Performance Rating Distribution Calculator
ANA›Life Services Authority›National Calculator Authority›Performance Rating Distribution Calculator
.calc-container { max-width: 640px; margin: 2rem 0; padding: 1.5rem; background: #fff; border: 1px solid #ddd; border-radius: 8px; box-shadow: 0 1px 3px rgba(0,0,0,0.06); font-family: system-ui, -apple-system, sans-serif; } .calc-container h3 { font-family: Georgia, serif; font-size: 1.15rem; color: #1a1a1a; margin-bottom: 1rem; padding-bottom: 0.5rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-row { display: flex; align-items: center; gap: 0.75rem; margin-bottom: 0.75rem; flex-wrap: wrap; } .calc-row label { min-width: 160px; font-size: 0.9rem; color: #333; font-weight: 500; } .calc-row input[type="number"], .calc-row select { flex: 1; min-width: 120px; max-width: 200px; padding: 0.5rem 0.6rem; border: 1px solid #ccc; border-radius: 4px; font-size: 0.9rem; font-family: system-ui, sans-serif; color: #1a1a1a; background: #fafaf8; } .calc-row input:focus, .calc-row select:focus { outline: none; border-color: var(--ac, #3d5a80); box-shadow: 0 0 0 2px rgba(26,74,138,0.12); } .calc-row .unit { font-size: 0.82rem; color: #888; min-width: 30px; } .calc-btn { display: inline-block; margin-top: 0.5rem; padding: 0.55rem 1.5rem; background: var(--ac, #3d5a80); color: #fff; border: none; border-radius: 4px; font-size: 0.9rem; font-weight: 600; cursor: pointer; font-family: system-ui, sans-serif; } .calc-btn:hover { opacity: 0.9; } .calc-result { margin-top: 1.25rem; padding: 1rem 1.25rem; background: #f0f6fc; border-left: 3px solid var(--ac, #3d5a80); border-radius: 0 6px 6px 0; display: none; } .calc-result.visible { display: block; } .calc-result-label { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.06em; color: #666; margin-bottom: 0.25rem; } .calc-result-value { font-size: 1.6rem; font-weight: 700; color: var(--ac, #3d5a80); } .calc-result-detail { font-size: 0.85rem; color: #555; margin-top: 0.5rem; line-height: 1.5; } .calc-note { margin-top: 1rem; font-size: 0.8rem; color: #888; font-style: italic; } .calc-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; margin-top: 0.75rem; } .calc-grid-item { padding: 0.6rem 0.8rem; background: #f8f9fa; border-radius: 4px; border: 1px solid #eee; } .calc-grid-item .label { font-size: 0.75rem; color: #888; text-transform: uppercase; letter-spacing: 0.04em; } .calc-grid-item .value { font-size: 1.1rem; font-weight: 600; color: #1a1a1a; } @media (max-width: 720px) { .calc-row { flex-direction: column; align-items: flex-start; gap: 0.3rem; } .calc-row label { min-width: auto; } .calc-row input[type="number"], .calc-row select { max-width: 100%; width: 100%; } .calc-grid { grid-template-columns: 1fr; } } .calc-chart { margin: 1rem 0; text-align: center; } .calc-chart svg { max-width: 100%; height: auto; } .calc-chart-legend { display: flex; flex-wrap: wrap; justify-content: center; gap: 0.6rem 1.2rem; margin-top: 0.6rem; font-size: 0.8rem; color: #555; } .calc-chart-legend span { display: inline-flex; align-items: center; gap: 0.3rem; } .calc-chart-legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; font-style: normal; } .calc-related { max-width: 640px; margin: 2rem 0 1rem; padding: 1.25rem 1.5rem; background: #f8f9fa; border: 1px solid #e8e8e8; border-radius: 8px; } .calc-related h3 { font-family: Georgia, serif; font-size: 1rem; color: #1a1a1a; margin: 0 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 2px solid var(--ac, #3d5a80); } .calc-related-list { list-style: none; padding: 0; margin: 0 0 0.75rem; display: grid; grid-template-columns: 1fr 1fr; gap: 0.4rem 1.5rem; } .calc-related-list li a { font-size: 0.88rem; color: var(--ac, #3d5a80); text-decoration: none; } .calc-related-list li a:hover { text-decoration: underline; } .calc-browse-all { margin: 0.5rem 0 0; font-size: 0.9rem; font-weight: 600; } .calc-browse-all a { color: var(--ac, #3d5a80); text-decoration: none; } .calc-browse-all a:hover { text-decoration: underline; } @media (max-width: 720px) { .calc-related-list { grid-template-columns: 1fr; } }
Performance Rating Distribution Calculator
Calculate the expected number of employees in each performance rating category based on total headcount and a distribution model (forced distribution or normal bell curve).
