Define the target first
Decide what lead-time threshold counts as meeting the target before counting orders.Enter total evaluated orders
Use the number of completed orders in the same review period and scope.Enter orders within target
Count only orders that satisfy the chosen lead-time rule.Review misses and service level
The percentage shows the compliant share, while the missed-order count shows the remaining exceptions.
Supplier Lead Time Service Level Estimator
The Supplier Lead Time Service Level Estimator measures the share of supplier orders that meet a defined lead-time target. Procurement teams can use it to summarize on-time lead-time performance across a set of orders without mixing the result with cost or quantity measures.
The calculator reports both the service-level percentage and the number of orders that missed the target. Because the result depends on how “within target” is defined, use the same target rule across the orders being compared.
Order performance
orders
orders
Result
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Supplier lead time service level
Orders evaluated—
Within target—
Missed target—
Service level—
Formula:
Service level (%) = Orders within lead-time target ÷ Total evaluated orders × 100Where:
- Orders within lead-time target — count of evaluated orders meeting the stated lead-time threshold
- Total evaluated orders — all orders included in the measurement period
Assumptions: Orders within target cannot exceed total evaluated orders. The calculator uses an order-count service level and does not weight orders by spend, units, or business priority.
What the result means
The supplier met the defined lead-time target on 148 of 160 evaluated orders.
This result is an operational estimate based only on the values entered. Apply the same definitions and units when comparing scenarios.
Given:
- Total evaluated orders = 160
- Orders within target = 148
Calculation:
Missed target = 160 − 148 = 12 orders
Service level = 148 ÷ 160 × 100
Service level = 92.5%
Result: 92.50%
The supplier met the defined lead-time target on 148 of 160 evaluated orders.
What counts as meeting the lead-time target?
That rule should come from your operating agreement or internal policy. For example, you might define success as receipt on or before a promised lead-time date.
Should cancelled orders be included?
Only include them if your reporting policy treats cancellations as evaluated supplier outcomes. Otherwise exclude them consistently from both counts.
Can I combine different suppliers in one calculation?
You can for a portfolio-level view, but a combined result may hide variation among suppliers. Supplier-by-supplier calculations are usually more diagnostic.
Why is order count used instead of units?
This tool estimates an order-based service level. A unit-weighted or value-weighted service measure answers a different question and may produce a different percentage.
What should I do with missed-target orders?
Use the count as a starting point for exception analysis. Review causes such as supplier preparation, transportation, customs, or internal receiving rather than assuming one source of delay.