An all-in-one tool for calculating baseball pitching stats. Results can be printed.
Pitcher Stat Calculator
How to Use This Pitching Stat Calculator
These are the input fields used for this pitching stat calculator:
- Name (Optional): Enter the pitcher’s name if desired. This is mainly in case you wish to print results.
- Innings Pitched (IP): Input innings pitched, including fractional innings (e.g., 7.1 for seven innings and one out).
- Batters Faced (BF): Enter the total number of batters faced.
- Total Hits (H): Input the number of hits allowed.
- Strikeouts (SO): Enter the total strikeouts recorded.
- Walks (BB): Input the number of walks allowed.
- Hit by Pitch (HBP): Enter the number of batters hit by a pitch.
- Sacrifices (SF, SH): Enter the total number of sacrifice hits and sacrifice flies.
- Catcher Interference (CI): Enter any instances of catcher interference.
- Earned Runs (ER): Input the number of earned runs allowed.
If you do not know total sacrifices and catcher interference, just input 0 for those fields. Just remember that 0 for those will slightly affect the results for Batting Average Against and On-Base Percentage Against.
After you have entered all of you pitching statistics, click “Calculate Stats” to see the output. There is also a Print button in case you want to print the results for stat keeping purposes. The stats you input will save even on page refresh (you will need to hit Reset to clear stats).
These are the pitching statistics that this calculator is designed to output:
- Earned Run Average (ERA)
- Walks and Hits per Inning Pitched (WHIP)
- Hits per Nine Innings (H/9)
- Strikeouts per Nine Innings (K/9)
- Walks per Nine Innings (BB/9)
- Strikeout-to-Walk Ratio (K/BB)
- Batting Average Against (BAA)
- On-Base Percentage Against (OBP Against)
- Batting Average on Balls in Play (BABIP)
- Hit by Pitch per Nine Innings (HBP/9)
- ERA/7 and K/7 for High School
This tool is used for tracking pitcher stats using season-long data. If you want to track pitcher stats during a game, visit our in-game pitcher stat tracker.
Calculating Pitching Stats & Why They Matter
Earned Run Average (ERA)
Calculating Earned Run Average (ERA) measures the number of earned runs a pitcher allows per nine innings pitched. The formula takes the total earned runs given up by the pitcher, multiplies it by nine, and divides it by the innings pitched.
A lower ERA indicates that a pitcher is effective at preventing runs, making it one of the most commonly referenced pitching stats. However, while ERA provides a strong measure of a pitcher’s ability to prevent scoring, it is best evaluated alongside other metrics to better gauge the value of a pitcher.
At the pro level, advanced metrics like FIP and SIERA (and others) will be used to get a better idea of the true value of a pitcher. At the high school baseball level, these league-adjusted and weighted metrics are not as available.
To balance ERA in high school, you can use pitcher stats like WHIP and Batting Average Against (BAA). WHIP gives insight into how often a pitcher allows baserunners, while BAA shows how often batters record hits against them.
Walks and Hits per Inning Pitched (WHIP)
As we just discussed above, WHIP calculates how many walks and hits a pitcher allows per inning pitched. The formula adds total walks and hits allowed and divides by innings pitched. A lower WHIP suggests that a pitcher consistently keeps runners off base, which directly impacts run prevention.
WHIP is best evaluated alongside ERA and other statistics. A pitcher with a low WHIP and low ERA is likely dominant, but if their WHIP is low while their ERA remains higher, it may indicate that they allow less baserunners but the base hits they do give up tend to be extra base hits.
Hits per Nine Innings (H/9)
Hits per Nine Innings (H/9) calculates how many hits a pitcher allows per nine innings. It is derived by multiplying total hits allowed by nine and dividing by innings pitched. This stat isolates how often opposing batters successfully put the ball in play for a hit, without including walks or hit-by-pitches.
While H/9 helps measure a pitcher’s ability to limit hits, it should be examined alongside BABIP (Batting Average on Balls in Play) and WHIP. A high BABIP and low H/9 might indicate bad luck, where balls are finding gaps despite weak contact. A lower H/9 with an elevated WHIP means a pitcher is struggling with walks.
