Bessemer CAC Ratio
Bessemer's measure of sales-and-marketing efficiency: the gross-margin-adjusted net new ARR generated in a period divided by the sales-and-marketing spend of the prior period that produced it.
◆ Ratio
Formula
Built from
What it measures
How much durable, margin-adjusted recurring revenue each dollar of sales and marketing buys. The numerator is the period's net new ARR multiplied by gross margin, so it counts only the contribution that survives the cost of delivering the product. The denominator is the prior period's S&M spend, because the spend that wins a customer is incurred before that customer's revenue lands. The result is unit-agnostic: it judges the whole acquisition engine without normalizing by customer or logo count.
Why it matters
Boards and growth investors lean on the CAC Ratio to answer one question: is this company buying growth efficiently enough to fund it? Because it folds gross margin into the numerator and lags the spend, it is closer to a true return-on-S&M than headline bookings ratios. A ratio comfortably above 1.0 means the company earns back its acquisition cost inside a year and can press the accelerator; a ratio drifting below it means every incremental dollar of growth is getting more expensive, which caps how fast the business can scale without burning cash.
How to read it
Read the CAC Ratio as a payback signal, not just a productivity score. A ratio of 1.0 means you recover a year's worth of gross-margin revenue for every dollar of prior-period S&M — roughly one-year payback. Above 1.0, growth is paying for itself and you can invest more; below 0.5, the engine is leaking and adding spend will only deepen the burn. Always read it as a trend across several periods rather than a single quarter, and pair it with the magic number and burn multiple: a falling CAC Ratio can hide either shrinking net new ARR or a margin squeeze, not just rising spend, and only the components tell you which.
What good looks like
Good
CAC Ratio > 1.0: each dollar of prior-period S&M spend returned more than a dollar of gross-margin-adjusted ARR, so the company recoups its acquisition cost in under a year — a sign of strong, fundable efficiency.
Watch
CAC Ratio 0.5–1.0: spend is working but payback stretches past a year; pressure-test sales productivity, pricing, and gross margin before pouring more into growth.
Bad
CAC Ratio < 0.5: S&M is buying back less than fifty cents of margin per dollar spent; the growth engine is inefficient and the unit economics will not scale without intervention.
Watch-outs
- Skipping the gross-margin adjustment. The Bessemer CAC Ratio multiplies net new ARR by gross margin so it measures the contribution that survives delivery cost. Plugging in raw ARR inflates the ratio and flatters a high-COGS business that is less efficient than it looks.
- Using same-period S&M spend. The whole point of this metric is the lag — the spend that wins a customer comes before the revenue. Dividing by current-period spend turns it into a magic number, not the Bessemer CAC Ratio, and understates payback when spend is growing.
- Mismatching period boundaries. If net new ARR is quarterly but you divide by trailing-twelve-month S&M, the ratio is meaningless. Keep both windows the same length and offset by exactly one period.
- Using gross New ARR instead of net new ARR. Dropping downsell and churn from the numerator hides the leak in the bucket and overstates how much durable revenue the spend actually bought.
Worked example
Hypothetical
In Q2 a company books $1.2M of net new ARR — $1M new, $300K upsell, less $100K churn — at a 75% gross margin, so margin-adjusted net new ARR is $900K. It spent $1M on sales and marketing in Q1, the prior period that won those customers. The CAC Ratio is $900K ÷ $1M = 0.90, just under one-year payback and a candidate to optimize before scaling. Had Q1 S&M been $600K, the ratio would be 1.50 — strongly fundable.