Sales capacity planning is the arithmetic connecting how many sellers you have to how much they can realistically close. Capacity is the output: the bookings the team can produce given ramp, attrition and the attainment you actually observe rather than the attainment you assigned.
The arithmetic, and the four things left out of it
The base calculation is not controversial. Productive reps, multiplied by quota, multiplied by expected attainment. Every disagreement happens inside the word productive, and inside four adjustments that get skipped because each one makes the answer smaller.
| Adjustment | What it accounts for | What skipping it produces |
|---|---|---|
| Ramp | A seller hired in March is not carrying full quota in March. Three to six months is normal for considered B2B purchases. | A plan that counts a head on the day they sign the offer letter. |
| Attrition | Voluntary and involuntary departures, plus the gap before a backfill is productive again. | Year-end capacity that assumes a January team still intact in December. |
| Attainment spread | How quota performance is distributed across the team, not its average. | A number that treats every seller as the team mean. |
| Recruiting yield | How many of the roles you approve actually get filled, and how long each takes. | Headcount in a spreadsheet that never became a person. |
Each adjustment is individually obvious. The reason they go missing together is that applying all four to an aggressive target returns a shortfall, and the shortfall has to be somebody's problem.
The average attainment number lies
Take eight sellers. Two finish the year at 180 per cent and six finish at 55 per cent. The team average is 86 per cent, which looks like a plan that nearly worked. The median is 55 per cent.
Those two numbers describe different companies. The 86 per cent version says the motion works and needs a bit more of everything. The 55 per cent version says the motion works for two people and the other six are carrying a quota nobody has shown is reachable. Build next year's capacity on the mean and you are planning to hire more of the two, which is not something hiring can do.
The binding constraint is usually recruiting, not budget
Capacity in the fourth quarter is decided in the first. A seller who needs four months to hire and five months to ramp has to be approved three quarters before the revenue is wanted. Most capacity shortfalls are discovered in month seven, at which point no amount of budget fixes them, because the constraint was never money.
This is the practical use of the model and the reason to run it early. Not to predict bookings, but to work out the last date a hiring decision can still change the outcome. After that date the plan is fixed whatever the spreadsheet says.
Run it before anybody sees the target
The cleanest test of a capacity process is sequence. Build the model with the inputs you believe, from last year's observed ramp, observed attrition and observed attainment spread, and write the output down before the board number is shared. Then compare.
If the two are close, you have a plan. If the model is well short, you now have a specific conversation: which input has to move, who owns moving it, and what happens if it does not. That conversation is useful. The version where the inputs get quietly adjusted until the model agrees is not, and everybody in the room knows which one happened.
Capacity is only the supply side
A capacity model says what the team could close if the pipeline existed to close it. It says nothing about whether that pipeline will exist, which is a separate measurement and the one most often misread as a health check. Two companies with identical capacity and different coverage are in different trouble.
It also assumes the quota it multiplies by is achievable, and that assumption belongs to the comp plan rather than the capacity model. If attainment is distributed the way the eight-seller example above is distributed, the input to fix is quota, not headcount.
When the model is not the problem
When territories are unequal. Equal quotas across unequal territories produce an attainment spread that looks like a people problem and is an assignment problem. Capacity planning cannot see this, because every seller enters the model as one unit.
When capacity is being added to cover a leak. Hiring to fix a conversion problem works out expensive, and the arithmetic hides it: more sellers through the same broken step produces more volume and the same share lost on the way through.
When the motion has not transferred yet. Capacity assumes the role is repeatable. If closing still depends on one person being in the room, the model is multiplying a number that only applies to them.
Questions people ask
What is sales capacity planning?
The arithmetic connecting seller headcount to achievable bookings, adjusted for ramp, attrition, recruiting yield and the attainment spread you actually observe.
How do you build a sales capacity model?
Start from productive reps multiplied by quota and expected attainment, then apply ramp, attrition and recruiting yield. Use last year's observed figures as the inputs, not the assumed ones.
Should you use average or median attainment?
Look at the spread. A high average carried by two overperformers hides a middle that cannot be fixed by hiring, since you cannot recruit for the tail of a distribution.
When should capacity planning happen?
Early enough that hiring decisions can still change the result. Time to hire plus ramp usually means roles must be approved two or three quarters before the revenue is needed.
What does a capacity model not tell you?
Whether the pipeline will exist to work. Capacity is the supply side; coverage and conversion are separate measurements and a capacity model is blind to both.
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