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Research sample size calculator

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

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    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.


    Should we trust public opinion polls results, what’s research proposal sample and general totality (population)? Today we are going to talk about customer service metrics calculator and its main components for carefully thought-out study. Let’s clear up some definitions first.

    Science First

    General population means all objects (units) totality with respect to which conclusions are drawn when studying specific problem. Population composition depends on study objectives.

     A sample means any subgroup of a cases (objects) set allocated for analysis. Method of representation (sampling method) is a research method that allows us to draw a conclusion about the nature of distribution of studied characteristics of general population based on consideration of its some part (selection totality). That’s why a research calculator needed.

    Sum-total means any group of people, organizations, events that we are interested in, about which we want to draw conclusions. Representative sampling is one of key concepts of a sample data analysis method. This is a selection in which all main general population characteristics, from which it’s extracted, are presented in approximately the same proportion or with the same frequency with which given characteristic appears in this general population. In other words, representative sample is a smaller but accurate model of population that it should reflect.

    Counting Up the Findings

    Selection size is determined with the help of sample variance calculator taking into account the requirements of accuracy and efficiency. These requirements are inversely proportional to each other: the larger selection size is, more accurate result is. Moreover, the higher accuracy is, correspondingly more costs are required to conduct a study. And vice versa, the smaller selection is, the lower its cost is, the less accurately and more randomly reproduced general population properties.

    Therefore, to calculate the amount of choice, sociologists invented sample size (SS) calculation formula and created a special calculator, which include Confidence Probability (“Accuracy”), Confidence Interval (“Accuracy” ±%), and General Population (“Total Respondents”):

    SS =  Z2 * (p) * (1 – p) / C2 


    Z = Z factor (e.g. 1.96 for 95% confidence interval),

    p = percentage % of respondents or answers of interest, in decimal form (0.5 by default),

    c = confidence interval, decimal (e.g. 0.04 = ± 4%).

    In calculator sample size, confidence means a measure of accuracy. Confidence error is a research results possible error.

    For research proposal example, with general population more than 50000 people (living in some city), the selection will be 384 people with confidence level 95% and error 5% (with a confidence interval 95 ± 5%). It appears, when conducting 100 studies with such selection (384 people) in 95 percent of cases, the answers received according to the laws of statistics will be within ± 5% of original. And we get a representative sample with minimal statistical error probability.

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