Strikeouts per Nine Innings (K/9)
Strikeouts per Nine Innings (K/9) represents how many batters a pitcher strikes out in a nine-inning span. It is calculated by multiplying total strikeouts by nine and dividing by innings pitched. High strikeout numbers indicate a pitcher’s ability to miss bats and prevent balls from being put in play, reducing reliance on fielders.
K/9 is most useful when considered with Walks per Nine Innings (BB/9) and ultimately their Strikeout-to-Walk Ratio (K/BB). A pitcher with a high K/9 but also a high BB/9 might be overpowering but inefficient, while a high K/9 with a low BB/9 indicates strong command and likely dominance.
Walks per Nine Innings (BB/9)
Walks per Nine Innings (BB/9) tracks how many walks a pitcher allows per nine innings. It is determined by multiplying total walks by nine and dividing by innings pitched. A lower BB/9 indicates better command and fewer free baserunners given up.
To get a full picture of pitching effectiveness, BB/9 should be balanced with WHIP and Strikeout-to-Walk Ratio (K/BB). A low BB/9 but high WHIP may suggest that a pitcher avoids walks but allows too many hits, while a low BB/9 and high K/BB indicate strong control and efficiency.
Strikeout-to-Walk Ratio (K/BB)
As we have discussed above, Strikeout-to-Walk Ratio (K/BB) measures how many strikeouts a pitcher records for every walk issued. It is calculated by dividing total strikeouts by total walks. A higher ratio suggests that a pitcher has strong command and can overpower hitters while limiting free passes.
K/BB works best when still balanced against K/9 numbers. For example, a pitcher might have a strong K/BB ratio, but that might be because they have extremely low walk rates, so even mediocre strikeout rates would produce a high K/BB. Dominant pitchers will have a strong K/BB ratio and a strong K/9.
Batting Average Against (BAA)
Batting Average Against (BAA) calculates the success rate of opposing hitters against a pitcher. It is determined by dividing hits allowed by at-bats against (which excludes walks, hit-by-pitches, sacrifices, and catcher interference). A lower BAA means opposing batters struggle to get hits off the pitcher.
While BAA is a strong indicator of dominance, it should be balanced with WHIP and BABIP. A low BAA with a high WHIP suggests that the pitcher avoids hits but allows too many walks. A low BAA and low BABIP together indicate that a pitcher limits both contact and quality of contact, making them extremely effective.
On-Base Percentage Against (OBP Against)
On-Base Percentage Against (OBP Against) measures how often opposing batters reach base against a pitcher, factoring in hits, walks, and hit-by-pitches. It is calculated by dividing total times reaching base by total plate appearances (excluding sacrifices and catcher interference). A lower OBP Against suggests that a pitcher consistently prevents baserunners.
OBP Against is best evaluated with ERA. A low OBP Against and high ERA suggests that, despite limiting total number of baserunners, the pitcher is allowing a higher number of extra base hits.
Batting Average on Balls in Play (BABIP)
BABIP calculates how often balls put in play go for hits. The formula divides hits (excluding home runs) by the total balls in play (excluding strikeouts, walks, hit-by-pitches, and sacrifices). A higher BABIP suggests that a pitcher is allowing a high percentage of balls in play to become hits, which can indicate bad luck, poor defense, or weak pitching.
BABIP is best examined with H/9 and WHIP. A high BABIP and low H/9 usually indicates unlucky results, while a low BABIP with a low H/9 suggests that the pitcher consistently limits quality contact. At the pro level, BABIP is balanced against metrics such as hard hit rate, line drive rate, and exit velocity to determine the value of a pitcher.
ERA per Seven Innings (ERA/7 – HS)
In this pitching stat calculator, I also included both ERA/7 and K/7 for high school stat keeping purposes. Obviously, due to the length of the game, these rates will be a bit different than different that traditional ERA and K/9.