On-Time Delivery (OTD)

On-Time Delivery (OTD) is a supply chain performance metric that measures the percentage of deliveries received by the agreed delivery date. It is commonly used by purchasing teams, manufacturers, and supply chain managers to evaluate supplier reliability and determine whether deliveries meet established schedules.

For buyers sourcing products from manufacturers, OTD helps answer a practical question: how consistently does a supplier deliver orders when promised? A supplier may offer competitive prices and acceptable product quality, but repeated delivery delays can still disrupt inventory planning, production schedules, product launches, and customer commitments. OTD provides a measurable way to track this aspect of supplier performance rather than relying solely on delivery promises or individual experiences.^[1][2]

OTD is usually expressed as a percentage. A higher rate generally indicates more reliable delivery against the agreed schedule, although the result depends on how the business defines an eligible delivery, the delivery deadline, and what counts as being on time. There is no single calculation method that fits every business, so buyers and suppliers should agree on the measurement rules before using OTD to compare performance.^[3]

How to Calculate the On-Time Delivery Rate

The basic OTD formula is:

OTD (%) = (Number of on-time deliveries ÷ Total number of deliveries due) × 100

For supplier performance measurement, businesses may count individual deliveries, purchase order lines, or scheduled delivery quantities. The selected unit should match the purpose of the analysis and remain consistent across the reporting period.^[1][2]

Example:

A buyer expects 50 purchase order lines to be delivered during October. By the agreed due dates, 46 lines have been received on time, while four arrive late.

OTD = (46 ÷ 50) × 100 = 92%

The supplier's OTD rate for the period is 92%. This means that 92% of the purchase order lines due in October met the agreed delivery deadline under the buyer's measurement rules.

A 92% OTD rate does not, by itself, explain why the remaining deliveries were late or how seriously those delays affected the buyer. Further analysis may be needed to identify recurring issues, such as production delays, late raw materials, capacity constraints, or transportation disruptions.

What Counts as an On-Time Delivery?

The definition of "on time" must be established before calculating the metric. Some buyers measure whether goods arrive at their warehouse by the required date, while others measure whether a supplier dispatches an order by an agreed shipping date. These are different milestones and should not be treated as interchangeable.

For international purchasing, the distinction is particularly important. A supplier may complete production and ship an order on the promised date, but the goods may reach the destination later because of transit time, customs clearance, or other transportation factors. Buyers should therefore specify whether they are measuring production completion, shipment dispatch, or arrival at the named destination.

The delivery deadline also needs to be clear. Businesses should determine whether early deliveries count as on time, whether a tolerance window is allowed, how approved date changes are handled, and whether the original requested date or the latest mutually confirmed date is used. The Institute for Supply Management highlights these differences as important considerations when defining and comparing OTD performance.^[3]

OTD vs. OTIF vs. Fill Rate

OTD, On-Time In-Full (OTIF), and Fill Rate all help buyers evaluate supply chain performance, but they measure different aspects of fulfillment.

OTD focuses on timeliness. Unless the measurement rules explicitly include quantity requirements, a delivery may count as on time even if part of the order is missing. OTIF is stricter because it considers both timing and completeness: an order only qualifies when it meets both requirements.^[4][5]

Fill Rate focuses on quantity fulfillment. Its calculation can be based on units, order lines, or customer demand, so the exact formula should be stated when reporting results. A supplier can have a high Fill Rate but a poor OTD rate if most of the required goods are supplied but frequently arrive late.

For example, a buyer orders 1,000 units with a confirmed delivery date. The supplier delivers all 1,000 units on time. Under a matching order-level definition, the delivery qualifies for OTD and OTIF, and the quantity requirement is fully satisfied. If the supplier delivers all 1,000 units five days late, the order fails OTD and OTIF, even though the quantity supplied is complete. This illustrates why buyers should monitor more than one metric when evaluating supplier performance.

What Affects On-Time Delivery?

OTD reflects the performance of multiple activities, from production planning to final delivery. Understanding the main causes of delays helps buyers distinguish recurring supplier issues from isolated events and decide where corrective action is needed.

Production capacity and scheduling. A supplier may accept more orders than its available production capacity can support. Poor scheduling, equipment downtime, labor shortages, or competing customer orders can push production beyond the planned completion date. Reviewing factory capacity and realistic production lead times can help buyers assess whether a promised schedule is achievable.

Raw material and component availability. Manufacturing may be delayed when materials arrive late, components are unavailable, or incoming materials fail to meet specifications. Suppliers that depend on multiple upstream sources may face additional uncertainty when any critical component is delayed.

Production and quality problems. Rework, rejected materials, process issues, and repeated corrective actions can extend production time. A supplier may finish the planned manufacturing activities but still miss the shipment date if defects must be corrected before release.

Shipping and transportation. Transit time, vessel schedules, port congestion, customs clearance, and delivery appointments can affect when goods arrive. For international orders, buyers should distinguish delays within the supplier's control from those occurring after handover to a carrier, while continuing to track the delivery outcome that matters to their business.

Forecast changes and order amendments. Late changes to specifications, quantities, packaging, or delivery requirements may affect the original schedule. Buyers and suppliers should document approved changes and confirm revised dates rather than relying on informal communications.

Why Is OTD Important in Purchasing?

