Calculations follow commonly used HSE practices. Always confirm with your organization’s definitions and local regulations. References: OSHA 1904, ISO 45001, ILO OSH.
Project Inputs
Fill details, apply a template, preview, and export to PDF.
Project / Site Details
Workforce & Days
| Category / Crew | # Workers/Day | Days Worked | Shifts/Day | Remove |
|---|
Man-Days = # Workers/Day × Days Worked × Shifts/Day
Templates
Templates auto-fill project info + workforce rows.
Notes & Carry-Over
Actions
Use Shifts/Day > 1 for day+night operations.
Man-Days Worked Report
Generated preview — review and export to PDF
Generated On
Project / Site: —
Client: —
Location: —
Period: —
Report Type: Man-Days Worked
Workforce & Man-Days Summary
| Category / Crew | # Workers/Day | Days Worked | Shifts/Day | Man-Days |
|---|---|---|---|---|
| Subtotal (This Period) | 0 | |||
Man-Days (This Period)
0
Carry-Over (Before Period)
0
Cumulative Man-Days
0
Milestones
Highlights / Remarks
—
👷♂️ Man-Days Worked Calculator – Complete Guide
Tracking man-days (and optional man-hours) is a cornerstone of HSE and project reporting. Accurate figures drive productivity metrics, cost control, and lagging/leading safety indicators (e.g., TRIR per 200k hours). This Man-Days Worked Calculator helps you compute headcount totals, man-days, and (if set) man-hours—then export a clean A4 PDF for records and audits.
✅ What Is a Man-Days Worked Calculator?
A simple, structured tool that converts crew numbers and working days into report-ready totals. It avoids spreadsheet errors, standardizes the method, and produces a tidy PDF attachment for daily/weekly HSE reports.
It typically includes:
- Crew inputs (Skilled, Unskilled, Contract).
- Period inputs (Days) and optional Hours/Day.
- Auto-computed Headcount, Man-Days, Man-Hours.
- PDF export for documentation.
Note: Some clients define man-hours differently (e.g., exclude overtime). Always follow your contract/HSE procedure.
🧮 Core Formulas (Standard)
- Headcount = Skilled + Unskilled + Contract
- Man-Days = Headcount × Days
- Man-Hours = Man-Days × Hours/Day (optional—only if you provide Hours/Day)
If your site uses a different basis (e.g., per shift or excludes certain categories), customize inputs accordingly.
📋 Key Components of the Calculator
- Inputs
- Skilled, Unskilled, Contract (whole numbers ≥ 0)
- Days (≥ 1)
- Hours/Day (optional; whole or decimal, e.g., 8 or 8.5)
- Project/Site (optional tag for the PDF)
- Outputs
- Crew tiles (Skilled, Unskilled, Contract, Headcount)
- Period & totals (Days, Man-Days, Man-Hours)
- Notes about how hours were computed
- Actions
- Calculate → updates results live
- Download PDF → tidy A4 report (great for email to client/PM/HSE)
- Reset → clears inputs & outputs
- Validation
- Ensures numeric fields are valid (e.g., Days ≥ 1, non-negative integers for crew)
- Hours/Day can be blank (then man-hours are not calculated)
🛠 How to Use the Man-Days Worked Calculator
- Enter Crew Counts — Skilled, Unskilled, Contract.
- Set Period Days — e.g., 26 for a 26-day month segment.
- (Optional) Hours/Day — e.g., 8 (or 10 for shutdowns). Leave blank to skip man-hours.
- Click Calculate — view Headcount, Man-Days, and Man-Hours (if Hours/Day provided).
- Download PDF — archive with your HSE pack / send to the client.
- Reset — clear inputs for the next period/site.
Tip: Keep Hours/Day at your standard (often 8) and track overtime separately in your daily safety report.
🧑🏫 Worked Examples
Example 1 – Construction Project (Standard 8-hour day)
- Skilled = 45, Unskilled = 60, Contract = 20 → Headcount = 125
- Days = 26 → Man-Days = 125 × 26 = 3,250
- Hours/Day = 8 → Man-Hours = 3,250 × 8 = 26,000
Example 2 – Shutdown (10-hour day)
- Skilled = 80, Unskilled = 120, Contract = 50 → Headcount = 250
- Days = 12 → Man-Days = 3,000
- Hours/Day = 10 → Man-Hours = 30,000
Example 3 – Training Day (Count but no hours)
- Skilled = 20, Unskilled = 0, Contract = 0 → Headcount = 20
- Days = 1 → Man-Days = 20
- Hours/Day left blank → Man-Hours = — (not computed)
📌 Why This Matters for HSE & PMO
- Accurate KPIs → TRIR, LTIFR, and productivity metrics rely on correct hours.
- Budget & Cost Control → Man-hours drive labor cost and variance analysis.
- Audit Readiness → PDF output serves as a quick record for client/ISO audits.
- Consistency → Standardizes calculations across sites/contractors.
🔍 Common Pitfalls (and Fixes)
- Counting Absentees: Make sure crew numbers reflect actual presence, not roster.
- Double-Counting Contractors: Confirm your definition (external vs. included in skilled/unskilled).
- Inflated Hours: Don’t multiply by OT unless that’s your site’s official convention.
- Missing Days Validation: The tool enforces Days ≥ 1 to avoid zeros.
🌟 Best Practices
- Align Hours/Day with your HSE manual (e.g., 8 hr standard + OT in separate line).
- Use the Project/Site field to label your PDF per location or client.
- Attach the PDF to your Daily Safety Report or Weekly KPI Pack.
- Keep a consistent approach month-to-month for trend reliability.
❓ Frequently Asked Questions
Can I leave Hours/Day blank?
Yes. The tool will compute Man-Days and skip Man-Hours.
Do visitors count?
Typically no—unless they’re working hours under your scope. Follow your HSE procedure.
Can I export multiple sites?
Generate a separate PDF per site/period for clean traceability.
Do absentees get counted in crew totals?
No—use actual present headcount for the period.
Are contractors counted separately from skilled/unskilled?
Use your site convention. Either list contractors separately or include them in skilled/unskilled—just be consistent.
🎯 Final Thoughts
The Man-Days Worked Calculator brings clarity to crew reporting, reduces human error, and produces audit-friendly PDFs in seconds. Use it alongside your Daily Safety Report and Toolbox Talk/Training records for a complete, defensible HSE dossier.
Next up: pair this with your Daily Safety Report Generator to keep headcount, activities, and hours consistent across all reports.
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