Everhour tracks time and approved leave together, so utilization math can use the same capacity policy every reporting period.
Measure billable utilization against total capacity and see exactly how many hours you're leaving on the table each period.
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Utilization rate answers a simple services-operations question: how much of a person's or team's available time turned into billable work. The standard formula is billable hours divided by available hours, multiplied by 100. The result is a percentage, but the percentage only has meaning when you name the denominator: gross capacity, net working capacity, or total logged time.
For U.S. teams, the denominator is a firm policy choice. The FLSA does not define full-time or part-time employment, and U.S. federal sources do not set a professional-services utilization target. Many firms start with 40 weekly hours because federal overtime rules require covered nonexempt employees to receive overtime pay for hours worked over 40 in a fixed 168-hour workweek.
A 40-hour weekly capacity baseline equals 2,080 gross annual hours before company PTO, holidays, unpaid leave, or other nonworking time. That gross baseline is useful for staffing plans, but it can distort utilization when a person takes approved leave. Net working capacity subtracts leave that the person was not available to work.
Private-sector paid leave is still a policy matter unless another law, contract, or jurisdiction rule applies. The FLSA does not require payment for time not worked, including vacations, sick leave, or federal or other holidays. OPM lists 11 federal holidays in 2026 for federal employees, while private-sector paid holidays remain an employer policy choice unless another rule applies.
Use this formula: utilization rate = billable hours ÷ available hours × 100. If Sam records 28 billable hours in a week and the firm uses a 40-hour gross capacity denominator, Sam's utilization rate is 70%. If Sam had 8 hours of approved leave that same week, a net-working-hours denominator is 32 hours, making the rate 87.5%.
Both numbers are mathematically correct because they answer different questions. The 70% figure compares billable hours with gross weekly capacity. The 87.5% figure compares billable hours with the hours Sam was actually available after approved leave. A report that mixes those denominator policies across people will rank availability differences as performance differences.
Utilization is not realization, efficiency, productivity, or capacity utilization in every context. Utilization usually means billable hours divided by available hours in a services business. Realization compares billed or collected value with standard billable value. Efficiency compares output with input. Productivity compares completed work with time, cost, or another resource.
Capacity utilization also has two common meanings. In professional services, it often overlaps with billable utilization against capacity. In economics or manufacturing, it usually compares actual output with potential output. Before you compare rates across teams or sources, confirm the numerator and denominator instead of treating every utilization percentage as the same metric.
A one-off utilization calculation is enough for checking a single week, validating a spreadsheet, or explaining why one person's rate changed after PTO. The calculation becomes weaker when teams need recurring comparisons by person, role, project, or service line. Repeated reporting needs a stable denominator policy and clean billable versus non-billable classification.
A managed workflow becomes necessary when approved leave, holidays, capacity changes, and billing status all feed the same metric. Everhour Time Off can track vacations, sick leave, holidays, and custom leave types alongside work time, so time-off data flows into timesheets and reports instead of living in a separate spreadsheet.
This content is for general information only, may not be fully up to date, and is provided without any warranty or liability.
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The basic utilization rate formula is billable hours divided by available hours, multiplied by 100. A person with 30 billable hours and 40 available hours has a 75% utilization rate. The result changes when available hours mean net working capacity instead of gross capacity, so every utilization figure should name its denominator.
A U.S. firm should define available hours through its own capacity policy. The FLSA does not define full-time or part-time employment, and BLS 35+ hours per week is a statistical definition, not a legal one. Many firms use 40 weekly hours as gross capacity, then subtract policy-based PTO, holidays, and approved leave for net working capacity.
PTO can make utilization look higher when the denominator changes from gross capacity to net working capacity. A person with 28 billable hours, 40 gross hours, and 8 hours of approved leave has 70% gross utilization and 87.5% net utilization. The billable work stayed the same; the available-hours denominator changed.
Utilization rate is not the same as realization rate. Utilization compares billable hours with available hours. Realization compares billed or collected value with the standard billable value of the work. A consultant can have high utilization and weak realization if many billable hours are discounted, written off, or billed below the standard rate.
The United States does not set a statutory professional-services utilization target. U.S. federal sources define certain work-hour and leave rules, but target utilization is a firm, role, service-line, or industry benchmark choice. Delivery roles often need different targets than managers, sales-support staff, or employees with formal non-billable responsibilities.
Everhour Time Off tracks vacations, sick leave, holidays, and custom leave types alongside tracked work time. Approved time off flows into timesheets and reports, which lets teams compare billable hours with capacity after leave instead of manually subtracting absences from a separate calendar.
Track approved leave and work time in one place so recurring utilization reports use the same denominator policy. Everhour Time Off keeps absences visible in timesheets and reports for cleaner capacity decisions.
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