Translate the market story into a selling capacity.
A sales-led SOM estimates how many accounts the organization could win over a stated horizon, then caps that count at the available market. It makes sales productivity and hiring assumptions visible instead of hiding them in a capture percentage.
Productive-equivalent headcount should already reflect ramp and attrition. This model assumes won customers remain through the horizon. Its revenue output is the annual run rate at the horizon, not the cumulative revenue recognized along the way.
The formula, made clear.
- Productive reps
- Average full-productivity equivalents, allowing fractional values.
- Horizon run rate
- Annualized recurring revenue from the accumulated retained accounts at the end.
Put the numbers in context.
Five productive reps winning 20 accounts each year for three years can reach 300 accounts. At $24,000.00 ACV that is a $7,200,000.00 annual run rate.
| Input | Example value |
|---|---|
| Fully productive sales reps | 5 people |
| Annual wins per productive rep | 20 customers |
| Planning horizon | 3 years |
| Serviceable available accounts | 2,000 customers |
| Annual value per account | $24,000.00 |
| Annual run rate at the horizon | $7,200,000.00 |
What this calculation assumes
Constant productive capacity, sufficient pipeline, no customer churn and no competing use of sales effort. Counts may be fractional planning expectations. The market cap limits accounts, not the timing of wins.
What to consider next.
Use the sales ramp model to justify productive-equivalent headcount, then add churn and collections to the operating plan.
How we approach financial models →