Do changeovers come out of planned production time or availability?

Out of availability. OEE counts a changeover as a planned stop inside planned production time, so a mid-shift changeover shows up as lost availability, not a shorter shift.

How do I get availability from my stop log?

Divide run time by planned production time. With 450 planned minutes and 54 minutes of faults, starving and blocking, run time is 396 minutes and availability is 88%.

Should I fix stops or first-pass yield first?

Fix whichever loss row is larger. At the defaults, stops cost 216 parts a shift and rejects about 48, so halving stop time adds about 105 good parts.

Does a robot cell stop for breaks?

Only if it needs an operator to load, unload or clear faults. A cell that runs through breaks counts those minutes as planned production time; one that stops leaves them out, as OEE does.

Robotics & Automation calculator

Robot Cell Capacity Calculator

Find how many good parts a robot cell delivers in a shift once stops and rejects come out, and how much extra time a shortfall needs. You need planned production time, cycle time, parts per cycle, availability, yield and demand.

What this calculator does

Good parts a robot cell makes in one shift, and whether they cover the shift's demand.

Formula used

Parts at full cycle rate = planned production time × 60 ÷ cell cycle time × parts per cycle
Good parts per shift = full-rate parts × availability × first-pass yield ÷ 10,000
Lost to stops = full-rate parts × (100 − availability) ÷ 100; lost to rejects = full-rate parts × availability × (100 − yield) ÷ 10,000
Load = required ÷ good parts × 100; extra time = MAX(0, required − good parts) ÷ good parts × planned production time
Longest cycle = planned production time × 60 × parts per cycle × availability × yield ÷ 10,000 ÷ required

Inputs explained

Planned Production Time: Shift length minus breaks and other time not scheduled to run.
Cell Cycle Time: Slower of the robot and machine cycles, timed while the cell runs.
Parts per Cycle: Parts leaving the cell each cycle, from the fixture layout.
Availability: Run time ÷ planned production time, from the cell's stop log.
First-Pass Yield: Parts good first time ÷ parts made, rework counted as failures.
Good Parts Required per Shift: Shift demand from the schedule: weekly demand ÷ shifts run.

How to use the result

Best suited to committing a daily output target for a cell, deciding on overtime when a cell falls short.
Averages from a mature cell overstate a new cell in ramp-up; use your own ramp-up data.

Current U.S. benchmarks

Global copper trades at $13,543 per tonne (IMF via FRED, Jul 2026), up 38.6% in a year, and U.S. industrial electricity averages 9.77 cents per kWh. Both feed electrified-hardware unit economics.

Common questions

Do changeovers come out of planned production time or availability? Out of availability. OEE counts a changeover as a planned stop inside planned production time, so a mid-shift changeover shows up as lost availability, not a shorter shift.
How do I get availability from my stop log? Divide run time by planned production time. With 450 planned minutes and 54 minutes of faults, starving and blocking, run time is 396 minutes and availability is 88%.
Should I fix stops or first-pass yield first? Fix whichever loss row is larger. At the defaults, stops cost 216 parts a shift and rejects about 48, so halving stop time adds about 105 good parts.
Does a robot cell stop for breaks? Only if it needs an operator to load, unload or clear faults. A cell that runs through breaks counts those minutes as planned production time; one that stops leaves them out, as OEE does.

Last reviewed 2026-10-01.