What is Shrinkage?

Shrinkage is the percentage of an agent’s scheduled time that they are not available to handle customer contacts. Breaks, lunches, training, coaching, meetings, system outages, sickness, and unplanned absence are all shrinkage. It is the gap between the agents the schedule shows and the agents the queue actually sees — and the central input every workforce-management plan has to get right or the service-level target slips.

How shrinkage is calculated

The standard formula is:

Shrinkage = (Total unavailable time ÷ Total scheduled time) × 100

If 100 agents are scheduled for 8 hours each (800 scheduled hours) and 240 hours of that time is spent on breaks, training, sickness, and other unavailable states, shrinkage is 30%. The schedule promises 100 agents but the queue gets 70.

Most operations report shrinkage by interval (15- or 30-minute slots) because the loss is not uniform — morning meetings concentrate non-productive time at specific points in the day that staffing must compensate for.

Internal vs. external shrinkage

The standard split helps locate where the time is going and whether it is recoverable:

• Internal shrinkage: time the agent is at work but not on contacts. Breaks, lunch, training, coaching, team meetings, system outages, and after-call work overruns. Reducible through process and tooling changes.
• External shrinkage: time the agent is not at work at all. Holidays, sickness, no-shows, late starts, early leaves, attrition gaps. Reducible mostly through engagement, scheduling flexibility, and hiring practices.

A 30% total shrinkage figure is very different operationally depending on whether 25% of it is meetings (fixable) or 25% of it is unplanned absence (cultural).

What is a typical shrinkage rate?

Industry benchmarks settle in fairly consistent bands:

• Best-run operations: 20-25% — tight scheduling, low absenteeism, efficient meeting and training rhythms.
• Average operations: 30-35% — the most common operating band for mature contact centers.
• Stressed operations: 35-45% — large meeting overhead, high sickness, or significant attrition.

Operations that report shrinkage below 20% are usually either miscounting (excluding scheduled training from the denominator) or systematically underinvesting in coaching and development.

Why shrinkage matters for staffing

Erlang-C staffing math sizes agents for forecast volume — but the answer is in available agents, not scheduled agents. Apply Erlang C without a shrinkage adjustment and the schedule will be chronically short. The standard correction:

Scheduled agents = Required available agents ÷ (1 - Shrinkage)

If the Erlang model says 70 agents are needed and shrinkage is 30%, the schedule needs 100 agents. Underestimate shrinkage by even 5 points and the operation misses service level every day.

How to reduce shrinkage

• Spread training and coaching across the day instead of concentrating in peaks — same total hours, less queue impact.
• Tighten meeting discipline: cut frequency, length, and required attendees.
• Self-scheduled flexibility: agents who choose their own shifts within constraints have meaningfully better adherence and lower absenteeism.
• Engagement and culture: the reliable lever on external shrinkage. Unhappy operations bleed time through sickness and turnover.
• Real-time intraday management: a workforce-management team that moves resources during the day to absorb the unplanned losses the schedule did not predict.

Shrinkage frequently asked questions

What does shrinkage mean in a call center?

Shrinkage is the percentage of scheduled work time during which agents are unavailable to handle contacts. It captures everything from breaks and training to sickness and no-shows. It is the headline gap between scheduled agents and queue-available agents in workforce management.

What is the difference between internal and external shrinkage?

Internal shrinkage is time the agent is at work but not on contacts — breaks, training, meetings, after-call work overruns. External shrinkage is time the agent is not at work at all — holidays, sickness, no-shows, late starts. The split helps target where time is recoverable.

What is a good shrinkage rate?

Well-run contact centers operate around 20-25% shrinkage; the typical band is 30-35%. Anything reported under 20% usually means scheduled training or coaching has been excluded from the calculation. Above 40% is associated with poor engagement or runaway meeting overhead.

How does shrinkage affect staffing?

Erlang-based staffing math returns the number of available agents required. To turn that into a schedule, divide by (1 minus shrinkage). Underestimating shrinkage by even a few percentage points produces chronic understaffing and missed service level every interval.

See how DialPhone fits

DialPhone’s contact center reports shrinkage by interval, by team, and by reason code alongside schedule adherence, occupancy, and service level — so the workforce-management team can see exactly where time is going and target the components that are actually recoverable.