Overall equipment effectiveness: practical guide

What to prepare

• Gather order history, item dimensions, weights and supplier lead times.
• Identify the same units and planning period across stock, demand and capacity inputs.
• Check which freight, storage, import or production costs the model includes.

Understand the inputs

The calculation method

OEE = availability × performance × quality. Performance compares ideal cycle production time with actual run time.

Worked example

Illustrative inputs and their result.

Example inputs

Planned production time (minutes)

480

Unplanned downtime (minutes)

60

Ideal cycle time per unit (seconds)

30

Total units produced

700

First-pass good units

665

Calculated example result

Oee Percent

69.27%

Availability Percent

87.5%

Performance Percent

83.33%

Quality Percent

95%

How to interpret the result

A capacity, inventory or landed-cost estimate is not a guarantee of service availability. Variability in demand, lead time, packing and customs treatment can change the operating result.

Keep the service requirement fixed while testing demand, lead time or shipment size. Check practical constraints such as handling, access and supplier minimum quantities separately.

Common mistakes to avoid

• Do not mix usable capacity with nominal capacity.
• Keep net goods weight separate from packaged or shipping weight.
• Do not treat a supplier's usual lead time as a guaranteed maximum.

Assumptions and sources

Planned non-production is excluded from planned time. A raw performance over 100% triggers a cycle-time review and is capped in OEE.

Related logistics & production guides

• Economic order quantity: practical guide
• Inventory reorder point: practical guide
• Demand and lead-time safety stock: practical guide
• Stock cover and incoming supply: practical guide
• Imported goods landed cost: practical guide
• Pallet box capacity: practical guide