What Is Call Center Shrinkage? Formula, Benchmarks & How to Reduce It

Key Takeaways

• Call center shrinkage measures the percentage of paid agent hours that are unavailable for customer interactions,covering breaks, training, absenteeism, meetings, and system downtime.
• The shrinkage call center formula is the same whether you run an in-house team or a BPO: Shrinkage % = (Unproductive Hours ÷ Scheduled Hours) × 100. Knowing how to calculate shrinkage in call center operations is the first step, but splitting it into planned vs. unplanned is what makes the number actionable.
• Average shrinkage in call center operations sits around 30–35% globally, but the right call center shrinkage benchmark depends on your channel mix, industry, and geography.
• Unplanned shrinkage (absenteeism, no-shows, system outages) is the metric that typically wrecks service levels — and it's the one most worth tracking separately.
• Reducing shrinkage isn't about eliminating breaks; it's about cutting unnecessary unproductive time through better scheduling, engagement, and automation.

Introduction

One of the most significant priorities of a contact center is reducing and monitoring call center shrinkage.
The best contact center managers are laser-focused on managing resources efficiently and keeping customers happy. In the call center industry, the customer experience is a reflection of how the agents respond to calls and attend to customer needs. If a certain contact center has a reputation for not being responsive or not being able to adequately address their needs, customers may leave for greener pastures.
Taking your contact center to the next level starts with understanding call center shrinkage and what you can do to mitigate it. Keep reading this guide to learn more about call center shrinkage, what it is, how to calculate it, and why it matters.

Define What is Call center shrinkage?

Call center shrinkage occurs when agents are being paid but are unable to respond to customer queries. Some shrinkage is planned — like training teams and having holiday parties. Other shrinkage is unplanned — like an agent calling in sick or taking time off on vacation.

In an ideal call center setup, shrinkage is minimized; after all, some level of shrinkage is unavoidable. In these well-run operations, agents are at their desks, managing digital channels and answering calls as much as possible.

Call center shrinkage measures agent productivity and helps determine how much time agents spend working on tasks that fall outside the scope of helping customers. Depending on the factors that influence it, shrinkage can stem from external or internal sources.

1. External shrinkage

External shrinkage refers to activities that prevent employees from answering customer phone calls that are more or less outside the organization’s control. Some of these examples include:

• Lateness
• Sickness
• Holidays
• Paid breaks (which depend on shift times)

Controlling or eliminating some factors that contribute to external shrinkage is only possible if the root of the problems is effectively addressed. For example, if an agent is routinely late, managers should explain why that behavior is unacceptable. If it persists, the manager may want to look for a replacement who will show up on time. Additionally, while holidays, breaks, and vacations can’t be eliminated, managers can monitor them to ensure that agents adhere to the proposed guidelines.

2. Internal shrinkage

Internal shrinkage occurs when call center agents are at work but aren’t available to answer calls due to any number of reasons, including:

• Unplanned facility issues
• System downtime
• Meetings
• Coaching and training sessions

Managers can have control over these factors because most are predictable parts of the typical workday.

How to calculate call center shrinkage?

Call center shrinkage can be calculated based on two different metrics: time and number of call center agents.
Use this equation to calculate call center shrinkage by time:
Shrinkage % =( Total hours of external shrinkage + Total hours of internal shrinkage)/ Total hours available×100%

Imagine the external and internal shrinkage hours are 4 and 2, and the call center agent works 12 hours a day. The shrinkage percentage will be [(4+2)/12] × 100%, which is equivalent to 50%.

Use this equation to calculate call center shrinkage by number of agents:
Shrinkage % = (Number of call center agents required to take calls)/Number of agents available to answer calls ×100%

Suppose the number of call center agents required to achieve the service level target is 40, and the number of available agents is only 20. The shrinkage percentage will be 40/20 × 100% = 200%.

In most cases, it’s advisable to use the number of agents formula to determine your base staff requirements to meet business goals. While this formula can help build a capacity plan based on shrinkage, it won’t increase the call center efficiency. That’s where the calculation based on time can be particularly helpful in identifying factors that prevent agents from being more productive.

Shrinkage Formula in BPO: Is It Different from Call Centers?

If you're reading this from a BPO perspective, you're probably wondering whether the rules change. So what is shrinkage formula in BPO, and does it differ from the call center version?

The short answer: the math is identical, but the context is different. A BPO usually operates across multiple clients, time zones, and SLAs simultaneously, which means shrinkage hits harder and needs tighter monitoring. Understanding what is shrinkage in BPO is really about understanding what the number signals in a multi-client environment, not about learning a different formula.

The shrinkage formula in BPO is:

Shrinkage % = (Total Unproductive Hours ÷ Total Scheduled Hours) × 100

That's the same shrinkage call center formula shown earlier only the operating context changes.

Shrinkage Formula in BPO With Example

Here's how to calculate shrinkage in BPO with a realistic scenario:

Scenario: A BPO serves a retail client with 80 agents rostered Monday–Saturday on 9-hour shifts.

• Total Scheduled Hours per week = 80 × 9 × 6 = 4,320 hours

Across the week, the WFM team logs the following lost time

Plugging in:

Shrinkage % = (1,140 ÷ 4,320) × 100 = 26.4%

So this BPO's weekly shrinkage is 26.4% — comfortably below the global average.

