Three acronyms get used almost interchangeably on a plant floor, and they measure three different things. OEE, TEEP, and utilization all sound like they’re asking “how well is this machine performing,” but they start from three different denominators, and mixing them up is how a plant manager ends up comparing numbers that were never comparable in the first place.
The one line version of each
OEE measures effectiveness against scheduled time. If the machine was supposed to be running, how much of that time did it spend making good parts at the right speed.
TEEP measures effectiveness against all calendar time, every hour in the day, whether the machine was scheduled or not. It’s OEE with one more factor multiplied in: how much of the calendar the machine was even scheduled to run.
Utilization measures how much of a period the machine was actually running, full stop, with no speed or quality judgment attached. It’s the loosest of the three, and often the first number people reach for because it needs the least setup to compute.
The denominators, side by side
The difference between all three comes down to what’s on the bottom of the fraction.
The same machine, three numbers, one week
Take a machine scheduled for two 8 hour shifts a day, five days a week, 80 scheduled hours. Say it actually ran for 68 of those hours, at a performance factor of 88%, making 96% good parts.
Utilization is run time over scheduled time: 68 / 80, which is 85%. This tells you how much of the planned window the machine was actually turning, nothing about speed or scrap.
OEE is the full three-factor calculation against scheduled time: availability (68/80 = 85%) times performance (88%) times quality (96%), which multiplies out to about 71.8%, a solid number against what other shops actually run. This tells you, of the time you planned to use the machine, how effectively you actually used it.
TEEP takes that same 71.8% OEE and multiplies it by one more factor: how much of all calendar time the machine was even scheduled for. There are 168 hours in a week. This machine was scheduled for 80 of them, so its schedule utilization is 80/168, or about 47.6%. TEEP is OEE times that: 0.718 x 0.476, about 34.2%.
Why TEEP is usually the lowest number in the building
TEEP looks alarming the first time someone sees it next to OEE, because it’s almost always dramatically lower, and the instinct is to assume something’s broken. Nothing is. TEEP is answering a different question: not “how well did we run when we were running” but “how much of all possible time did we capture at all.” A machine that only runs two shifts, five days a week, by design, will always have a low TEEP relative to its OEE, because two thirds of the calendar was never scheduled in the first place.
That’s exactly why TEEP is the wrong number to hand an operator or a shift supervisor. It penalizes decisions those people didn’t make, the shift pattern, the demand plan, the decision to run five days instead of seven. Handing a floor team a TEEP number and asking them to improve it is asking them to fix a scheduling decision above their pay grade.
Which number belongs to which audience
Utilization is the quick health check. It’s useful for a fast glance across a facility map, or spotting a machine that’s sitting idle more than it should be, but it says nothing about speed or scrap, so a machine running slow and full of rework can show 95% utilization and still be a problem.
OEE is the floor number. It’s what an operator, a shift lead, or a maintenance tech should be looking at, because every factor inside it, availability, performance, quality, is something the people running that machine during that shift can actually influence. This is also the number worth comparing across shifts and across similar machines, since the denominator, scheduled time, is the same for everyone being compared.
TEEP is the capacity planning number. It belongs in a conversation about whether to add a shift, buy another machine, or move work to a different site, because it’s the only one of the three that accounts for hours nobody’s even trying to use yet. A plant running strong OEE on two shifts but sitting on a low TEEP is looking at a real answer to “where would a third shift’s capacity come from,” without spending a dollar on new equipment.
The mistake that causes the most confusion
The single most common error is comparing a TEEP number from one machine against an OEE number from another and concluding one is running worse. They’re not comparable, because they don’t share a denominator. A far more common and quieter mistake is a plant that reports OEE company-wide but secretly means something closer to utilization, availability alone, with no performance or quality factor included, because that’s the easiest one to compute from a simple run/stop signal. That number isn’t wrong, but it’s incomplete, and calling it OEE when it’s really just availability sets an expectation the number can’t back up the moment someone asks what the performance factor was.
The fix is naming the number for what it actually measures, every time it gets reported, rather than letting “OEE” become a catch-all label for whatever percentage happened to be easiest to calculate that quarter.
Quick recap
- Utilization compares run time to scheduled time, no speed or quality factor
- OEE multiplies availability, performance, and quality against scheduled time
- TEEP multiplies OEE by how much of all calendar time the machine was even scheduled for
- The same machine on the same week can show 85% utilization, 71.8% OEE, and 34.2% TEEP, all at once
- OEE belongs to the floor, it’s the number operators and shift leads can actually act on
- TEEP belongs to capacity planning, it’s the number for deciding whether to add a shift or a machine
- Never compare TEEP on one machine against OEE on another, they don’t share a denominator
TEEP, OEE, and utilization FAQ
What is the difference between TEEP and OEE? OEE measures effectiveness against scheduled production time. TEEP measures the same effectiveness against all calendar time, including hours the machine was never scheduled to run at all. TEEP is always equal to or lower than OEE on the same machine.
Is utilization the same as OEE? No. Utilization only compares run time to scheduled time, with no factor for speed or quality. A machine can show high utilization while running slow or making bad parts, which OEE would catch and utilization would not.
Which metric should a plant manager track day to day? OEE, for the floor. It’s the number operators and shift leads can act on directly. TEEP matters for capacity and shift-add decisions, and belongs in a planning conversation, not a shift report.