OEE calculator
Your OEE calculator, with the awkward number left in.
Five figures off one shift and you have an OEE. The arithmetic is not the hard part — availability × performance × quality has not changed in forty years. What decides whether the answer means anything is the standard cycle time you feed it, and almost nobody checks that.
So this one shows performance twice: what your numbers actually say, and the capped version everyone reports. When those two disagree, the gap is the finding.
One machine, one shift
Five numbers from a single window.
Take one machine over one shift or one day — not a whole factory averaged together, which is how an OEE figure stops meaning anything. Everything updates as you type, nothing is sent anywhere, and there is no email box on this page.
Overall equipment effectiveness
The three components
Performance, uncapped
Performance above 100% is not a fast machine. It means the standard cycle you entered is slower than what the machine is really doing, so every OEE figure built on it is flattering you. Fix the standard before you report the number — and note that capping it, which is what almost every system does silently, hides exactly this.
Where it is going
Availability is costing you the most — the machine is not running when it is scheduled to. Stops, changeovers and waiting — not speed, and not scrap.
No production in this window
Nothing ran, so there is no OEE to report.
This is deliberately not 0%. A machine that was never scheduled, or never started, has not scored zero — it has no score. Reporting it as 0% drags a weekly average down for a window that should have been excluded, and that single behaviour is responsible for a great many OEE figures nobody trusts.
One machine, one window, five numbers you typed. It is the same arithmetic a production system runs continuously across every machine — the difference is that it does not depend on anyone remembering to write the stops down, and it keeps the standard cycle honest because it can see the actual one. That is live monitoring and honest OEE.
Bring us the figure you do not believe.
If your OEE looks too good, or moved ten points for no reason anybody can explain, send us the numbers you put in here. An engineer will tell you which input is doing it. That conversation costs nothing and usually takes one call.