Total Number of Employees
Distribution Model
Forced Distribution (GE/Vitality Curve) Custom Percentages
Preset Curve
GE Vitality Curve (20/70/10) Bell Curve (10/25/30/25/10) Top-Heavy (5/15/30/35/15)
Enter percentage for each rating tier (must sum to 100%):
Rating 1 – Exceptional (%)
Rating 2 – Exceeds Expectations (%)
Rating 3 – Meets Expectations (%)
Rating 4 – Needs Improvement (%)
Rating 5 – Unsatisfactory (%)
Calculate Distribution Results will appear here.
function perToggleModel() { var model = document.getElementById('per-model').value; document.getElementById('per-forced-section').style.display = (model === 'forced') ? 'block' : 'none'; document.getElementById('per-custom-section').style.display = (model === 'custom') ? 'block' : 'none'; }
function perApplyPreset() { // Presets are read at calc time; this is just a UI hook for future extension }
function perGetPresetPercentages(preset) { // Returns array of [label, pct] pairs if (preset === 'ge') { return [ ['Top Performers', 20], ['Core Performers', 70], ['Low Performers', 10] ]; } else if (preset === 'bell') { return [ ['Exceptional (5)', 10], ['Exceeds Expectations (4)', 25], ['Meets Expectations (3)', 30], ['Needs Improvement (2)', 25], ['Unsatisfactory (1)', 10] ]; } else if (preset === 'top') { return [ ['Exceptional (5)', 5], ['Exceeds Expectations (4)', 15], ['Meets Expectations (3)', 30], ['Needs Improvement (2)', 35], ['Unsatisfactory (1)', 15] ]; } return []; }
function perCalc() { var resultDiv = document.getElementById('per-result');
var headcount = parseFloat(document.getElementById('per-headcount').value); if (isNaN(headcount) || headcount Please enter a valid whole number for total employees (minimum 1).'; return; } headcount = Math.round(headcount);
var model = document.getElementById('per-model').value; var tiers = [];
if (model === 'forced') { var preset = document.getElementById('per-preset').value; tiers = perGetPresetPercentages(preset); } else { // Custom model var labels = [ 'Exceptional (Rating 1)', 'Exceeds Expectations (Rating 2)', 'Meets Expectations (Rating 3)', 'Needs Improvement (Rating 4)', 'Unsatisfactory (Rating 5)' ]; var ids = ['per-c1','per-c2','per-c3','per-c4','per-c5']; var total = 0; var valid = true; var pcts = []; for (var i = 0; i 100) { resultDiv.innerHTML = 'Please enter valid percentages (0–100) for all rating tiers.'; return; } pcts.push(v); total += v; } // Allow small floating point tolerance if (Math.abs(total - 100) > 0.5) { resultDiv.innerHTML = 'Custom percentages must sum to 100%. Current sum: ' + total.toFixed(2) + '%.'; return; } for (var j = 0; j ' + '' + '' + tiers[m][0] + '' + '' + tiers[m][1].toFixed(1) + '%' + '' + finalCounts[m] + '' + '' + actualPct + '%' + ''; }
// Bar chart visualization var bars = ''; for (var n = 0; n ' + '' + '' + tiers[n][0] + '' + '' + finalCounts[n] + ' employees (' + barPct + '%)' + '' + '' + '' + '' + ''; }
// Gini-like spread index (std dev of actual vs target pcts) var targetPcts = tiers.map(function(t) { return t[1]; }); var meanTarget = targetPcts.reduce(function(a,b){return a+b;},0) / targetPcts.length; var variance = targetPcts.reduce(function(a,v){return a + Math.pow(v - meanTarget, 2);},0) / targetPcts.length; var spreadIndex = Math.sqrt(variance).toFixed(2);
resultDiv.innerHTML = '### Distribution Results ' + 'Total Employees: ' + headcount + ' | Tiers: ' + tiers.length + ' | Distribution Spread (σ): ' + spreadIndex + '%
' +
'' + bars + '' +
'' + '' + '' + 'Rating Tier' + 'Target %' + 'Employees' + 'Actual %' + '' + '' + '' + rows + '' + '' + '' + 'Total' + '100%' + '' + totalCheck + '' + '100%' + '' + '' + ''; }
#### Formulas Used
Employee Count per Tier:
Raw Counti = (Percentagei / 100) × Total Headcount Floor Counti = ⌊ Raw Counti ⌋ Remainderi = Raw Counti − Floor Counti
Largest-Remainder Rounding ensures all employee counts are whole numbers and sum exactly to total headcount:
Deficit = Headcount − Σ Floor Counti Add 1 to the Deficit tiers with the largest remainders.
Distribution Spread (σ): Standard deviation of target percentages across tiers — measures how evenly or unevenly the model distributes employees.
σ = √[ Σ(pi − p̄)² / n ]
#### Assumptions & References
- GE Vitality Curve (20/70/10): Popularized by Jack Welch at General Electric — top 20% rewarded, middle 70% developed, bottom 10% managed out. (Welch, J., Winning, 2005)
- Bell Curve (10/25/30/25/10): A symmetric normal distribution model commonly used in HR performance management systems.
- Top-Heavy (5/15/30/35/15): A right-skewed model used in organizations that emphasize development over differentiation.
- This calculator assumes a closed system — all employees receive exactly one rating tier.
- Forced distribution models are controversial; research suggests they can reduce collaboration and morale (Scullen et al., Journal of Applied Psychology, 2005).
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