What the SaaS magic number measures
The magic number shows how much new annual recurring revenue your sales and marketing spend produced. A magic number of 0.84 means every $1 spent on sales and marketing last quarter added $0.84 of annualised revenue this quarter.
It is a quick efficiency check that needs only two figures from your income statement: revenue for two quarters in a row, and sales and marketing spend. That makes it easy to track every quarter and easy to compare across teams, plans or years.
How to calculate the magic number
Take the increase in quarterly revenue, multiply it by 4 to annualise it, then divide by sales and marketing spend from the quarter before.
Magic number = (this quarter's revenue − last quarter's revenue) × 4 ÷ last quarter's S&M spend
With the sample numbers:
- Q2 revenue: $2,100,000
- Q3 revenue: $2,310,000
- Revenue added: $210,000, or 10.0% quarter on quarter
- Annualised: $210,000 × 4 = $840,000 of net new ARR
- Q2 sales and marketing spend: $1,000,000
- Magic number: $840,000 ÷ $1,000,000 = 0.84
If you track ARR directly, skip the first steps: divide net new ARR for the quarter by the previous quarter's spend. Switch the calculator to ARR change to do this.
Why the spend comes from the quarter before
Deals rarely close in the same quarter the money is spent. Campaigns, hiring and pipeline built in one quarter usually turn into revenue in the next, so the standard formula lags spend by one quarter. If your sales cycle is much longer than a quarter, the magic number will swing more, and an average over several quarters tells you more than any single one.
How to read your result
These are common rules of thumb, not hard limits. Your stage, sales model and margins all matter.
- Above 1.0: each $1 of spend adds more than $1 of ARR. This is usually read as a signal to invest more in sales and marketing.
- 0.75 to 1.0: efficient. Keep spending at this pace and test increases in the channels driving growth.
- 0.5 to 0.75: okay. Growth is coming in, but find out which channels and segments drive it before adding budget.
- Below 0.5: inefficient. More spend is likely to buy expensive growth. Fix conversion, pricing or churn first.
In the example, 0.84 sits in the efficient band. To reach 1.0 on the same $1,000,000 of spend, the quarter would have needed $1,000,000 of net new ARR, which means $250,000 of added revenue instead of $210,000.
Gross margin and payback
Revenue is not profit. If it costs 20 cents to deliver each dollar of revenue, only 80 cents is left to pay back what you spent winning it. Multiplying the magic number by gross margin gives the margin-adjusted magic number: 0.84 × 80% = 0.67.
The same inputs give a rough payback period on sales and marketing: 12 ÷ (magic number × gross margin). In the example that is 12 ÷ 0.67, or about 17.9 months to earn back one quarter of spend from the new gross profit. It ignores churn during that time, so treat it as a best case.
Common mistakes
- Leaving out salaries and commissions. Sales and marketing spend is the whole cost of the team and programmes, not only ads. Leaving out people costs makes the number look far better than it is.
- Counting one-off revenue. Setup fees and services can make a quarter look bigger than its recurring growth.
- Reading one quarter on its own. Seasonality, a large deal or a slow month can move the result a lot. Compare the last three or four quarters.
- Ignoring churn. The formula uses the net change in revenue, so churn already pulls it down. A low magic number can be a retention problem, not an acquisition problem.
How to improve your magic number
- Cut spend that doesn't produce pipeline. Look at cost per opportunity by channel and move budget to what converts.
- Raise win rates and deal sizes. Better qualification and pricing add ARR without adding spend.
- Reduce churn and contraction. Every dollar you keep counts towards net new ARR.
- Build expansion into pricing. Upgrades from existing customers add revenue at a low cost of sale.
Related tools
Check growth and profitability together with the Rule of 40 Calculator, see MRR, churn, LTV, CAC and payback in one view with the SaaS Metrics Calculator, and measure how much revenue existing customers keep with the NRR Calculator. For help building pipeline that lifts your magic number, see our services.