Runs Created Calculator & Formula
In 1982, the baseball statistician Bill James developed the Runs Created sabermetric, abbreviated RC. Runs created is just what its name indicates, the number of runs that a player creates for his team, whether by direct or indirect action. It is a useful metric to compare with other batting metrics such as slugging percentage, on-base percentage, batting average, and extrapolated runs.
Basic FormulaThere are several formulas for computing RC depending on how many variables you want to consider. The simplest version of the formula is
RC = TB(H + BB)/(AB + BB),
where TB is total bases, BB is bases on balls (walks), H is hits, and AB is at-bats. This formula multiplies the total bases achieved by an on-base factor (H + BB) and then divides by an opportunity factor (AB + BB).
If TB is not given in the stats tables, it can be computed with the formula
TB = H + 2B + 2*3B + 3*HR
Alternate Version: Stolen BasesAnother version of RC takes into account the number of stolen bases, which creates a more realistic metric of a players ability to create runs:
RC = (H + BB - CS)(TB + 0.55*SB)/(AB + BB).
In this formula, CS is caught stealing and SB is stolen bases. This is the RC formula programmed into the calculator above.
Technical RefinementsJames later created 14 more technical RC formulas that take into account all of the available offensive stats. These RC equations are known as Tech-1, Tech-2, etc. and each is applied to a particular period in American League and National League Baseball. Tech-1 can be applied to any year; its formula is
Here, HBP is hits by pitch, GIDP is grounded into double play, IBB is intentional bases on balls, SF is sacrifice flies, and SH is sacrifice hits.
Example Calculation: A player's stats for one season are
1B = 55
2B = 20
3B = 5
HR = 40
(H = 120)
(TB = 270)
AB = 400
BB = 100
SB = 15
CS = 5
If we compute his runs created with the second formula, we have
RC = (120 + 100 - 5)(270 + 0.55*15)/(400 + 100)
= 120 (rounded to nearest whole number)
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