Speed Remainder - Fractional speed remaining on the mod that will add to the next roll
Cost - Number of Attenuators required to calibrate
Speed Hit % - Chance that a calibration will give stats to speed (25% normally, 33% if another stat has 5-rolls)
Avg +Speed - Expected speed gain from any one calibration (combines Speed Remainder and Speed Hit %)
Speed per Cost - Avg +Speed divided by Cost
Weighted +Speed - Expected speed gain, with each speed increment given additional value based on the final total speed (will prioritize higher speed mods)
Weighted per cost - Weighted +Speed divided by Cost. I consider this the best single metric for a calibration candidate, though the player should consider overall mod synergy, depth, and other factors.