A sales capacity model translates revenue targets into the specific number of ramped and ramping reps required to hit.
Sales capacity modeling is the discipline of tying revenue targets to headcount reality: given a revenue goal, average quota, expected attainment, and realistic ramp curves, how many reps in each stage of ramp do you need at each point in the year? Most early-stage teams either skip this entirely (setting a revenue number without connecting it to sales headcount) or oversimplify it (dividing revenue by quota and hiring that many reps). Both approaches produce plans that miss badly. A proper capacity model exposes the gap between the number of reps you have, the number you need, and the timing of when hires must land to matter for the plan.
Ramped Productive Rep Months × Quota Per Rep Month × Attainment = Bookings. Rearranging: Required Ramped Rep Months = Target Bookings ÷ (Quota × Attainment). Example: $10M target, $1M annual quota per AE ($83K/month), 80% attainment expected → need $10M ÷ $67K/month = ~150 ramped rep months across the year. That's roughly 12.5 fully-ramped AE-years of capacity. If your average AE takes 4 months to ramp to full productivity, you need to translate that into a headcount and hire-date plan.
A newly hired AE typically produces: 0% quota in month 1, 25% in month 2, 50% in months 3-4, 75% in months 5-6, then 100% at month 7+. Individual ramp curves vary — inbound-heavy motions ramp faster, complex enterprise sales slower. Model each hire's contribution based on when they start. A rep hired in Q4 contributes almost nothing to the current year and 6-8 months of ramp to next year. This is why plans that call for 'hiring 6 AEs by end of Q3' often miss — those Q3 hires produce ~2 productive quarters in year 1, not 4.
Attainment is what actually happens vs. quota. Healthy sales orgs average 60-80% attainment across the team, with top performers at 120%+ and bottom performers at 30-50%. Setting the plan at 100% attainment for every rep is a fantasy that guarantees a miss. Use segmented attainment: top-tier reps 100%+, mid-tier 70-80%, ramp-year reps 40-60%. Multiply through by segment mix. This produces plan bookings that reflect realistic distribution, not aspirational uniformity.
Sales capacity is about headcount required to generate bookings. Sales pipeline coverage is about pipeline required to produce those bookings given win rates. Both must reconcile. If your capacity model says you need $10M in bookings and your win rate is 25%, you need $40M of qualified pipeline entering the year — is your marketing / SDR / rep-generated pipeline actually going to produce that? A plan that has capacity but not pipeline coverage is just as broken as one with pipeline but no capacity.
(1) Fill the capacity gap — hire earlier, use contractors, upskill CS to close expansion. (2) Improve productivity per rep — enablement, better lead quality, tooling. (3) Adjust the plan — if capacity math shows the number is unreachable, better to reset expectations early than to miss visibly. (4) Segment differently — if enterprise AEs produce $2M/year and mid-market produce $700K, moving mix toward enterprise can hit the number with fewer heads. Bring the capacity model to every quarterly business review and use it to pressure-test both the revenue plan and the hiring plan.
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