Offensive Runs Above Average (wRAA) translates a hitters weighted on base average into the currency fans care most about: runs.
By comparing a player to league average and scaling by plate appearances, wRAA estimates how many additional or fewer runs a batter produced.
The calculator below lets you plug in a weighted OBA and plate appearance total to see exactly where a hitter stands relative during a full season.
Offensive Runs Above Average Calculator
Frequently Asked Questions
What is wRAA?
Offensive Runs Above Average measures the number of runs a hitter produced or cost his team compared with an average batter, adjusted for league run environment.
What inputs does this calculator require?
You only need the hitter's weighted on base average and plate appearances.
The tool uses league constants internally.
What league wOBA and scale values are used?
The calculator assumes a league wOBA of 0.320 and a wOBA scale of 1.20, the typical range for recent MLB seasons.
How precise is the result?
The answer is rounded to three decimal places, giving you tenths of a run precision that is more than adequate for most analysis.
How can I interpret a negative wRAA?
A negative number means the hitter created fewer runs than an average player given the same number of trips to the plate, while a positive number indicates above-average production.