Machine Output Calculator
Estimate what a machine can produce for you: scheduled hours, productive spindle hours, setups and good parts per day, week, month and year, from your own shifts, cycle time and batch sizes.
From the shift schedule to good parts.
Everything runs in this browser and works offline. Nothing is submitted, stored or sent to The Machine Blue Book.
Sensitivity
How this was calculated
Planning estimate only. Results are estimates for planning and education. Actual output depends on the part, program, tooling, workholding, operator and maintenance. The Machine Blue Book is an informational and educational resource and does not buy, sell or broker machines. No market price or valuation is shown or implied.
Five inputs decide most of the answer.
Start with the schedule you can actually staff, then the job you expect to run most often.
1. Set the schedule
Enter hours per shift, shifts per day, days per week and weeks per year. Subtract planned downtime such as preventive maintenance, warm-up cycles and holidays not already removed from the weeks figure.
2. Choose a realistic utilization
Utilization is the share of scheduled time the machine is actually cutting or setting up, after unplanned stops, waiting for material, inspection and breaks. The type default is a rule of thumb; replace it with measured spindle-on time when available.
3. Enter the cycle time
Use the full floor-to-floor time per part, including tool changes and part load and unload, not only cutting time from the CAM estimate.
4. Add setups and scrap
Setup time and batch size determine how many changeovers fit in a week. Scrap and rework remove parts that consumed machine time but cannot ship.
5. Optionally add your own rate
If you enter your own shop rate or value per good part, the calculator converts capacity into your currency. Those figures are yours; MBB supplies no rate or price.
Machine output questions.
Planning arithmetic, not engineering, financial or appraisal advice.
How do I estimate parts per hour on a CNC machine?
Divide 60 by the cycle time in minutes to get theoretical parts per hour, then multiply by utilization and by (1 minus the scrap rate). A 4 minute cycle is 15 parts per hour at 100 percent; at 65 percent utilization and 2 percent scrap it is about 9.6 good parts per hour. Subtract setup time whenever the job changes during the shift.
What utilization should I assume for a machine?
Use measured spindle-on time from the control or a monitoring system if it exists. Without it, many planners start from rules of thumb such as 50 to 70 percent for a manned vertical machining center or lathe, and higher for machines with pallet changers, bar feeders or long unattended burns. These are planning assumptions, not measured data, and new jobs often run lower until the process is proven.
Does a second shift double machine output?
Rarely. A second shift roughly doubles scheduled hours, but warm-up, handovers, setups and thinner staffing on later shifts often lower utilization. Model the added shift with a realistic utilization, and check that hours per shift times shifts per day does not exceed 24.
How much does setup time reduce output?
Every changeover consumes machine time that produces no parts. This calculator treats each batch as one setup plus batch size times cycle time, so small batches with long setups cut good parts sharply. Larger batches, quick-change workholding and offline tool presetting are the usual levers.
Can lights-out machining add capacity?
Yes, when the process is stable: reliable chip control, tool life management, probing, a bar feeder or pallet system and a program proven on attended shifts. Enter unattended time as extra shift hours with a conservative utilization, and confirm safety, fire and insurance requirements for unattended operation.