免费 · 营销与社交媒体
样本量计算器.
计算 A/B 测试每个版本所需访客数，或问卷达到指定误差范围所需的回答数。
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使用方法: 样本量计算器
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英语技术说明
Assumes random samples. More than two variants use a Bonferroni-corrected significance level. Everything is calculated in your browser; nothing you type is uploaded.
A/B: the standard two-proportion formula. Survey: n₀ = z² p (1 − p) ÷ e² with the finite population correction.
With a 5 % baseline and a 10 % relative lift at 95 % confidence and 80 % power, you need 31,234 visitors per variant; a survey at ±5 % needs 385 responses.