RESEARCH: Converting from x/9 to %-based metrics

Editor's note: This article appeared in the 2021 Baseball Forecaster. This week, we are making the corresponding changes to add these % denominators here on the web site. In Playerlink, use the "Show %" button on the top of the page to toggle between old x/9 metrics and new %-based metrics. In the Stats and Projections files, and in the Custom Draft Guide output, you'll find both x/9 and %-based numbers for a while, as we make this transition.


For years, Dominance (K/9), Control (BB/9) and Command (K/BB) have been mainstays of pitcher analysis within both the Baseball Forecaster and at In analyzing skills, not outcomes, these per-9-inning metrics have been an invaluable tool for shedding light on a player’s...


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