How do I install the Sabermetrics Calc skill?

Run npx skillmds@latest add ahump20/sabermetrics-calc in your terminal (requires Node.js), paste this page's agent-chat prompt into Claude, Cursor, or any MCP-connected agent, or download the SKILL.md file and copy it into your agent's skills directory.

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Which AI agents work with Sabermetrics Calc?

This skill is tagged as working with Claude Code, Claude.ai, OpenAI Codex. SKILL.md is an open format, so most agents that read a skills directory can load it too.

Is Sabermetrics Calc free to use?

Yes. Installing skills from SkillMD is free, and the skill stays under its author's original license.

Who published Sabermetrics Calc?

ahump20 (@ahump20) published this skill. Their other Agent Skills are listed on their SkillMD profile.

Sabermetrics Calc by ahump20 — Agent Skill

Name: Sabermetrics Calc
Author: ahump20

Sabermetrics Calc

This skill should be used when the user asks about sabermetric formulas, "what is wOBA", "how to calculate FIP", "explain wRC+", college baseball advanced stats, or wants to compute sabermetric values from raw stats. Provides formulas, explanations, and calculations for all major sabermetric metrics.

ahump20 Updated Sep 17, 2026

File contents

Sabermetrics Calculator

Calculates, explains, and applies advanced sabermetric formulas for college baseball analytics.

When This Skill Applies

This skill activates when the user:

Asks what a sabermetric stat means (wOBA, FIP, wRC+, BABIP, etc.)
Wants to calculate a metric from raw stats
Needs to evaluate a player using advanced metrics
Compares traditional stats vs. sabermetrics
Asks about college baseball analytics methodology

Core Formulas

wOBA (Weighted On-Base Average)

wOBA = (0.69×uBB + 0.72×HBP + 0.89×1B + 1.27×2B + 1.62×3B + 2.10×HR) / (AB + BB - IBB + SF + HBP)

League average: ~.320
Excellent: >.400
NCAA weights may vary slightly from MLB — adjust for college run environment

FIP (Fielding Independent Pitching)

FIP = ((13×HR) + (3×(BB+HBP)) - (2×K)) / IP + FIP_constant

FIP constant ≈ 3.10 (adjusts to league ERA each season)
College FIP constant recalculated per season for NCAA environment

wRC+ (Weighted Runs Created Plus)

wRC+ = (((wRAA/PA + league_runs_per_PA) + (league_runs_per_PA - park_factor × league_runs_per_PA)) / (league_wRC/PA)) × 100

100 = league average
150+ = elite
College: park factors vary significantly — use with context

BABIP (Batting Average on Balls in Play)

BABIP = (H - HR) / (AB - K - HR + SF)

League average: ~.300
Significant deviation may indicate luck, defense quality, or batted-ball skill

ISO (Isolated Power)

ISO = SLG - AVG

Or equivalently: (2B + 2×3B + 3×HR) / AB

Barrel Rate

Barrel% = Barrels / Batted Ball Events × 100

A barrel: exit velocity ≥ 98 mph and optimal launch angle (26-30° at 98 mph, wider range at higher velo)

CSW% (Called Strike + Whiff %)

CSW% = (Called Strikes + Whiffs) / Total Pitches × 100

Average: ~28-29%
Elite: >32%

Instructions

When this skill is invoked:

Identify which metric(s) the user is asking about
Provide the formula with clear variable definitions
If raw stats are given, compute the result
Contextualize the result (what's good, average, elite in college baseball)
Note any college-specific adjustments vs. MLB formulas

College Baseball Context

College baseball uses aluminum bats (BBCOR since 2011) — higher BABIP and offensive levels than MLB
Smaller sample sizes per season (~56 games vs. 162) — more variance in rate stats
Park factors vary wildly between programs
Pitcher workload limits differ from pro ball
wOBA weights should be recalibrated for the college run environment

---name: sabermetrics-calcdescription: This skill should be used when the user asks about sabermetric formulas, "what is wOBA", "how to calculate FIP", "explain wRC+", college baseball advanced stats, or wants to compute sabermetric values from raw stats. Provides formulas, explanations, and calculations for all major sabermetric metrics.---# Sabermetrics CalculatorCalculates, explains, and applies advanced sabermetric formulas for college baseball analytics.## When This Skill AppliesThis skill activates when the user:- Asks what a sabermetric stat means (wOBA, FIP, wRC+, BABIP, etc.)- Wants to calculate a metric from raw stats- Needs to evaluate a player using advanced metrics- Compares traditional stats vs. sabermetrics- Asks about college baseball analytics methodology## Core Formulas### wOBA (Weighted On-Base Average)```wOBA = (0.69×uBB + 0.72×HBP + 0.89×1B + 1.27×2B + 1.62×3B + 2.10×HR) / (AB + BB - IBB + SF + HBP)```- League average: ~.320- Excellent: >.400- NCAA weights may vary slightly from MLB — adjust for college run environment### FIP (Fielding Independent Pitching)```FIP = ((13×HR) + (3×(BB+HBP)) - (2×K)) / IP + FIP_constant```- FIP constant ≈ 3.10 (adjusts to league ERA each season)- College FIP constant recalculated per season for NCAA environment### wRC+ (Weighted Runs Created Plus)```wRC+ = (((wRAA/PA + league_runs_per_PA) + (league_runs_per_PA - park_factor × league_runs_per_PA)) / (league_wRC/PA)) × 100```- 100 = league average- 150+ = elite- College: park factors vary significantly — use with context### BABIP (Batting Average on Balls in Play)```BABIP = (H - HR) / (AB - K - HR + SF)```- League average: ~.300- Significant deviation may indicate luck, defense quality, or batted-ball skill### ISO (Isolated Power)```ISO = SLG - AVG```- Or equivalently: (2B + 2×3B + 3×HR) / AB### Barrel Rate```Barrel% = Barrels / Batted Ball Events × 100```- A barrel: exit velocity ≥ 98 mph and optimal launch angle (26-30° at 98 mph, wider range at higher velo)### CSW% (Called Strike + Whiff %)```CSW% = (Called Strikes + Whiffs) / Total Pitches × 100```- Average: ~28-29%- Elite: >32%## InstructionsWhen this skill is invoked:1. Identify which metric(s) the user is asking about2. Provide the formula with clear variable definitions3. If raw stats are given, compute the result4. Contextualize the result (what's good, average, elite in college baseball)5. Note any college-specific adjustments vs. MLB formulas## College Baseball Context- College baseball uses aluminum bats (BBCOR since 2011) — higher BABIP and offensive levels than MLB- Smaller sample sizes per season (~56 games vs. 162) — more variance in rate stats- Park factors vary wildly between programs- Pitcher workload limits differ from pro ball- wOBA weights should be recalibrated for the college run environment

Frequently asked questions