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Sample size calculator for survey and market research planning.
Estimate how many completed responses and invitations you need before launching a pricing, product, expert, or customer study.
Planning estimate
Completes
382
Invites
849
Per segment
382
Confidence
95%
This is a solid planning estimate for directional business decisions.
Use 50% proportion by default
This is the conservative planning case when you do not know the answer distribution.
Plan by segment
If you need reads by buyer type, country, role, or company size, calculate completes per segment.
Invites are not completes
Incidence, screening, attention checks, and dropout all reduce the usable completion rate.
Turn the estimate into a study.
Open a template, define your segments, and launch with the right quality gates.