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%.