Sample Size Marketing Calculators

Use the Sample Size Marketing Calculators to determine a sample size for testing the response to an upcoming B2B or B2C direct marketing campaign, or for a research survey in which you want to determine how many people to interview or send questionnaires (the minimum sample size).

This Sample Size Calculator includes 4 different tools for calculating sample size for testing and surveying.

1. Infinite Universe Marketing Campaign Sample Size Calculator
2. Infinite Universe Sample Size Calculator for Surveys and Testing
3. Finite Universe Sample Size Calculator for Surveys and Testing where there is a finite universe of people
4. Confidence Interval (Margin of Error) Calculator where both the sample size and population are known.

Background

The confidence level is expressed as a percentage and represents how sure you are that the actual percentage of the population who would respond lies within the percentage limit of error. The 95% confidence level means you can be 95% certain; the 99% confidence level means you can be 99% certain. Most researchers use the 95% confidence level. Greater confidence will generate larger sample sizes.

The percentage limit of error is the plus-or-minus error amount or deviation (expressed as a percentage) that you are willing to tolerate from your projected response rate. For example, if you enter a 2% response rate and are willing to accept an error (or deviation) in response of /- .3% (i.e., response between 1.7% and 2.3%) at a confidence level of 95%, your sample size will be 8,366.  Enter the percentage as a whole number and / or decimal (i.e., 10 or .1 for 10%, 1 or .01 for 1%, .001 for .1% of a percent, etc.

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