Sales capacity planning is the framework for translating a revenue target into a hiring plan: how many reps, in which roles, hired by when, with what ramp, to produce the bookings number. Done well, it is a defensible bottom-up build that survives a CFO review. Done poorly, it is a top-down “we need to grow 50 percent so let’s hire 50 percent more” calculation that misses by a quarter and a half.
The framework
A complete capacity model has six layers:
- Productivity per fully-ramped rep. ARR a tenured AE produces per year. Use trailing-12 actuals, not quota.
- Ramp curve. What fraction of full productivity a new rep produces in months 1, 2, 3, 4, 5, 6. Typical: 0%, 15%, 30%, 50%, 70%, 90%, then 100% from month 7.
- Attrition assumption. Annual rep attrition by segment. SMB AEs churn at 30 to 40 percent; enterprise at 15 to 25 percent.
- Coverage ratios. SDRs per AE, sales engineers per AE, CSMs per AE. Pulled from your existing motion data.
- Time to hire. Calendar time from approving a req to a butt in seat. Typical: 60 to 90 days for AEs, 30 to 60 for SDRs.
- Quota over-assignment. Sum of individual quotas as a multiple of company target. Typical: 1.15x to 1.25x.
The build
Start with the bookings target and work backwards:
Required ramped headcount = bookings target / (productivity × over-assignment)Then layer in time:
- For each quarter of the year, compute “ramped productivity available” by summing each rep’s individual ramp progress at that point.
- Subtract ramped productivity from the quarterly target to find the gap.
- Convert the gap into hires, accounting for hiring lead time and ramp curve.
A team needing $40M of new ARR with $1.2M productivity per rep and 1.2x over-assignment needs 28 fully-ramped equivalents. After modeling ramp and attrition, that often translates to hiring 12 to 15 net AEs through the year — concentrated in Q1 and Q2 so they ramp by Q3 and Q4.
Sanity checks
A model that does not pass these checks is wishful:
- Are you hiring faster than you ever have? A team that hired 4 AEs last year planning 18 this year has a recruiting problem before it has a sales problem.
- Is implied productivity above your actuals? If your model assumes $1.5M per rep but trailing-12 is $900K, you are not modeling, you are guessing.
- Have you accounted for management ratio? Adding 10 AEs without 1 to 2 frontline managers degrades productivity 15 to 25 percent.
- What is your SDR-to-AE pipeline coverage assumption? Hiring AEs without proportional SDR or marketing spend means under-fed reps.
Common pitfalls
- Quota-as-productivity. Quota is the goal; productivity is what reps actually produce. They diverge by 10 to 30 percent. Model on actuals.
- Ignoring attrition until December. A 20 percent attrition rate means a 30-rep team needs 6 hires just to stand still.
- Linear ramp. Real ramp is S-shaped, not linear. Use a real curve from your data.
Related
- Quota coverage — the demand-side input to capacity
- Territory design — how the headcount gets allocated