A common problem among researchers who summarize the field as part of a lecture or textbook is how trustworthy the fundament of psychology actually is. To estimate the replicability of classical psychological findings, we coded test statistics comparing for all studies listed on Wikipedia's table of classical psychological findings (https://de.wikipedia.org/wiki/Liste_der_klassischen_Experimente_in_der_Psychologie). Standardized effect sizes could be computed for 18 out of 56 publications (31 effect sizes). Expected replicability rate according to Z-curve is 64% with 95% CI [39%, 90%]. Regarding quality assurance and advancement of knowledge, our results suggest that further replication studies are needed to examine existing classical psychological findings.