Free OEE Calculator (Overall Equipment Effectiveness)

HOW IT WORKS

1. Enter production time — planned production time and downtime, both in minutes.
2. Enter cycle time and counts — ideal cycle time in seconds per unit, plus total units and good units produced.
3. Read the breakdown — Availability, Performance, and Quality update in real time, along with the combined OEE%.
4. Interpret OEE% — 85%+ is world class, 60–85% is typical, below 60% signals room for improvement.

What is the OEE formula?

OEE = Availability × Performance × Quality. Availability is Run Time ÷ Planned Production Time. Performance is (Ideal Cycle Time × Total Units) ÷ Run Time. Quality is Good Units ÷ Total Units. Multiplying all three gives the overall percentage of planned production time that was truly productive.

What is considered a good OEE score?

An OEE of 85% or higher is generally considered world class for discrete manufacturing. 60–85% is typical for many plants and represents room for improvement. Below 60% usually points to significant losses in availability, performance, or quality that are worth investigating.

What counts as downtime in the OEE formula?

Downtime includes both unplanned stops (breakdowns, changeovers, material shortages) and planned stops that reduce available run time, such as scheduled maintenance. It should not include time excluded from the planned production schedule, like meal breaks that are already subtracted before you set Planned Production Time.

How is Ideal Cycle Time different from actual cycle time?

Ideal Cycle Time is the fastest theoretical time to produce one unit — usually the machine's rated or design speed. Actual cycle time (Run Time ÷ Total Units) is normally slower due to minor stops, reduced speed, and startup losses, which is exactly what the Performance factor measures.

Why is my Performance value over 100%?

A Performance value above 100% means the process ran faster than its rated Ideal Cycle Time during the counted run time. This usually indicates the Ideal Cycle Time entered is set too conservatively — double-check it against the equipment's actual rated speed.