Sample size recommendations by goal
How to think about sample size
Start smaller, then expand if needed. You can always add more respondents to a completed survey by selecting “Increase sample size” on your results page. New respondents are added to the same survey — no need to rebuild it. This makes it easy to start with 50 and scale up to 100 or 200 if you want more confidence in the results. Consider your testing approach. Many PickFu users run 3–5 surveys per creative asset (packaging, listing images, book covers, etc.), iterating based on feedback each time. If you’re planning multiple rounds, 50 respondents per round is more efficient than one survey with 200. Factor in targeting. If you’re using audience targeting with multiple trait categories, a smaller sample size (15–50) may complete faster than a large one. Highly targeted surveys with 200+ respondents can take significantly longer because the qualified respondent pool is smaller. Budget accordingly. Larger sample sizes cost more. If you’re working with a limited budget, smaller surveys with focused questions often give you better ROI than one large survey.When 15 respondents is enough
Don’t underestimate small sample sizes. 15 responses can be plenty when you need to quickly decide between two clear options, resolve a disagreement on your team, or get an early read on a concept before investing more time. The written feedback alone often surfaces issues that a larger sample wouldn’t change.When you need 200+
Larger sample sizes matter most when small differences between options need to be statistically reliable — for instance, when choosing a product’s main image for a high-traffic listing, or when presenting research findings to stakeholders who expect rigorous data. They’re also useful for audience discovery, where you’re trying to understand how different demographic segments respond differently.You can always add more
This is worth repeating: you don’t have to get the number right on the first try. After your survey completes, select Increase sample size at the top of your results page to add new respondents to the same survey. The new responses are added alongside the originals, and your results update automatically.FAQs
What sample sizes are available?
15, 30, 50, 75, 100, 200, 300, and 500 respondents. If you need 1,000+ respondents, contact us at support@pickfu.com to discuss enterprise options.Does sample size affect how long my survey takes?
Yes. Larger samples take longer to complete, especially with audience targeting. A 50-person random survey might finish in 15 minutes; a 500-person targeted survey could take much longer. Learn how targeting affects completion time.Should I use a bigger sample to compensate for narrow targeting?
Not necessarily. If your targeting is already narrow, a bigger sample size just means it takes even longer to find enough qualified respondents. It’s usually better to simplify your targeting than to increase sample size to compensate.Related Articles