What is a good SaaS magic number?

A magic number of 0.75 or higher is generally considered efficient, and 1.0 or higher very efficient — a signal to scale sales and marketing spend. Between 0.5 and 0.75 is acceptable but worth fixing before adding spend, and below 0.5 signals an inefficient go-to-market motion. Directional 2026 medians by stage run from about 0.7 at seed to 0.8 at Series B.

How do I calculate the SaaS magic number?

Divide the change in ARR for the current quarter by your fully loaded sales and marketing spend from the prior quarter. For example, if ARR grew from $5.0M to $5.48M ($480K net new ARR) and prior-quarter S&M spend was $600K, the magic number is 0.8. Include salaries, commissions, ad spend, tools and agency fees in S&M — not just media spend.

What is the difference between the magic number and CAC payback period?

They measure the same underlying efficiency from opposite directions. The magic number is aggregate and top-down: new ARR per dollar of S&M spend. CAC payback is bottom-up: how many months of gross profit it takes to recover the cost of acquiring a customer. As a rough conversion, CAC payback in months is approximately 12 divided by (magic number × gross margin).

Why does the magic number use prior-quarter sales and marketing spend?

Because there is a lag between spending money and closing revenue — reps hired and campaigns launched in Q1 mostly produce ARR in Q2 or later. Using prior-quarter spend aligns the cost with the revenue it actually generated. Using same-quarter spend understates efficiency when spend is growing quickly.

Does the SaaS magic number include expansion revenue and churn?

Yes — the standard formula uses net new ARR, which is new business plus expansion minus churn and contraction. That means heavy churn can hide an efficient new-business motion. Many operators compute a second, new-business-only variant to separate acquisition efficiency from retention problems.

Is a magic number above 1.0 always good?

Mostly, but not automatically. Above 1.0 usually means you are underinvesting in growth and should scale S&M spend. However, a high magic number paired with slow growth can just mean you are starving the go-to-market engine, so read it alongside growth rate and the Rule of 40 rather than in isolation.

SaaS Metrics

SaaS Magic Number Calculator

Sales efficiency: new ARR generated per dollar of prior-quarter sales & marketing spend.

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What the SaaS magic number is — and why it decides your S&M budget

The SaaS magic number measures sales efficiency: how many dollars of new ARR you generate for every dollar of sales and marketing spend from the prior quarter. It answers the single most expensive question in a SaaS budget — should you pour more into S&M, hold, or pull back? A magic number of 1.0 means a dollar of S&M spend returns a dollar of annual recurring revenue within a quarter; since that revenue recurs, the spend pays for itself fast.

Boards and investors lean on it because it is hard to game. Pipeline and MQLs can be inflated; closed ARR against real spend cannot.

The formula, with a worked example

Magic Number = ΔARR ÷ prior-quarter S&M spend

The prior-quarter lag is the point: money spent on reps and campaigns in Q1 mostly converts to revenue in Q2. Using same-quarter spend flatters fast-growing spend and punishes disciplined teams.

Worked example: you ended Q1 with $5.0M ARR and Q2 with $5.48M, so ΔARR = $480K. Your fully loaded Q1 S&M spend — salaries, commissions, ad spend, tools, SDR agency fees — was $600K.

Magic Number = $480,000 ÷ $600,000 = 0.8

At 0.8 you're in efficient territory: growth spend is working, and you likely have room to increase it. Note ΔARR is net new — expansion helps you, churn drags you. If churn is masking strong new-business efficiency, split the calculation and check your quick ratio alongside it.

What's a good SaaS magic number?

Directional 2026 medians cluster between 0.7 (seed) and 0.8 (Series B), with 0.75 the common bar for bootstrapped and Series A companies. The bands:

Magic number	Read	What to do
≥ 1.0	Very efficient	You may be underinvesting — scale S&M aggressively
0.75 – 1.0	Efficient	Model is working; increase spend with confidence
0.5 – 0.75	Acceptable	Fix conversion, pricing or ICP before adding spend
< 0.5	Inefficient	Stop scaling spend; diagnose the go-to-market motion

These are directional medians, not laws — a PLG motion with near-zero S&M reads differently from enterprise field sales. Compare against your stage and motion on the full 2026 benchmarks page.

Common mistakes

Under-counting S&M. Fully loaded means salaries, benefits, commissions, tooling, events and agencies — not just ad spend. A magic number built on partial cost is fiction.
Ignoring gross margin. A 1.0 magic number at 60% gross margin recovers cash far slower than at 85%. Sanity-check the cash side with the CAC payback calculator — payback in months is roughly 12 ÷ (magic number × gross margin).
Reading one quarter. A single big deal slipping across a quarter boundary swings the number wildly. Track a trailing two- to four-quarter average and watch the trend.
Optimizing it in isolation. You can hit 1.2 by starving growth. Pair it with the Rule of 40 so efficiency doesn't come at the cost of growth rate.

The calculator runs entirely in your browser — no sign-up, nothing sent to a server — and scores your result against the 2026 bands instantly.

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Frequently asked questions

Related calculators

Quick Ratio

Growth efficiency: new + expansion MRR divided by churned + contraction MRR.

CAC Payback

How many months to recover CAC from gross-margin-adjusted new MRR.

Rule of 40

Growth rate + profit margin, including the weighted variant — do you clear 40%?

MRR / ARR

Turn plans, seats and billing terms into clean MRR and ARR — including net-new MRR after churn.