OTD helps purchasing teams turn supplier delivery reliability into a trackable performance measure. Reviewing the metric over time can reveal whether a supplier consistently meets commitments or whether delays are becoming more frequent. This is especially useful when a business depends on regular replenishment, coordinated production schedules, seasonal product launches, or delivery dates promised to its own customers.^[1][2]

A low OTD rate may lead to additional costs even when the supplier's unit price is attractive. Buyers may need to hold more safety stock, arrange expedited transportation, reschedule production, or delay product launches. Late deliveries can also increase administrative work as teams chase shipment updates and revise inventory plans.

OTD can also support supplier reviews and improvement discussions. Instead of making a general complaint about late deliveries, buyers can review the affected orders, compare promised and actual dates, identify recurring causes, and agree on corrective actions. However, OTD should not be used alone to determine whether a supplier is suitable. Product quality, order completeness, communication, price, and responsiveness should also be considered.

How to Track and Improve OTD

A useful OTD tracking process starts with a clear, shared definition. Buyers should record the original requested date, mutually confirmed delivery date, actual delivery or receipt date, quantity due, quantity received, and any approved changes. These records provide the basis for calculating performance and investigating exceptions.

OTD should be reviewed across a suitable reporting period and segmented where useful—for example, by supplier, product category, purchase order, or shipping route. Looking only at an overall percentage can conceal important differences. One supplier may perform reliably on routine products but struggle with customized orders, while another may meet production deadlines but experience inconsistent transit times.

When delays occur, buyers and suppliers should identify the cause and agree on practical follow-up actions. Depending on the issue, these may include more realistic lead-time commitments, improved production scheduling, earlier confirmation of material availability, clearer order specifications, or more frequent progress updates. Monitoring whether these actions improve subsequent delivery performance is more useful than treating a single OTD result as a complete assessment.

It is also important to review the metric alongside other performance indicators. OTD measures timing, while Fill Rate and OTIF help assess quantity fulfillment. Lead-time variability provides additional context about how predictable delivery schedules are. Together, these measures offer a more balanced view of supplier reliability and supply chain risk.

Frequently Asked Questions

What is a good OTD percentage?

There is no universal OTD target that is appropriate for every supplier or industry. The right target depends on product criticality, order frequency, agreed lead times, customer commitments, and the consequences of a late delivery. Buyers should establish a target based on business requirements and review actual performance against that target over time.

Is OTD calculated by order or by unit?

Both approaches are used. An order-based calculation counts qualifying orders or purchase order lines, while a unit-based calculation measures the proportion of required units received on time. The results may differ substantially when orders vary in size or when partial deliveries occur. The chosen method should be documented and applied consistently.

Do partial deliveries count as on time?

It depends on the agreed definition. Under a basic delivery-based OTD measure, a shipment may count as on time if it arrives by the deadline, even if it contains only part of the order. If the buyer needs to know whether the entire order arrived on time and in the required quantity, OTIF is usually more appropriate. Businesses should also specify how multiple partial shipments are counted to avoid overstating performance.

What is the difference between OTD and lead time?

Lead time measures the duration between defined starting and ending points, such as purchase order placement and receipt of goods. OTD measures whether a delivery meets an agreed deadline. A supplier can have a relatively long lead time but a high OTD rate if its commitments are realistic and consistently met. Conversely, a supplier with a short average lead time may have a low OTD rate if actual delivery dates vary significantly.

How often should OTD be measured?

The reporting frequency depends on order volume and business needs. Monthly reviews may be sufficient for some purchasing programs, while high-volume or production-critical supply may require weekly or more frequent monitoring. Whatever the frequency, the denominator should include the deliveries due within the defined period, and the reporting rules should remain consistent.

On-Time Delivery for Global Buyers

For global buyers, reliable delivery depends on more than the date initially quoted by a manufacturer. It requires realistic lead-time expectations, clear order specifications, timely communication, and visibility into production and shipment progress. OTD helps buyers evaluate whether confirmed delivery commitments are being met and provides a basis for identifying where schedules need improvement.

NewBuyingAgent helps global buyers source products from China and coordinate purchasing activities around their requirements. Clear specifications, confirmed order details, and consistent production follow-up can help buyers manage expectations and identify potential schedule issues earlier. OTD can be used alongside other supplier and order performance measures to support more informed purchasing decisions.

References

[1] Amazon Business. Procurement KPIs: Formulas and Benchmarks to Track. https://business.amazon.com/en/blog/procurement-kpis

[2] APQC. Percentage of Supplier Orders Received by Original Request Date (On Time). https://www.apqc.org/what-we-do/benchmarking/open-standards-benchmarking/measures/percentage-supplier-orders-received

[3] Institute for Supply Management (ISM). The Monthly Metric: On-Time Delivery. https://www.ismworld.org/supply-management-news-and-reports/news-publications/inside-supply-management-magazine/blog/2017-11/the-monthly-metric-on-time-delivery/

[4] DHL Logistics of Things. On-Time In-Full (OTIF). https://lot.dhl.com/glossary/on-time-in-full-otif/

[5] APQC. Percentage of Orders Delivered Complete and on Time (aka On Time in Full (OTIF)). https://www.apqc.org/what-we-do/benchmarking/open-standards-benchmarking/measures/percentage-orders-delivered-complete