Right-size lockers for crews, trades, and staff. Adjust shifts, percent changing, and shared lockers easily. See results instantly above the form after submit today.
| Scenario | Total workers | Peak occupancy | Need lockers | Share | Contingency | Recommended lockers |
|---|---|---|---|---|---|---|
| General trade mix | 120 | 70% | 85% | 1.0 | 10% | 79 |
| High turnover shift work | 180 | 60% | 90% | 1.5 | 15% | 75 |
| Small site with sharing | 45 | 80% | 70% | 1.3 | 10% | 20 |
1) Peak workers = Total Workers × (Peak Occupancy % ÷ 100)
2) Users needing lockers = Peak Workers × (Need Lockers % ÷ 100)
3) Base lockers = Users needing lockers ÷ Workers per locker
4) Recommended lockers = Base lockers × (1 + Contingency % ÷ 100), then rounded
5) Area estimate = Lockers × (Width × Depth) × (1 + Circulation %)
Locker demand begins with headcount and the busiest time on site. The calculator converts total workers into peak workers using the peak occupancy percentage, then narrows that group to the people who actually need storage. This reflects real welfare planning where not every trade carries the same PPE, change-of-clothes needs, or personal items during a shift. Enter realistic peak values from look-ahead plans, not average attendance, to avoid under-ordering during critical pours, fit-outs, or commissioning windows.
Sharing rules change the count quickly. A one-to-one ratio assumes dedicated lockers, while higher workers-per-locker values represent planned sharing across shifts. The contingency percentage adds a practical buffer for schedule overlap, short-term subcontractors, and weather-driven resequencing. Rounding up is typically preferred because shortages create queues and unmanaged storage in corridors.
Not every locker must be full-height. The full-height percentage splits the recommended total into taller units for hanging gear and shorter units for smaller kits. This split supports mixed crews where some roles need secure garment storage and others only require a compact compartment. Adjusting the split helps balance procurement cost, footprint, and user satisfaction.
Space is often the constraint, not just quantity. The calculator estimates footprint from locker width and depth, then applies a circulation allowance to cover aisles, door swing, and access clearances. If you enter available room area, it reports whether the layout fits, highlights utilization, and estimates a maximum feasible locker count under the same access assumptions.
After submission, results appear immediately above the inputs for quick iteration. CSV export supports take-offs, vendor comparisons, and welfare registers, while the PDF summary suits approvals and toolbox briefings. Use the outputs to coordinate welfare cabins, drying rooms, and access routes early, then revisit inputs when workforce forecasts or shift patterns change. As needed.
It is the busiest expected on-site attendance as a percentage of total workforce. Use short-term peaks from look-ahead plans, not long-term averages, so lockers are available during critical work periods.
Use sharing when different crews use the same welfare space at different times. Increase workers per locker above 1.0 only if shifts are separated and you have a clear handover process.
The calculator increases the base locker count by your contingency percentage, then rounds. This covers overlap, visitors, replacement lockers, and forecast error. If lockers are hard to add later, choose a higher buffer.
Footprint equals locker width times depth for each unit. The circulation allowance then adds space for aisles, access, and door swing. The gross area output is a planning estimate for layouts and cabins.
Enter the available area to see whether the recommendation fits and the implied utilization. If it exceeds, reduce circulation assumptions only if safe, increase sharing, adjust the full-height split, or expand the welfare area.
Yes. Download CSV for spreadsheets and procurement comparisons, or PDF for approvals and briefings. Exports use the most recent calculated values, so run the calculation again after changing any input.
Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.