Relief Pitcher Value Estimator: FIP, xFIP, and Save Opportunity Conversion
ANA›Life Services Authority›National Calculator Authority›Relief Pitcher Value Estimator: FIP, xFIP, and Save Opportunity Conversion
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Relief Pitcher Value Estimator: FIP, xFIP, and Save Opportunity Conversion
Evaluate a relief pitcher's true performance using Fielding Independent Pitching (FIP), Expected FIP (xFIP), and Save Opportunity Conversion Rate. These metrics strip out defense and luck to reveal a pitcher's actual skill level.
### Pitching Basics
Innings Pitched (IP)
Earned Runs (ER)
League ERA (for context)
### FIP Components
Home Runs Allowed (HR)
Walks Allowed (BB)
Hit Batters (HBP)
Strikeouts (K)
### xFIP Components
Fly Balls Allowed (FB)
League HR/FB Rate (%)
FIP Constant (cFIP)
### Save Opportunities
Save Opportunities (SVO)
Saves (SV)
Blown Saves (BS)
Calculate Pitcher Value
Fill in the fields above and click Calculate.
function relCalc() { const resultDiv = document.getElementById('rel-result');
// Inputs const ip = parseFloat(document.getElementById('rel-ip').value); const er = parseFloat(document.getElementById('rel-er').value); const lgERA = parseFloat(document.getElementById('rel-era').value); const hr = parseFloat(document.getElementById('rel-hr').value); const bb = parseFloat(document.getElementById('rel-bb').value); const hbp = parseFloat(document.getElementById('rel-hbp').value); const k = parseFloat(document.getElementById('rel-k').value); const fb = parseFloat(document.getElementById('rel-fb').value); const lgHRFB = parseFloat(document.getElementById('rel-lghrfb').value); const cFIP = parseFloat(document.getElementById('rel-fipconstant').value); const svo = parseFloat(document.getElementById('rel-svo').value); const sv = parseFloat(document.getElementById('rel-sv').value); const bs = parseFloat(document.getElementById('rel-bs').value);
// Validation const errors = []; if (isNaN(ip) || ip 100) errors.push("League HR/FB Rate must be between 0 and 100."); if (isNaN(cFIP) || cFIP svo) errors.push("Saves cannot exceed Save Opportunities."); if (!isNaN(bs) && !isNaN(svo) && bs > svo) errors.push("Blown Saves cannot exceed Save Opportunities."); if (!isNaN(sv) && !isNaN(bs) && !isNaN(svo) && (sv + bs) > svo) errors.push("Saves + Blown Saves cannot exceed Save Opportunities.");
if (errors.length > 0) { resultDiv.innerHTML = 'Please fix the following:' + errors.map(e => '').join('') + ''; return; }
// Convert IP to true innings (e.g. 65.1 → 65 + 1/3 = 65.333) const ipWhole = Math.floor(ip); const ipFrac = Math.round((ip - ipWhole) * 10); // outs (0,1,2) const trueIP = ipWhole + ipFrac / 3;
if (trueIP Innings Pitched must result in a positive value (e.g. 0.1 = one out).'; return; }
// ERA const ERA = (er / trueIP) * 9;
// FIP = ((13HR) + (3(BB+HBP)) - (2*K)) / IP + cFIP const FIP = ((13 * hr) + (3 * (bb + hbp)) - (2 * k)) / trueIP + cFIP;
// xFIP: replace actual HR with expected HR based on league HR/FB rate // Expected HR = FB * (lgHRFB / 100) const expHR = fb * (lgHRFB / 100); const xFIP = ((13 * expHR) + (3 * (bb + hbp)) - (2 * k)) / trueIP + cFIP;
