Capacity planning converts people, calendars and demand into decisions about staffing, hiring and sales. In a consulting firm the challenge is not simply counting employees: skills, grades, part-time arrangements, leave, non-billable responsibilities and project timing determine whether capacity can actually satisfy demand.
Choose the planning horizon and unit
Use weekly capacity for the next 8 to 13 weeks and monthly capacity for the following quarters. Plan in hours or days, not headcount, and keep a view by practice, role and critical skill. A company-wide total can look balanced while one specialist team is overloaded.
Define calendar capacity as working time after public holidays, contract hours and known leave. Then reserve realistic time for management, internal work, learning and sales support. The remainder is potential delivery capacity, not a promise of billable demand.
Calculate supply consistently
A simple formula is: available delivery hours = calendar hours − leave − committed internal time − confirmed project allocation. Apply it to each person and aggregate only comparable skills and periods. Record tentative assignments separately so users can see contention.
Do not set every consultant to a theoretical 100 percent. Sustainable plans need buffers for handovers, short gaps, quality work and uncertainty. The right buffer depends on the firm's model and should be tested against actual delivery, not copied from a generic benchmark.
Model demand by confidence
Separate signed backlog, highly probable extensions and weighted sales pipeline. For opportunities, estimate required roles, start window, duration and weekly effort; a deal value alone cannot drive staffing. Keep the unweighted scenario visible because probabilities do not allocate people.
Use at least three views: committed demand, expected demand and upside demand. If hiring is justified only in the upside case, leadership should know that. The sales pipeline guide explains how to improve the inputs.
Find gaps by skill and time
For each period calculate capacity gap = demand hours − available delivery hours. Positive values indicate shortage; negative values indicate potential bench. Break the gap down by role and skill before choosing an action.
A shortage four months away may justify hiring. A two-week peak may be better handled through sequencing, subcontracting, cross-training or scope negotiation. Likewise, apparent excess capacity may be unavailable to a project because of language, location, rate or experience.
Turn scenarios into decisions
Create scenarios for delayed start, lower win probability, partial extension, planned leave and recruitment lead time. Show the operational and economic effects: utilization range, subcontractor spend, delivery risk and potential revenue that cannot be staffed.
Assign actions with triggers. For example, begin recruiting when signed plus highly probable demand exceeds available capacity for a sustained period, not simply when one large opportunity enters the pipeline. State the trigger explicitly and review it weekly.
Run a weekly capacity meeting
The meeting should focus on exceptions and choices, not rebuilding spreadsheets. Review newly signed work, changed dates, overloaded people, unstaffed demand, upcoming releases and decisions awaiting sales or delivery. Every exception needs an owner and a next review date.
Keep a decision log so forecasts can improve. When a project starts late or requires a different mix, update the demand model and record why. Over time this reveals systematic optimism, missing skills and practices that need a different buffer.
Measure forecast quality
Compare forecast demand with actual staffed effort by horizon, practice and confidence stage. Track staffing lead time, avoidable double bookings, unfilled demand, bench duration and the share of profiles with current skill data.
The goal is not a perfect forecast. It is earlier, better decisions under uncertainty. A useful capacity model makes assumptions visible, connects aggregate gaps to named work and gives leaders time to hire, develop, partner or sell differently.
Utilization: what it measures and what it hides
Utilization is the most used and least understood indicator in the sector. Without defining the denominator it means nothing: billable hours over calendar hours, over working hours, or over hours available after management and training can differ by twenty points. Write the formula, publish it and do not change it mid-year.
A high utilization figure is also not always good news. It can mean healthy demand, or it can mean the team is covering headcount gaps, nobody has time to prepare proposals and the next absence becomes a crisis. Read it alongside three other things: sustained overtime, regretted attrition and the share of delivered work still unbilled.
Connecting the plan to hiring
A capacity plan only matters if someone converts it into decisions with enough lead time. Recruiting a scarce senior profile can take two to four months across search, process, notice period and ramp-up, and that period must be subtracted from the date the person needs to be productive. A gap spotted in March for a June need is already late if the profile is hard.
The plan should therefore produce three short, actionable lists every month: profiles to open in recruiting with a deadline, gaps to be covered by partners or contractors, and people with predictable bench who need commercial action before it happens. Without those three lists, capacity planning stays a tidy report that nobody uses to decide.