Employees lose 1 in 5 workdays to exhaustion and stress, new research finds

New research from thrive at work finds employees report not working effectively on 48.5 days a year on average, with the gap between the highest- and lowest-capacity workers reaching 71 days. The findings frame capacity as a measurable driver of payroll time and sustainable performance.

Why it matters: - Employees who are exhausted or stressed but still at work report 48.5 days a year of not working effectively, equal to about 1 working day in 5. - At an average US private-sector labor cost of $46.89 an hour, that adds up to about $375 for an 8-hour day. - The average across 1,000 employees equals about 48,500 days, or roughly $18.2 million of payroll time. - The gap between employees with the lowest and highest capacity is 71 days a year, about $26,600 in payroll time per employee.

What happened: - thrive at work released new research on employee capacity and presenteeism on Nov. 4, 2026. - The quarter of employees with the least capacity reported 85 days a year of not working effectively. - The quarter with the most capacity reported 14 such days a year. - The difference between those groups equals nearly 4 working days in 10 versus about 1 in 16.

The details: - Presenteeism means being at work but not working effectively. - Capacity measures energy, recovery, focus and resilience. - The least-capacity quarter reports 39% of a 220-day working year as ineffective work days. - The highest-capacity quarter reports 6%. - Removing the three most similar items from the capacity score still leaves a 70-day gap. - Under more conservative ways of converting responses, the gap ranges from 52 to 65 days, or about $19,500 to $24,400. - A 54-day spread appears on workload sustainability, manager support and sleep duration, equal to nearly 11, 11 and 10 working weeks. - Those three 54-, 54- and 49-day differences translate to about $20,300, $20,300 and $18,400 of payroll time. - Retail employees report 66 days a year of not working effectively, 24 more than transport and logistics workers at 42 days. - That retail-transport gap equals nearly 5 working weeks and about $8,900 of payroll time. - The research program covered 7,031 employees and 216,301 responses across Europe and North America. - The days not working effectively came from a sample asked how many days in the past month exhaustion or stress left them unable to work effectively. - The research compares groups at one point in time, and the days are employees' own answers, not employer records. - Capacity is measured with a behavior-anchored survey informed by biomarker and physiological research, without collecting biometric data. - In a 12-month study, survey answers tracked resting heart rate and heart rate variability. - When a person's capacity changed, heart rate variability changed with it.

Between the lines: - The research treats capacity as a separate workforce metric from engagement. - Engagement explains about 17% of the differences between employees in days not working effectively. - Adding capacity lifts that explanation to 43%. - With engagement held equal, each point of capacity corresponds to 1.9 fewer days a year, about three times the effect of a point of engagement. - A 10% increase in capacity goes with about 19 fewer days, or about $7,100 in payroll time. - Closing half the distance from the sample average to the top quarter on capacity goes with about 16 fewer days and about $6,000 per employee. - The World Health Organization and the International Labour Organization describe work-related psychosocial risk as a major occupational health burden. - Jerry Fišer, founder of thrive at work, said an employer pays for every working day, including days when people cannot work effectively. - Fišer also said an engagement survey does not show how many of those days there are, but capacity does.

What's next: - thrive at work is directing readers to its Scientific Foundations White Paper. - The company says organizations use its platform to measure workforce capacity and engagement, identify performance constraints and turn the data into action plans and personalized learning. - thrive at work says its research focuses on four dimensions of capacity: energy, recovery, focus and resilience.

The bottom line: - The research argues that lost effectiveness at work is measurable, expensive and unevenly distributed across employees.