Magic Number
Growth MetricsThe Magic Number is a sales-efficiency ratio popularized by Scale Venture Partners that captures how much annualized recurring revenue a SaaS team produces per dollar of sales and marketing spend. It compares net new ARR generated in a quarter to the sales and marketing spend that produced it.
It was designed to answer a simple question: is this team producing efficient growth? A Magic Number above 1.0 means the company is generating more annualized ARR than it spent on sales and marketing in the prior quarter. Below 1.0 means it is paying more to acquire than it gets back in the first year of contract.
Contents
Key takeaways
- Magic Number = (Net New ARR in Q × 4) ÷ Sales & Marketing Spend in prior Q. The ×4 annualizes; the prior-quarter spend reflects the lag between investment and return.
- Above 1.0 is efficient (the SaaS team produces more annualized ARR than it spent). 0.75 to 1.0 is acceptable. Below 0.5 means double the sales investment to produce the same ARR.
- Magic Number is a quarterly metric. Average it across 4 quarters to smooth out noise from large enterprise deals or one-quarter campaign spend.
What is the Magic Number?
The Magic Number is a quarterly efficiency metric. It takes the net new ARR added in a quarter (gross new ARR plus expansion ARR minus churn and contraction ARR), annualizes it by multiplying by 4, and divides by the sales and marketing spend in the prior quarter. The quarter-of-lag reflects the typical delay between sales investment and revenue capture in B2B SaaS.
It is one of several SaaS efficiency metrics, alongside CAC payback period, LTV-to-CAC ratio, and the Burn Multiple. Magic Number is most useful for boards and executives because it produces a single number that benchmarks well across companies.
How do you calculate the Magic Number?
The formula:
Magic Number = (Net New ARR in Q × 4) ÷ Sales & Marketing Spend in Q minus 1
Worked example: A SaaS company adds 1,500,000 EUR in net new ARR in Q3. In Q2, it spent 2,000,000 EUR on sales and marketing. Magic Number = (1,500,000 × 4) ÷ 2,000,000 = 6,000,000 ÷ 2,000,000 = 3.0.
A Magic Number of 3.0 is exceptional and unsustainable in most cases. More typical numbers:
- Magic Number of 0.5: the team produced 50% of its sales spend back as annualized ARR. Below efficient frontier; growth is unprofitable in the short term.
- Magic Number of 1.0: a dollar in equals a dollar of annualized ARR out. Considered the efficient threshold.
- Magic Number of 1.5: strong efficiency. Justifies aggressive sales investment.
- Magic Number above 2.0: the team should likely be investing more, since spend is producing outsized return.
Magic Number vs CAC payback vs Burn Multiple
Three SaaS efficiency metrics that overlap but answer different questions:
- Magic Number: annualized ARR produced per dollar of sales and marketing spend. Best for comparing sales efficiency across SaaS companies.
- CAC payback period: months of gross profit needed to recover CAC for one customer. Best for unit-economics decisions and pricing analysis.
- Burn Multiple: net cash burn divided by net new ARR. Best for capital efficiency at the company level (includes all spend, not just sales and marketing).
A company can have a strong Magic Number and a weak Burn Multiple if engineering and G&A spend is large relative to sales spend. The three together form the standard efficiency dashboard for a board review.
Activate your team on LinkedIn
Heyoo helps marketing teams turn employees into authentic, on-brand storytellers, with personalised drafts, a shared calendar, and pipeline-grade analytics.
Frequently asked questions
Why does Magic Number use prior-quarter spend?
Because B2B SaaS sales cycles take months. Spend in Q2 produces ARR in Q3 or later; aligning prior-quarter spend with current-quarter ARR captures that lag. Same-quarter calculations understate efficiency because they pair spend with ARR that has not yet booked.
Is a Magic Number above 2 too high?
Often it indicates underinvestment in growth. If the SaaS team is producing 2× its sales spend back as annualized ARR, more spend would likely produce more ARR until efficiency degrades. Sustained Magic Numbers above 2 are rare and usually trigger increased growth investment.
How does Magic Number relate to growth rate?
It does not directly. A company can post a Magic Number of 1.5 with 30% growth (spend was small) or with 100% growth (spend was large but efficient). Use Magic Number alongside absolute growth rate; the two together describe efficiency-adjusted growth.