On time delivery (OTD)

On time delivery (OTD) is a performance metric that measures how reliably customer orders, production orders, or shipments are delivered by their committed due dates. In manufacturing and industrial operations, it is used to track schedule adherence for outbound deliveries to customers, internal transfers between plants, or completion of work orders.

Typical definition and calculation

Although organizations may define it differently, OTD commonly refers to the percentage of orders delivered on or before an agreed delivery date during a defined period.

A typical high-level formulation is:

• Numerator: Number of orders (or lines, or shipments) delivered on or before the committed date, following the inclusion/exclusion rules.
• Denominator: Total number of orders (or lines, or shipments) due in the same period, using the same inclusion/exclusion rules.

The exact definition should specify:

• Whether the unit of measure is orders, order lines, shipments, pallets, or pieces.
• What date is used as the commitment (customer request date, confirmed date, planned ship date, etc.).
• What date is used as actual (goods issue date, arrival at customer, receipt at internal warehouse, work order completion timestamp).
• The allowed tolerance (if any), such as counting deliveries one day early or one day late as “on time”.
• Data sources (ERP, MES, logistics system) and how conflicts are resolved.
• Inclusion and exclusion rules, such as handling canceled orders, reschedules, customer holds, or partial shipments.

Use in regulated and integrated environments

In regulated manufacturing, OTD is commonly monitored alongside metrics such as OEE and first pass yield to assess supply reliability and capacity performance. It may be used in supplier scorecards, service level agreements, and internal performance reviews.

Operationally, OTD connects planning and execution systems. Planning and MRP tools set the committed dates, while MES, warehouse management, and shipping systems record actual completion or ship dates. Consistent integration and clear ownership of the definition are important for comparing OTD across lines, plants, or suppliers.

Common confusion

• On time delivery vs. lead time: OTD measures whether delivery met the promised date, not how long it took. A long but reliable lead time can still result in high OTD.
• On time delivery vs. fill rate / service level: OTD usually focuses on timing. Fill rate and service level often address quantity completeness or availability and may use different denominators and rules.
• On time delivery vs. production schedule adherence: Production adherence measures how well production follows its internal schedule. OTD is typically defined at the customer or shipment level, though internal work orders can also use an OTD-style measure.

Link to the source context

When OTD is used alongside metrics such as OEE and first pass yield, comparability across products, lines, and sites requires a written definition. This usually includes explicit numerators, denominators, time bases, data sources, and clear inclusion and exclusion rules so that reported OTD values are consistent and auditable.