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Sample Size Calculator
Figure out how much data you need for a reliable result.
Updated June 2026
The prompt
Help me determine the sample size needed for {{study_type}} to detect {{effect}} with reasonable confidence. Explain the inputs that drive sample size (baseline, minimum detectable effect, confidence and power, variability), walk through a sensible calculation, give the recommended sample and duration, and explain the trade-off between a smaller faster study and a more reliable one. Note the risk of an underpowered study that cannot detect a real effect and what to do if the needed sample is impractical.
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AI Khazna
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