Maintenance Technician Staffing Calculator
How many technicians does the plant need is a hard question to answer with a gut feel. This calculator converts your annual hands-on workload, backlog and wrench time into a headcount estimate, and shows how much each improvement in planning efficiency is worth.
Your numbers
Planned hours from PM work orders for one year
Breakdown and repair hours from the last 12 months
Ready-to-work backlog hours above normal
Share of time spent doing hands-on work, after travel, waiting and meetings
Your results
A planning estimate. Real staffing also depends on skill mix, shift coverage, geographic spread, contractor use and safety rules such as two-person tasks.
Technicians needed vs wrench time
Sweeps Wrench time of available hours from 20 to 70, holding your other inputs fixed.
Maintenance workload from your ERP
Optional: talk to us about extracting PM, corrective and backlog hours from your ERP for planning.
Optional. The tool and every export work without this. No spam.
How to use it
Use hands-on hours from completed work orders, not paid hours. Take PM and corrective hours from the last 12 months of the CMMS or ERP, add project work and enter any backlog you want to clear, with the number of months you will take to do it. Then set leave and training allowance, and an honest wrench time. If you are unsure, test 30, 40 and 50 percent and read the chart.
- Use actual labour hours posted to work orders
- Include only backlog above a healthy level of about two to four weeks
- Use fully loaded rates for the cost output
- Re-run when PM scope or the asset base changes
The formulas
Available hours = paid hours x (1 - absence share). Productive hours = available hours x wrench time. Workload = PM + corrective + project + backlog per year. Technicians needed = workload / productive hours. For the default numbers, available hours are about 1,789, productive hours about 716, and the workload of 15,600 hours needs around 21.8 technicians, so rounded up it is 22. Notice how sensitive the answer is to wrench time.
Wrench time is the lever
Studies and benchmarks often put average wrench time for reactive maintenance organisations in the range of roughly 25 to 35 percent, and well-planned organisations considerably higher. Time lost to waiting for parts, permits, tools, travel and unclear instructions is the difference. Raising wrench time by 10 points can remove several positions from the requirement, which is why planners and a well-run storeroom often pay back faster than extra hires.
Common mistakes
Mixing paid hours and hands-on hours double counts non-productive time. Ignoring shifts is another error: this result is total headcount, and covering three shifts or weekends may need more people than the arithmetic says. Do not include operator-performed maintenance in the technician workload unless operators are counted in the headcount. Finally, treat backlog as temporary: do not hire permanently for a one-off catch-up.
Frequently Asked Questions
What is wrench time?
Wrench time is the share of a technician's working time spent doing hands-on maintenance, as opposed to travel, waiting for parts or permits, meetings and looking for information. It is usually measured with work sampling observations over a few weeks.
What is a typical wrench time?
Many reports suggest averages around 25 to 35 percent in reactive organisations, with well-planned ones reaching 50 percent or more. Your own value should come from observation, because it varies with plant layout, planning and storeroom service.
Should I include contractors?
Remove from the workload the hours you plan to give to contractors, or add contractor hours separately. Using contractors for peaks and specialist work, and staff for the steady base, is a common way to avoid over-hiring.
How do I estimate hands-on hours without a CMMS?
Use timesheets or a sample of recent jobs, and multiply the average hands-on hours by the number of jobs per year. Expect lower accuracy, and improve the estimate as you collect real labour data on work orders.
We can help pull hands-on hours, PM hours and backlog out of your ERP automatically so staffing numbers are based on current data.
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