The Equal Measures 2030 (EM2030) Sustainable Development Goals (SDGs) Gender Index, launched as a pilot version with six countries in 2018, is a tool that gender advocates can use to frame their influencing on the gender equality elements of the SDGs. The 2019 version is the first global version including data of 129 countries. This audit delves into data quality issues, the conceptual and statistical coherence of the framework and the impact of modelling assumptions on the results to ensure the transparency and reliability of the Gender Index. .The conceptual framework of the index covers 14 out of the 17 SDGs, with focus on the gender aspect: poverty, no hunger, health, education, gender equality, water and sanitation, energy, work, industry, innovation and infrastructure, inequality, sustainability, climate, peace and justice, partnerships.