Key Comparison Database (KCDB)

The Key Comparison Database (KCDB) is an online resource managed by the International Bureau of Weights and Measures (BIPM). It records and shares results from international comparisons of measurement standards, known as key comparisons. These comparisons ensure consistency and accuracy among different national measurement institutes. By tracking and validating measurement equivalence worldwide, the KCDB supports reliable trade, scientific research, and technological development, enabling countries to trust each other’s measurements and maintain global standards.