Roster Positional Scarcity Calculator
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Roster Positional Scarcity Calculator
Determine which positions are most scarce in your fantasy league by calculating the scarcity score — the ratio of starter production to replacement-level production. Higher scores indicate greater positional scarcity and more draft value.
Average Starter Points (top starters avg)
Replacement Level Points (next tier avg)
Number of Teams in League
Starters Per Team at This Position
Total Viable Players at Position (in player pool)
League Scoring Format
Standard (1x) Half-PPR (1.5x) Full PPR (2x)
Calculate Scarcity
Results will appear here.
function rosCalc() { var starterAvg = parseFloat(document.getElementById('ros-starter-avg').value); var replacementAvg = parseFloat(document.getElementById('ros-replacement-avg').value); var numTeams = parseInt(document.getElementById('ros-num-teams').value); var startersPerTeam= parseInt(document.getElementById('ros-starters-per-team').value); var totalPlayers = parseInt(document.getElementById('ros-total-players').value); var scoringMult = parseFloat(document.getElementById('ros-league-scoring').value);
var errors = [];
if (isNaN(starterAvg) || starterAvg = starterAvg) errors.push("Replacement Level Points must be less than Average Starter Points for meaningful scarcity."); if (isNaN(numTeams) || numTeams 32) errors.push("Number of Teams must be between 2 and 32."); if (isNaN(startersPerTeam) || startersPerTeam 10) errors.push("Starters Per Team must be between 1 and 10."); if (isNaN(totalPlayers) || totalPlayers 0) { resultDiv.innerHTML = 'Please fix the following:' + errors.map(function(e){ return ''; }).join('') + ''; return; }
// --- Core Calculations ---
// Total starter slots needed across the league var totalStarterSlots = numTeams * startersPerTeam;
// Scarcity Ratio: starter avg / replacement avg // Higher ratio = more scarce position var scarcityRatio = starterAvg / replacementAvg;
// Value Over Replacement Player (VORP) per starter // VORP = (Starter Avg - Replacement Avg) * Scoring Multiplier var vorp = (starterAvg - replacementAvg) * scoringMult;
// Supply Scarcity Index: ratio of starter slots to total viable players // Closer to 1.0 = very scarce; closer to 0 = abundant var supplyScarcityIndex = totalStarterSlots / totalPlayers;
// Positional Scarcity Score (PSS): // PSS = Scarcity Ratio * Supply Scarcity Index * 100 // Combines production drop-off with supply tightness var pss = scarcityRatio * supplyScarcityIndex * 100;
// Adjusted VORP (accounts for supply scarcity) // Adjusted VORP = VORP * Supply Scarcity Index var adjustedVorp = vorp * supplyScarcityIndex;
// Surplus players beyond starter slots var surplusPlayers = totalPlayers - totalStarterSlots;
// Scarcity tier classification var tier, tierColor; if (pss >= 80) { tier = "Extreme Scarcity — Draft Early"; tierColor = "#c0392b"; } else if (pss >= 55) { tier = "High Scarcity — Prioritize"; tierColor = "#e67e22"; } else if (pss >= 35) { tier = "Moderate Scarcity — Monitor"; tierColor = "#f39c12"; } else if (pss >= 20) { tier = "Low Scarcity — Wait"; tierColor = "#27ae60"; } else { tier = "Abundant — No Rush"; tierColor = "#2980b9"; }
resultDiv.innerHTML = '### Positional Scarcity Results ' + '' + 'Total Starter Slots (League-Wide)' + '' + totalStarterSlots + '' + 'Surplus Players Beyond Starters' + '' + surplusPlayers + '' + 'Scarcity Ratio (Starter / Replacement)' + '' + scarcityRatio.toFixed(3) + '' + 'Supply Scarcity Index' + '' + (supplyScarcityIndex * 100).toFixed(1) + '%' + 'VORP (Value Over Replacement)' + '' + vorp.toFixed(2) + ' pts' + 'Adjusted VORP (Supply-Weighted)' + '' + adjustedVorp.toFixed(2) + ' pts' + 'Positional Scarcity Score (PSS)' + '' + pss.toFixed(1) + '' + 'Scarcity Tier' + '' + tier + '' + '' + 'A PSS above 55 suggests this position should be targeted earlier in your draft. VORP reflects the per-player advantage of rostering a starter over a replacement-level player.
'; }
#### Formulas Used
Total Starter Slots = Number of Teams × Starters Per Team
Scarcity Ratio = Average Starter Points ÷ Replacement Level Points
Supply Scarcity Index = Total Starter Slots ÷ Total Viable Players (ranges 0–1; values near 1 indicate very tight supply)
VORP = (Average Starter Points − Replacement Level Points) × Scoring Multiplier
Adjusted VORP = VORP × Supply Scarcity Index
Positional Scarcity Score (PSS) = Scarcity Ratio × Supply Scarcity Index × 100
Surplus Players = Total Viable Players − Total Starter Slots
#### Assumptions & References
- VORP methodology is widely used in fantasy sports analysis; see Fantasy Pros, Rotoviz, and academic sports analytics literature (e.g., Beuoy, 2014).
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