Why should you care about call center shrinkage?

There’s a reason top-performing contact center managers track call center shrinkage: it helps improve contact center efficiency.

Across the world, the average call center shrinkage rate hovers between 30% and 35%. Anything above 35% indicates that very few call center agents are available to help customers, which may result in longer wait and hold times, which hurts customer satisfaction. Very simply, shrinkage dramatically influences the number of staff required to meet service levels.

At the same time, shrinkage is also a good indicator of a call center’s productivity; generally, high shrinkage means low productivity while low shrinkage implies high productivity.

Moreover, finding out that your call center shrinkage rate is exceptionally high can inspire you to look at the reasons behind it. You may discover that call center agents are wasting time on unnecessary activities — like being late constantly, having too many meetings, and taking excessive breaks. Whatever the reason is, resolving it can bring about a significant change in the call center shrinkage rate — much to the delight of your customers.

Generally, calculating call center shrinkage percentage can help managers decide the ideal number of agents needed to handle incoming calls and meet predefined service goals. To ensure they’re able to meet staffing requirements and operate their call center as efficiently as possible, managers must regularly monitor and track this metric.

Call Center Shrinkage Benchmarks by Industry

The existing article notes that average shrinkage in call center operations sits between 30% and 35%. That's a useful global reference, but the "right" number depends heavily on what kind of operation you run. Here's a more granular call center shrinkage benchmark view:

Three factors explain most of the variation in contact centre shrinkage:

1. Channel complexity — voice operations typically run higher than chat or email because voice work is more cognitively demanding and needs more recovery time between contacts.
2. Training load — newer teams and operations with high attrition burn significantly more hours on training, which inflates internal shrinkage.
3. Geography and labor laws — statutory break requirements vary by market and directly affect the productive-hours ceiling.

If your number sits outside the typical range for your segment, the next step is diagnosing where it's coming from — which is where a proper calculator earns its keep.
How to Reduce Call Center Shrinkage? The existing article makes the case for why shrinkage matters. Here's how to actually bring the number down:

1. Forecast shrinkage into your capacity model, don't bolt it on afterward. If you regularly lose 30% of paid hours, staff against 70% productive capacity — not 100% with a hope and a prayer.

2. Separate planned from unplanned on every report. Most leaders chase the wrong half. Planned shrinkage is a scheduling decision; unplanned shrinkage is a people and infrastructure problem.

3. Attack unplanned absenteeism at the root. Chronic Monday absenteeism usually means disengagement, burnout, or shift design issues — not a discipline problem. Fix the cause, not the symptom.

4. Tighten schedule adherence without micro-managing. Real-time adherence dashboards catch late log-ins, extended breaks, and unauthorized AUX time before they compound into a full-shift problem.

5. Use automation to protect productive hours. Tasks like post-call wrap-up, disposition tagging, and call summaries often eat 10–20% of an agent's paid time. Automating them directly reduces internal shrinkage without cutting anything agents actually value.

6. Coach on the drivers, not the metric. Shrinkage is a lagging indicator. The leading indicators — engagement, first call resolution, confidence on complex queries — are what coaching should actually target. Effective agent coaching addresses these drivers directly.

7. Invest in real-time visibility. Waiting until end-of-week reports to see shrinkage spikes is too late. Real-time call center performance monitoring lets supervisors intervene the same day, not the same quarter.

Frequently Asked Questions

Q1. What is shrinkage in BPO in simple terms?
Shrinkage in BPO is the percentage of paid agent hours that aren't spent handling customer contacts — covering breaks, training, absenteeism, meetings, and system downtime. If you pay an agent for 9 hours but only 6 are spent on live customer work, shrinkage for that shift is roughly 33%

Q2. What is the shrinkage formula in BPO?
The shrinkage formula in BPO is: Shrinkage % = (Total Unproductive Hours ÷ Total Scheduled Hours) × 100. For a more actionable view, calculate planned and unplanned shrinkage separately using the same formula, but with only the relevant hours in the numerator.

Q3. How do you calculate shrinkage in call center operations quickly?

Add up all paid hours when agents weren't available for contacts (breaks, training, absences, downtime), divide by total scheduled hours, and multiply by 100. If 80 agents are scheduled for 4,320 hours and 1,140 hours are unproductive, shrinkage = (1,140 ÷ 4,320) × 100 = 26.4%. That's how to calculate shrinkage in BPO and call center environments alike — the formula doesn't change.

Q4. What is a good call center shrinkage benchmark?

A healthy contact centre shrinkage benchmark sits between 30% and 35% for most inbound operations. Outbound sales teams often run leaner (25–30%), while technical support and healthcare tend higher (33–40%) due to longer training cycles. Anything consistently above 40% warrants investigation into unplanned absenteeism and schedule adherence.

5. What is external shrinkage in BPO, and how is it different from internal shrinkage?

External shrinkage covers time lost to factors outside your schedule — absenteeism, lateness, no-shows, and system outages. Internal shrinkage covers non-productive time from scheduled activities — breaks, meetings, coaching, training. They require different fixes: internal shrinkage is solved through better scheduling and meeting discipline, while external shrinkage needs engagement, attendance policies, and infrastructure investment