Download a calculator to estimate a problem's impact on the whole user population from any sample size. Just enter the number of users who experience a problem and the sample size. This calculator also estimates the probability you can detect problems given your sample size. | |||||

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## Features & Benefits**Estimate a problem's impact on all users**: If you see 2 out of 10 users experiencing a problem this calculator will provide the most likely percentage of users who will experience the problem (between 5% and 52%).**Test the problem frequency seen in a sample against a test percentage**: If 2 out of 10 users have a problem locating a product, the probability exactly 20% of all users will also have this problem is 30%.**Find the chance you'll be able to detect problems given your sample size**: At a sample size of 10, the probability of seeing a problem in a usability test that affects 30% of users is 97%. The probability of seeing problems that affect only 1% of users is 9.6%.
## Who Should BuyAnyone who needs to understand both the power and limits of small sample data for detecting UI problems or defects. This calculator will provide you with:- How many users are likely experiencing a particular problem.
- The chance you have of seeing a problem in a test given a small sample size.
- The probability a problem affects a specific percent of all users.
## Select Sample Screen Shots | |

## What Customers are Saying:Thanks for the calculator. It hits the spot perfectly. I played with it for 15 minutes and all the elements are understandable and I can see what's happening. Philip Hodgson Ph.D. Blueprint Usability |

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