What is the hour capacity model?

An hour capacity model calculates the total available billable hours from the workforce based on headcount, work hours, and expected non-billable time, providing a foundation for revenue planning and resource decisions. For professional service firms, capacity modeling ensures realistic planning and identifies when additional resources are needed.

Key characteristics

• Calculates total available billable hours

• Based on headcount and work patterns

• Accounts for non-billable time

• Foundation for revenue planning

• Identifies capacity constraints

• Should be updated as headcount changes

Why it matters for professional service firms

Revenue is constrained by capacity. An hour capacity model quantifies maximum revenue potential and identifies when additional resources are needed. Professional service firms should maintain capacity models, comparing demand to available hours and planning resource additions before capacity constraints occur.

Real-world example

Rachel's firm had 12 consultants without a formal capacity model. Hour capacity model: 12 consultants times 2,080 work hours minus 320 non-billable (PTO, training, admin) equals 21,120 billable hour capacity. At a target utilization of 85%, 17,952 billable hours are available. At a $ 175-a-blended rate, $3.14M in revenue capacity. Current demand: $3.0M (95% of capacity). The model showed: near capacity constraint, needed to add a consultant if growth continued, or risk turning away work. Hire decision made proactively based on a capacity model rather than reactively when work was lost.