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Customer success capacity planner

Model monthly workload by customer lifecycle, compare staffing scenarios, and take a workload sampling sheet into your next planning cycle.

01 · Segment the portfolio

Each customer belongs in one segment. All starting values are fictional examples, not industry benchmarks.

Onboarding
Stable
At risk

02 · Set team assumptions

Available hours already exclude leave, management, and administration. Include shared delivery programs once; the buffer covers work not already counted. Inputs stay in this tab and are not sent to the site.

Compare the staffing scenarios

Variation changes customer delivery hours. Shared programs, the buffer, and hours per FTE stay fixed. This is sensitivity analysis, not a forecast or confidence interval.

ScenarioHoursRequired FTEFTE gapWhole roles to add

A negative gap means modeled spare capacity. Rounding a positive gap up assumes indivisible full delivery roles; part-time capacity or service redesign may change the decision.

Sample the work before changing headcount

  1. Choose a representative window. Record four weeks covering onboarding, stable accounts, risk work, and shared programs. Include normal and busy weeks; record absences separately.
  2. Capture total customer work. Include meetings, preparation, follow-up, and escalations. Assign work to one mutually exclusive lifecycle segment. Keep identifiable customer records in approved internal systems.
  3. Use customer-month exposure. Divide segment hours by the customer-months represented. Twenty customers observed for half a month represent ten customer-months; do not divide only by accounts that requested meetings.
  4. Reconcile the hours. Compare logged work with available delivery hours. Missing work is an uncertainty, not free capacity. Separate shared programs to avoid counting them per customer as well.
  5. Review outcomes. A lower workload is useful only if service promises and customer outcomes hold. Repeat the sample after any service-model change.

Download workload sampling sheet ↓ Download editable Excel workbook ↓

Worked example: a gap worth investigating

The fictional starting portfolio needs 300 customer hours plus 40 shared hours. A 15% buffer produces 391 hours, or 3.55 FTE at 110 available hours per person. Compared with 2.5 current FTE, the gap is 1.05 FTE. At ±25% customer workload, requirements range from 2.77 to 4.34 FTE. None of those figures alone proves that two hires are the right action.

What this model cannot tell you

Monthly totals can conceal weekly peaks, specialist bottlenecks, onboarding deadlines, and uneven workload allocation. The model does not infer causal effects on retention or prescribe a customers-per-CSM ratio. Reconcile the scenario with observed work, required skills, and service commitments.

Read the fictional capacity decision → · Check customer outcomes →