What is the schedule attainment formula?

Schedule Attainment = Actual Units Completed / Planned Units x 100. With 185 good units completed against a 200-unit plan, attainment is 185 / 200 x 100 = 92.5%. Count good units only, against the plan as it stood at the start of the period.

How do I calculate schedule attainment with several products?

Cap each product at its planned quantity, add the capped completions, and divide by the total plan. If the plan is 100 of A and 100 of B and you build 120 of A and 70 of B, the capped total is 100 + 70 = 170, so attainment is 85%, not the 95% the raw total of 190 would suggest.

What is a good schedule attainment percentage?

Most plants target 90 to 98%. Above 98% for weeks on end often means the schedule is padded; below 90% usually points to a capacity, material or changeover problem worth a Pareto. Track it daily by line so a bad shift is visible the next morning.

What is the difference between schedule attainment and schedule adherence?

Attainment compares quantities: how many of the planned units were built. Adherence also checks timing and sequence: whether each order was built in its planned slot. A line can reach 100% attainment by the end of the week and still have poor adherence if it built Friday's orders on Monday.

How many units short of target is the line?

Units needed for target = planned units x target attainment. On a 200-unit plan with a 95% target that is 190 units; 185 completed leaves the line 5 units short, a 2.5-point gap. The Schedule Attainment Rate Calculator shows both the points and the units.

Production and Throughput

Schedule Attainment Formula

Schedule attainment measures how much of the planned production a line or plant actually completed. Use it in the daily production meeting to see whether the plan was met and how many units the miss cost.

Formula

Schedule Attainment = Actual Units Completed / Planned Units x 100

Variables

Actual Units Completed: Good units finished against the schedule in the period
Planned Units: Units the schedule called for in the same period, after any approved changes

Understanding the Schedule Attainment Formula

Schedule attainment answers one question: did we build what we said we would build? It divides the good units completed by the units the schedule asked for in the same period. In the example, 185 of 200 planned units gives 92.5%. Unlike efficiency or OEE, it says nothing about how fast the equipment ran; a line can run at full speed and still miss the schedule because it built the wrong items or started late.

Count only good units that were on the schedule, and freeze the plan at the start of the period so that late changes do not quietly move the target. When a schedule has several items, the strict form caps each item at its plan: sum of MIN(actual, planned) / sum of planned. The simple total ratio is fine for a one-product line; for a mixed schedule the capped form is the honest one.

Most plants set the target between 90% and 98%, because some misses come from material, quality holds and changeovers outside the line's control. Read the gap in units, not just points: 2.5 points below a 95% target on a 200-unit plan is 5 units a day, which is 25 units a week the customer has to wait for or the plant has to recover with overtime.

Worked Example

The day's schedule called for 200 units. The line completed 185 good units. The plant's target is 95% attainment.

Schedule attainment = 185 / 200 x 100 = 92.5%
Units needed for the 95% target = 200 x 0.95 = 190
Units below target = 190 - 185 = 5 units, a 2.5-point gap

Result: 92.5% schedule attainment, 5 units short of the 95% target

Common Mistake

Letting extra output on one item cover a miss on another. With several items on the schedule, cap each item at its planned quantity before adding up the completions; otherwise building ahead on easy parts hides the parts the customer is still waiting for.

Frequently Asked Questions

What is the schedule attainment formula?: Schedule Attainment = Actual Units Completed / Planned Units x 100. With 185 good units completed against a 200-unit plan, attainment is 185 / 200 x 100 = 92.5%. Count good units only, against the plan as it stood at the start of the period.
How do I calculate schedule attainment with several products?: Cap each product at its planned quantity, add the capped completions, and divide by the total plan. If the plan is 100 of A and 100 of B and you build 120 of A and 70 of B, the capped total is 100 + 70 = 170, so attainment is 85%, not the 95% the raw total of 190 would suggest.
What is a good schedule attainment percentage?: Most plants target 90 to 98%. Above 98% for weeks on end often means the schedule is padded; below 90% usually points to a capacity, material or changeover problem worth a Pareto. Track it daily by line so a bad shift is visible the next morning.
What is the difference between schedule attainment and schedule adherence?: Attainment compares quantities: how many of the planned units were built. Adherence also checks timing and sequence: whether each order was built in its planned slot. A line can reach 100% attainment by the end of the week and still have poor adherence if it built Friday's orders on Monday.
How many units short of target is the line?: Units needed for target = planned units x target attainment. On a 200-unit plan with a 95% target that is 190 units; 185 completed leaves the line 5 units short, a 2.5-point gap. The Schedule Attainment Rate Calculator shows both the points and the units.