Hitter Projection Calculator: wRC+ and Weighted On-Base Average (wOBA)

ANA›Life Services Authority›National Calculator Authority›Hitter Projection Calculator: wRC+ and Weighted On-Base Average (wOBA)

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Hitter Projection Calculator: wRC+ and Weighted On-Base Average (wOBA)

Project a hitter's Weighted On-Base Average (wOBA) and park/league-adjusted Weighted Runs Created Plus (wRC+) using FanGraphs-style linear weights. Enter your hitter's counting stats and league context below.

### Plate Appearance Breakdown

Walks (BB)

Hit By Pitch (HBP)

Singles (1B)

Doubles (2B)

Triples (3B)

Home Runs (HR)

At Bats (AB)

Sacrifice Flies (SF)

Intentional BB (IBB)

### League Context

League wOBA

League OBP

wOBA Scale (R/PA)

League R/PA

Park Factor (100 = neutral)

Calculate wOBA & wRC+ Fill in the fields above and click Calculate.

function hitCalc() { // --- Read inputs --- var bb = parseFloat(document.getElementById('hit-bb').value) || 0; var hbp = parseFloat(document.getElementById('hit-hbp').value) || 0; var s1b = parseFloat(document.getElementById('hit-1b').value) || 0; var d2b = parseFloat(document.getElementById('hit-2b').value) || 0; var t3b = parseFloat(document.getElementById('hit-3b').value) || 0; var hr = parseFloat(document.getElementById('hit-hr').value) || 0; var ab = parseFloat(document.getElementById('hit-ab').value) || 0; var sf = parseFloat(document.getElementById('hit-sf').value) || 0; var ibb = parseFloat(document.getElementById('hit-ibb').value) || 0; var lgWOBA = parseFloat(document.getElementById('hit-lg-woba').value) || 0.320; var lgOBP = parseFloat(document.getElementById('hit-lg-obp').value) || 0.318; var wobaScale = parseFloat(document.getElementById('hit-woba-scale').value) || 1.157; var lgRPA = parseFloat(document.getElementById('hit-lg-r-pa').value) || 0.1150; var parkFactor= parseFloat(document.getElementById('hit-park').value) || 100;

var res = document.getElementById('hit-result');

// --- Validation --- var errors = []; if (ab 0.450) errors.push("League wOBA should be between 0.200 and 0.450."); if (lgOBP 0.450) errors.push("League OBP should be between 0.200 and 0.450."); if (wobaScale 2.0) errors.push("wOBA Scale should be between 1.000 and 2.000."); if (lgRPA 0.20) errors.push("League R/PA should be between 0.05 and 0.20."); if (parkFactor 150) errors.push("Park Factor should be between 50 and 150.");

// Logical cross-checks var hits = s1b + d2b + t3b + hr; var pa = ab + bb + hbp + sf; if (pa ab) errors.push("Total hits cannot exceed At Bats."); if (ibb > bb) errors.push("Intentional BB cannot exceed total Walks.");

if (errors.length > 0) { res.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }

// --- FanGraphs 2023 linear weights (standard season) --- // Source: FanGraphs guts page (approximate 2022-2023 values) var w_bb = 0.690; var w_hbp = 0.722; var w_1b = 0.888; var w_2b = 1.271; var w_3b = 1.616; var w_hr = 2.101;

// --- wOBA numerator --- var woba_num = (w_bb * (bb - ibb)) + (w_hbp * hbp) + (w_1b * s1b) + (w_2b * d2b) + (w_3b * t3b) + (w_hr * hr);

// --- wOBA denominator: AB + BB - IBB + SF + HBP --- var woba_den = ab + (bb - ibb) + sf + hbp;

if (woba_den Denominator for wOBA is zero. Check your inputs.'; return; }

var woba = woba_num / woba_den;

// --- wRAA (Weighted Runs Above Average) --- // wRAA = ((wOBA - lgwOBA) / wOBAScale) * PA var wraa = ((woba - lgWOBA) / wobaScale) * pa;

// --- wRC (Weighted Runs Created) --- // wRC = wRAA + (lgR/PA * PA) var wrc = wraa + (lgRPA * pa);

// --- wRC+ --- // wRC+ = ( (wRAA/PA + lgR/PA) + (lgR/PA - PF * lgR/PA) ) / lgR/PA * 100 // Simplified: wRC+ = 100 * ( (wOBA - lgwOBA)/wOBAScale + lgR/PA ) / (lgR/PA * PF/100) var pf = parkFactor / 100.0; var wrcPlus = 100 * ( ((woba - lgWOBA) / wobaScale) + lgRPA ) / (lgRPA * pf);

// --- OBP for reference --- var obp = (hits + bb + hbp) / (ab + bb + hbp + sf);

// --- Slugging --- var slg = (s1b + 2d2b + 3t3b + 4*hr) / ab;

// --- OPS --- var ops = obp + slg;

// --- Rating labels --- function wobaRating(w) { if (w >= 0.400) return "Elite"; if (w >= 0.370) return "Great"; if (w >= 0.340) return "Above Average"; if (w >= 0.310) return "Average"; if (w >= 0.280) return "Below Average"; if (w >= 0.250) return "Poor"; return "Very Poor"; } function wrcPlusRating(w) { if (w >= 160) return "Elite"; if (w >= 140) return "Great"; if (w >= 115) return "Above Average"; if (w >= 95) return "Average"; if (w >= 80) return "Below Average"; if (w >= 65) return "Poor"; return "Very Poor"; }

var wobaR = wobaRating(woba); var wrcPlusR = wrcPlusRating(wrcPlus);

res.innerHTML = '### Results ' + '' + 'MetricValueRating' + 'wOBA' + woba.toFixed(3) + '' + wobaR + '' + 'wRC+' + wrcPlus.toFixed(1) + '' + wrcPlusR + '' + 'wRAA' + wraa.toFixed(1) + ' runs' + 'wRC' + wrc.toFixed(1) + ' runs' + 'OBP' + obp.toFixed(3) + '' + 'SLG' + slg.toFixed(3) + '' + 'OPS' + ops.toFixed(3) + '' + 'Plate Appearances' + pa.toFixed(0) + '' + ''; }

#### Formulas Used

wOBA (Weighted On-Base Average):

wOBA = (0.690×uBB + 0.722×HBP + 0.888×1B + 1.271×2B + 1.616×3B + 2.101×HR) ───────────────────────────────────────────────────────────────────────── AB + uBB + SF + HBP

where uBB = BB − IBB (unintentional walks)

wRAA (Weighted Runs Above Average):

wRAA = ((wOBA − lgwOBA) / wOBAScale) × PA

wRC (Weighted Runs Created):

wRC = wRAA + (lgR/PA × PA)

wRC+ (Park & League Adjusted):

wRC+ = 100 × [ ((wOBA − lgwOBA) / wOBAScale) + lgR/PA ] ───────────────────────────────────────── lgR/PA × ParkFactor

wRC+ = 100 means exactly league average. Every point above/below 100 is one percentage point better/worse than league average, park-adjusted.

#### Assumptions & References

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