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Prior research consistently finds a gender gap in financial knowledge where males appear to outperform females. Despite the wealth of studies attempting to explain this gap, none have considered whether the gender gap may be a product of measurement method. This study re‐examines the gender gap with item response theory (IRT) which can account for guessing behavior and differential item functioning. Survey data on 184,869 individuals from 39 countries and territories is analyzed. Results show that when IRT is employed, a gender gap exists in only 54% of the sample. In contrast, when a conventional measurement approach is used, there is a gender gap in financial knowledge in 81% of the sample. These results reveal that prior measurements may underestimate women's financial knowledge and inflate the gender gap. [ABSTRACT FROM AUTHOR]