Standard Time
Definition
Standard time is the time a qualified worker needs to complete a task at a normal, sustainable pace using the prescribed method, including allowances for fatigue, personal needs, and unavoidable delays.
In Practice
Standard time is the atomic unit of operations math. It is built by measuring observed time, rating the operator's pace to normalize it, then adding allowances — typically 10–15% — for rest and routine interruptions. A pick task observed at 50 seconds, rated at 110% pace, with 12% allowances yields a standard of about 62 seconds.
Everything downstream consumes it: routings use standard times to schedule and load work centers, capacity plans convert forecast volume into required hours and headcount, standard costs price labor into products, and performance reporting compares actual output against standard. When methods change — new equipment, better slotting — standards must be restudied or every plan built on them drifts.
Frequently Asked Questions
How is standard time calculated?
Observed time is first adjusted by a performance rating to get normal time — an operator working at 110% pace for 50 seconds yields 55 seconds normal time. Then allowances for fatigue, personal time, and unavoidable delays (typically 10–15%) are added, giving the standard time used in planning.
Why does standard time matter for capacity planning?
Capacity plans translate demand into hours using standards: 10,000 units of forecast times a 6-minute standard equals 1,000 labor hours, which staffing and machine loading are built on. If standards are stale or padded, the plant systematically over- or under-staffs, and product costs mislead pricing.
Related Terms
A performance standard is an established benchmark — such as units per hour, picks per shift, or defects per million — against which actual work output, quality, or process results are measured and managed.
Idle TimeIdle time is time during which a worker or machine is available but not producing — waiting for materials, instructions, setups, repairs, or upstream work — representing paid capacity that generates no output.
Capacity PlanningCapacity planning is the process of determining the production, storage, and labor resources needed to meet expected demand, and deciding how to close gaps between required and available capacity.
Internal Setup TimeInternal setup time is the portion of a changeover that can only be done while the machine is stopped — such as removing and mounting dies, making adjustments, and running first-piece inspection — so it directly consumes production capacity.