Note: this calculator was updated on 5-15-2021. See an explanation and peak projections leveraging these MLB equivalencies here. Since the information to compute equivalencies for the new minor league leagues is not yet available, the calculator assumes the new Double-A is as hard as the old Double-A, etc. The calculator does however incorporate the new 2021 minor league run environments. Let me know if you have any feedback @rosenjordanblum on Twitter.