What this is

This Sample Size Picker is a quick Typeform that helps you choose the ideal sample size, a sensible iterative plan, and the minimum you can get away with when time is tight.

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What you’ll get out of it

A recommendation you can use immediately, plus a short rationale you can share with your team so everyone agrees on “enough”.

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Step 1

Open the Sample Size Picker

Click the Typeform link on this card. You’ll answer three quick questions and get a recommendation at the end.

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Step 2

Choose your research method

Select what you’re running (e.g., discovery interviews, concept testing, diary study, tree test, survey, usability test). This sets the baseline because different methods need different numbers.

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Step 3

Tell us how many segments you’re recruiting

Choose whether you’re recruiting one audience or comparing multiple segments (e.g., new vs existing users). If you’re splitting the sample, the tool will recommend numbers per segment, not just overall.

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Step 4

Select your decision risk / confidence level

Tell us whether this is a low-risk “directional” decision or a high-risk decision that needs stronger confidence. Higher risk = more participants (or more rounds).

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Step 5

Read your recommendations

You’ll get three outputs:

• Ideal sample size (best balance of confidence + speed)
• Iterative plan (a first round + top-up guidance)
• Minimum sample size (when you need to move fast)

Step 6

Add a recruitment buffer

Always recruit extra to cover dropouts/no-shows. If you’re short on time, this step protects your ability to make a decision without scrambling.

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Step 7

Use it to plan your week

Drop the recommendation into your research plan: how many people, by when, and how many you’ll recruit per segment. If you’re iterating, schedule the analysis checkpoint after round one.

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