Magic Number — Sales & Marketing efficiency in a single figure

Magic Number — Sales & Marketing efficiency in a single figure

Magic Number is a simple way to answer the core SaaS question: "should I hire another sales rep, or is it pointless?"

The formula from Scale Venture Partners:

> Magic Number = (Net New ARR in a quarter × 4) / S&M spend in the quarter

The numerator is the annualized velocity of new ARR (quarter × 4). The denominator is what you put into Sales & Marketing.

If the result is >1 — every $1 of S&M generates >$1 of ARR over a year. You can scale up. If <1 — optimize the funnel before hiring.

Benchmarks

Worked example

SaaS Series A:

• Net New ARR in Q1: $300k
• S&M spend in Q1: $200k

Magic Number = (300 × 4) / 200 = 1200 / 200 = 6.0 → exceptional.

The catch: at numbers like this you're usually under-investing in marketing. If you can scale to $400k S&M and get $500k Net New ARR — that's better.

How it differs from other metrics

• Deciding: "hire more sales reps?" Yes if >1.
• Optimizing the funnel: higher funnel CR = higher Magic Number
• Comparing S&M channels against each other (Magic Number per channel)

Use Burn Multiple when:

• Preparing for an investor pitch — it's the macro metric
• Analyzing the whole company, not just GTM

How to improve Magic Number

Numerator (Net New ARR) — growth

1. Pricing review — every 12 months. The old price is often below current value
2. ICP focus — close your top-3 segments, don't spread across 10
3. Lead-to-trial conversion — landing page A/B tests
4. Trial-to-paid conversion — onboarding flow, email cadence
5. Expansion revenue — counts as Net New ARR

Denominator (S&M) — reduction

1. Channel mix — organic is cheaper than paid. SEO/content/referrals = lower cost per lead
2. Tool consolidation — sometimes 30% of S&M spend
3. Hire timing — don't hire an SDR before you've proven the ICP
4. Outbound vs inbound — outbound costs 3-5× more at scale

Real-world improvement example

B2B SaaS, Series A:

Q1 baseline:

• Net New ARR: $200k
• S&M: $250k
• Magic Number = 800 / 250 = 3.2

Q2 actions:

• Raised prices +15% → new ARR +12%
• Cut paid spend by $50k (replaced with content)
• Net New ARR: $224k
• S&M: $200k
• Magic Number = 896 / 200 = 4.5 → +40% improvement

When Magic Number is MISLEADING

1. Brand-building investments — top-of-funnel marketing works over 6-12 months, not a quarter
2. Enterprise sales cycles >6 months — Q4 ARR is Q1 marketing spend, the formula is out of sync
3. PLG models — self-serve users show up with a lag after content marketing
4. Free-tier→paid conversions — the long tail can distort the numerator

For PLG / long sales-cycle businesses, a rolling 12-month Magic Number is better.

The link to venture funding

In VC presentations, often:

• Series Seed — Magic Number is usually unstable, not critical
• Series A — must be >1, or you won't close the round
• Series B — must be >1.5, or valuation drops
• Series C+ — consistently >1, plus Burn Multiple <1.5

Bottom line

Magic Number is the first metric an investor calculates on the back of an envelope before investing. Know yours. If <1 — optimize the funnel first, then ask for the round. If >1.5 — hire and scale.

Calculate your Magic Number below — the built-in calculator shows the result + recommendations.

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Further resources

• /en/burnMultiple — Burn Multiple, the macro version
• /en/cacPayback — CAC Payback Period
• /en/blog/burn-multiple-saas-2026 — Burn Multiple deep dive
• Scale Venture Partners — original Magic Number article