Shop Load Versus Capacity Calculator for VISUAL Work Centers
Before releasing more work orders, it helps to know whether a work center can absorb them. This calculator compares planned hours against realistic capacity so you see overload and backlog before the schedule slips.
Your numbers
Allow for breakdowns, changeovers and breaks
Your results
A planning estimate. Real capacity depends on mix, changeovers, labor availability and scheduling rules in your system.
Load share of capacity as efficiency changes
Sweeps Efficiency and availability from 50 to 100, holding your other inputs fixed.
Scheduling review
An optional look at how your load and capacity data could be reported automatically.
Optional. The tool and every export work without this. No spam.
How to use the calculator
Enter the number of machines, shifts, hours per shift and working days, then an efficiency figure that covers downtime and changeovers. Put in the planned load for the week from your scheduling report, and the backlog beyond it. The results show effective capacity, how loaded the center is and how many weeks it would take to clear everything.
- Use a load figure from your schedule, not from sales forecasts
- Start with an efficiency from historical actuals
- Run it per work center, not for the whole plant
The formulas
Gross hours are machines times shifts times hours per shift times days. Effective capacity multiplies by efficiency. Load share divides load by capacity. Weeks to clear divides load plus backlog by weekly capacity. A load share above one hundred percent means overload. Many planners aim for eighty to ninety percent so urgent jobs and breakdowns have somewhere to land.
Common mistakes
Planners often use gross hours as capacity and then wonder why the schedule slips. Others mix labor hours with machine hours, which differ when one operator tends several machines. Be clear which one your load figure measures.
- Ignoring changeover and maintenance time
- Counting labor hours against machine capacity
- Looking at weekly averages while the load is front-loaded
Frequently Asked Questions
What efficiency should I use?
Use your actual historical figure for the work center if you have one. Seventy to eighty-five percent is a common planning range for discrete shops, but your own data beats a generic number.
Is this finite scheduling?
No. It is a rough load check at weekly level. Finite scheduling places individual operations by sequence and dates, which your ERP or scheduling tool handles.
Why does the chart sweep efficiency?
Because efficiency is usually the least certain input. The chart shows how sensitive the load share is to it, so you can see the risk if actual efficiency is lower than planned.
Can I use it for labor instead of machines?
Yes. Enter headcount as machines and your productive hours as shift hours. Just keep load in the same unit, which is labor hours in that case.
If you want capacity checks fed automatically from your scheduling data, we can discuss that. The calculator is free and stands alone.
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