Sales Efficiency Ratio
New revenue produced per unit of sales and marketing spend, in one of several closely related formulations.
Formulation matters
Gross or net of churn, revenue or ARR, lagged or contemporaneous spend — each choice materially changes the number. Comparing your ratio to a published figure without matching definitions compares nothing.
Consistency beats correctness
How to compute one you can defend
Pick a variant and write it down: net new ARR over S&M spend, gross new over spend, or an annualised quarterly version. They give different answers and share a name.
Decide the lag. Spend in one period produces revenue in a later one, and ignoring that flatters a business cutting spend.
Use net rather than gross revenue where possible, so churn is not invisible in an efficiency measure.
Compute it over several quarters. Single-period figures are dominated by deal timing.
Report the variant name alongside the number every time. Most disagreements about sales efficiency are definitional.
Where it misleads
The variants differ enough that two teams can report sales efficiency and be measuring different things without either being wrong.
It cannot separate new business from expansion, so a business whose growth comes from its existing base looks more efficient at acquisition than it is.
Deliberate investment ahead of revenue depresses it correctly and unhelpfully — the metric cannot distinguish waste from a bet.
It ignores gross margin entirely, so two businesses with identical ratios can have very different unit economics.
RELATED TERMS
Magic Number
A sales efficiency measure comparing new recurring revenue produced to the sales and marketing spend that produced it.
Customer Acquisition Cost (CAC)
The fully loaded cost of acquiring one new customer: sales and marketing spend for a period divided by new customers acquired from it.
CAC Payback Period
How long it takes for a customer's gross profit to repay the cost of acquiring them. The bridge between sales efficiency and cash flow.
Burn Multiple
Net cash burned divided by net new ARR added — how much cash is consumed to produce a unit of recurring revenue.
COMMON QUESTIONS
- What is the sales efficiency ratio?
- New revenue produced per unit of sales and marketing spend. Several closely related variants share the name — the magic number is one of them — and they use different numerators and lags, which is why two reported figures frequently disagree without either being wrong.
- How is it different from the magic number?
- The magic number is a specific variant: the quarterly change in ARR, annualised, divided by prior-quarter sales and marketing spend. Sales efficiency is the broader family. If someone quotes a sales efficiency ratio without stating the variant, the number is not comparable to anything.
- What is a good sales efficiency ratio?
- Above 1 generally means you are adding more annualised revenue than you spent acquiring it, which is a strong position. The commonly quoted thresholds are operating conventions rather than measured optima, so treat them as a frame and compare against your own trend over several quarters.
- Should it use gross or net new revenue?
- Net where you can, so churn is visible inside the efficiency measure. Using gross new revenue removes retention from the picture entirely, which means a business losing customers as fast as it wins them can post a respectable efficiency ratio while going nowhere.
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