// FIP - ERA differential (negative = pitcher outperforms ERA, positive = ERA underestimates true skill) const fipMinusERA = FIP - ERA;
// Save Conversion Rate const svConvRate = svo > 0 ? (sv / svo) * 100 : null;
// Blown Save Rate const bsRate = svo > 0 ? (bs / svo) * 100 : null;
// K/9 const k9 = (k / trueIP) * 9;
// BB/9 const bb9 = (bb / trueIP) * 9;
// K/BB ratio const kbb = bb > 0 ? k / bb : null;
// HR/9 const hr9 = (hr / trueIP) * 9;
// Rating helpers function fipRating(f) { if (f = 90) return {label: "Elite Closer", color: "#27ae60"}; if (r >= 80) return {label: "Reliable Closer", color: "#2ecc71"}; if (r >= 70) return {label: "Average Closer", color: "#f39c12"}; if (r >= 60) return {label: "Below Average", color: "#e74c3c"}; return {label: "Struggling", color: "#c0392b"}; }
const fipR = fipRating(FIP); const xfipR = fipRating(xFIP); const svR = svRating(svConvRate);
// Interpretation of FIP vs ERA let fipEraNote = ""; if (fipMinusERA 0.50) { fipEraNote = "FIP is significantly higher than ERA — pitcher may be getting lucky or benefiting from strong defense. ERA regression likely."; } else { fipEraNote = "FIP and ERA are closely aligned — results appear sustainable."; }
// xFIP vs FIP note let xfipNote = ""; const xfipDiff = xFIP - FIP; if (xfipDiff > 0.30) { xfipNote = "xFIP is higher than FIP — pitcher allowed fewer HR than expected given fly ball rate. Some HR luck may be present."; } else if (xfipDiff
Metric Value Rating
ERA ${ERA.toFixed(2)} ${fipRating(ERA).label}
FIP ${FIP.toFixed(2)} ${fipR.label}
xFIP ${xFIP.toFixed(2)} ${xfipR.label}
FIP − ERA ${fipMinusERA >= 0 ? '+' : ''}${fipMinusERA.toFixed(2)} ${fipMinusERA 0 ? "ERA may fall" : "Stable"}
K/9 ${k9.toFixed(2)} = 10 ? '#27ae60' : k9 >= 8 ? '#f39c12' : '#e74c3c'}">${k9 >= 10 ? 'Elite' : k9 >= 8 ? 'Good' : 'Below Avg'}
BB/9 ${bb9.toFixed(2)} ${bb9
K/BB Ratio ${kbb !== null ? kbb.toFixed(2) : 'N/A'} = 3.5 ? '#27ae60' : kbb !== null && kbb >= 2.0 ? '#f39c12' : '#e74c3c'}">${kbb !== null ? (kbb >= 3.5 ? 'Elite' : kbb >= 2.0 ? 'Average' : 'Poor') : 'N/A'}
HR/9 ${hr9.toFixed(2)} ${hr9
Save Conv. Rate ${svConvRate !== null ? svConvRate.toFixed(1) + '%' : 'N/A'} ${svR.label}
Blown Save Rate ${bsRate !== null ? bsRate.toFixed(1) + '%' : 'N/A'} ${bsRate !== null ? (bsRate
FIP vs ERA: ${fipEraNote}
xFIP vs FIP: ${xfipNote}
`; }
#### Formulas Used
ERA: ERA = (ER / IP) × 9
FIP (Fielding Independent Pitching): FIP = ((13 × HR) + (3 × (BB + HBP)) − (2 × K)) / IP + cFIP where cFIP is the league FIP constant (typically ~3.10, adjusted annually to align FIP with ERA scale).
xFIP (Expected FIP): xFIP = ((13 × (FB × lgHR/FB%)) + (3 × (BB + HBP)) − (2 × K)) / IP + cFIP Replaces actual HR with expected HR based on the pitcher's fly ball rate and the league-average HR/FB rate (~10–11%).
Save Conversion Rate: SV% = (SV / SVO) × 100
Blown Save Rate: BS% = (BS / SVO) × 100
K/9: (K / IP) × 9 | BB/9: (BB / IP) × 9 | HR/9: (HR / IP) × 9
K/BB Ratio: K / BB
Note: IP is converted from baseball notation (e.g. 65.1 = 65⅓ innings) to decimal form for calculations.
#### Assumptions & References
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