Project Timeline & Labor Hours Estimator
ANA›Life Services Authority›National Calculator Authority›Project Timeline & Labor Hours Estimator
.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; } }
Project Timeline & Labor Hours Estimator
Estimate total labor hours and project duration based on task scope, crew size, daily work hours, and productivity factors.
Total Scope of Work (units, sq ft, linear ft, etc.)
Productivity Rate (units per labor-hour)
Crew Size (number of workers)
Work Hours per Day (per worker)
Crew Efficiency Factor (0.50 – 1.00)
Contingency Buffer (%)
Calculate
### Results
Base Labor Hours Required Adjusted Labor Hours (with efficiency) Total Labor Hours (with contingency) Crew-Hours Available per Day Estimated Project Duration Duration with Contingency
function proCalc() { var errEl = document.getElementById('pro-error'); var resEl = document.getElementById('pro-result'); errEl.style.display = 'none'; resEl.style.display = 'none';
var scope = parseFloat(document.getElementById('pro-scope').value); var productivity= parseFloat(document.getElementById('pro-productivity').value); var crew = parseFloat(document.getElementById('pro-crew').value); var hoursDay = parseFloat(document.getElementById('pro-hours').value); var efficiency = parseFloat(document.getElementById('pro-efficiency').value); var contingency = parseFloat(document.getElementById('pro-contingency').value);
// --- Validation --- var errors = []; if (isNaN(scope) || scope 24) errors.push("Work hours per day must be between 1 and 24."); if (isNaN(efficiency) || efficiency 1.00) errors.push("Efficiency factor must be between 0.50 and 1.00."); if (isNaN(contingency) || contingency 100) errors.push("Contingency buffer must be between 0% and 100%.");
if (errors.length > 0) { errEl.innerHTML = errors.join(''); errEl.style.display = 'block'; return; }
// --- Core Formulas --- // Base labor hours = Scope / Productivity Rate var baseHours = scope / productivity;
// Adjusted labor hours = Base Hours / Efficiency Factor // (lower efficiency → more hours needed) var adjHours = baseHours / efficiency;
// Total labor hours with contingency buffer var totalHours = adjHours * (1 + contingency / 100);
// Crew-hours available per calendar day var crewHoursPerDay = crew * hoursDay;
// Project duration in days (base, no contingency) var durationBase = adjHours / crewHoursPerDay;
// Project duration with contingency var durationCont = totalHours / crewHoursPerDay;
// --- Format helpers --- function fmtHours(h) { return h.toFixed(1) + ' hrs'; } function fmtDays(d) { var days = Math.ceil(d); var weeks = (d / 5).toFixed(1); return days + ' working days (~' + weeks + ' weeks)'; }
// --- Populate results --- document.getElementById('pro-base-hours').textContent = fmtHours(baseHours); document.getElementById('pro-adj-hours').textContent = fmtHours(adjHours); document.getElementById('pro-total-hours').textContent = fmtHours(totalHours); document.getElementById('pro-crew-day').textContent = fmtHours(crewHoursPerDay); document.getElementById('pro-duration').textContent = fmtDays(durationBase); document.getElementById('pro-duration-cont').textContent= fmtDays(durationCont);
// Advisory note var note = ''; if (efficiency = 20) { note = '📋 High contingency buffer applied. This may indicate significant project uncertainty or risk.'; } else { note = '✅ Estimates look reasonable. Always validate productivity rates against historical project data.'; } document.getElementById('pro-note').innerHTML = note;
resEl.style.display = 'block'; }
#### Formulas Used
Base Labor Hours = Scope of Work ÷ Productivity Rate
Adjusted Labor Hours = Base Labor Hours ÷ Efficiency Factor
Total Labor Hours = Adjusted Labor Hours × (1 + Contingency % ÷ 100)
Crew-Hours per Day = Crew Size × Work Hours per Day
Project Duration (days) = Adjusted Labor Hours ÷ Crew-Hours per Day
Duration with Contingency = Total Labor Hours ÷ Crew-Hours per Day
#### Assumptions & References
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