to what customers think, you will be able to assess how you can improve your business.

Use the calculator to determine how many people you need to fill in a survey or survey to be sure the results are accurate.


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