Shrinkage

How to calculate shrinkage

Add up every hour that agents are paid for but cannot take a contact, then divide by total paid hours. Most workforce teams calculate it by category and by interval, because a single blended number is not enough to build a schedule. Breaks cluster mid-shift, training runs on weekday mornings, and sickness peaks on Mondays and the day after a holiday.

There are two common bases, and mixing them causes planning errors:

• Interval or scheduled-day shrinkage only covers people who were scheduled that day: breaks, meetings, coaching, lateness, sickness.
• Total roster shrinkage also includes full days away like vacation, holidays and long-term leave.

When you convert required agents into a schedule, use interval shrinkage. When you convert a schedule into total headcount to hire, use roster shrinkage. Use the formula above with the right base for the question you are answering.

Planned vs unplanned shrinkage

Planned shrinkage is time you know about in advance and can schedule around: paid breaks, lunches if paid, team huddles, one-to-one coaching, refresher training, quality calibration sessions, system downtime windows, vacation and public holidays.

Unplanned shrinkage is time you lose without warning: sick calls, absenteeism without notice, lateness, early departures, extended breaks, technical outages at a home agent's desk and personal emergencies. Poor schedule adherence also shows up here, as agents who are logged in but in the wrong state at the wrong time.

The split matters because you manage them differently. Planned shrinkage is a design decision; you can move training to quiet intervals. Unplanned shrinkage is a people and culture problem, and the answer is usually in supervision, scheduling flexibility and attendance policy rather than in the WFM tool.

Typical shrinkage ranges

Total roster shrinkage in US inbound contact centers commonly falls between 30% and 35%. Interval shrinkage on a scheduled day is often 15% to 25%. Ranges vary a lot by industry, benefits and workforce:

• Centers with generous paid leave and heavy compliance training (banking, healthcare) often run 35% or above.
• New-hire classes in nesting carry extra coaching and lower readiness, so their effective shrinkage is higher for the first 60 to 90 days.
• Work-at-home teams often see lower lateness but more short technical outages.
• Seasonal peaks raise sickness and no-shows at exactly the moment you can least afford them.

If someone quotes you 15% total shrinkage, ask what is missing. It is usually vacation or training.

Why shrinkage matters for hiring plans

Shrinkage is the bridge between workforce math and recruiting targets. Underestimate it by five points on a 400-agent operation and you are roughly 30 agents short before attrition is even counted. That gap usually lands on recruiting as an urgent extra class, and on the floor as overtime and long queues.

When building a hiring plan, layer it in this order: required agents from the staffing model, divide by (1 − interval shrinkage), convert to FTE with shift length, divide by (1 − roster shrinkage), then add expected attrition and training dropout for the period. Each layer is a separate assumption, and each should be checked against actuals every month. For the next step up, see occupancy, which tells you whether the agents who were available were actually busy.

Common shrinkage mistakes

• Adding shrinkage instead of dividing. 60 agents × 1.31 = 79, not 87. Multiplying understates the need, and the error grows with higher shrinkage.
• One number for every interval. Sickness on a Monday 8 a.m. interval is not the same as on a Wednesday afternoon.
• Leaving out new-hire effects. Agents in nesting take longer calls and need more floor support.
• Hiding shrinkage in AHT. Some teams let agents sit in after-call work for personal time, which inflates handle time and makes shrinkage look better than it is.
• Cutting coaching to hit a shrinkage target. It works for one quarter, then quality and attrition pay for it.

How to reduce shrinkage without hurting agents

Go after unplanned shrinkage first. Shift-swap and partial-day leave tools let agents handle a dentist appointment without calling in sick for a whole day. Clear, consistently enforced attendance rules help, but a punitive point system on its own tends to push people out the door rather than into the seat.

On the planned side, schedule training and coaching into the quietest intervals of the week, and use intraday triggers to pull them forward when volume drops. Keep breaks protected. Agents who cannot get a break when they need one tend to take one anyway, usually in after-call work, which is the hardest kind of shrinkage to see.