SaaS Magic Number Calculator 2026 Sales Efficiency Score

Calculate your SaaS magic number to measure sales efficiency. Understand exactly how much annualised revenue each dollar of S&M spend generates.

SaaS Magic Number
3.00
Excellent

Your sales efficiency is excellent. Each dollar of S&M spend generates more than a dollar of annualised revenue. You should consider investing more aggressively in sales and marketing.

Step-by-Step Calculation

1. QoQ Revenue Delta$800.0K - $650.0K = $150.0K
2. Annualise (x4)$150.0K x 4 = $600.0K
3. Divide by prev S&M spend$600.0K / $200.0K = 3.00

Note: Previous quarter S&M spend is used (not current) because there is a lag between spending and revenue impact.

Magic Number Thresholds

1.0+
Excellent. Invest more.
0.75
Healthy. On track.
0.5
Needs work. Optimise.
< 0.5
Poor. Diagnose.

When the Magic Number Breaks Down

Long Enterprise Sales Cycles

If your average sales cycle is 6-12 months, the one-quarter lag assumption fails. S&M spend in Q1 may not produce revenue until Q3 or Q4. Consider using a 2-quarter lag or tracking the metric on a rolling 6-month basis.

Usage-Based Revenue

When significant revenue growth comes from existing customers increasing usage (not new sales), the magic number overstates sales efficiency. The growth was driven by product usage, not S&M spend. Separate organic expansion from new logo contribution.

PLG with Viral Growth

Product-led growth companies often generate significant pipeline through word-of-mouth and viral mechanics that S&M spend did not directly create. The magic number gives S&M credit for growth it did not drive. Segment paid vs organic acquisition for accuracy.

Magic Number vs CAC Payback

AspectMagic NumberCAC Payback
Data requiredQuarterly revenue + S&M spendPer-customer CAC, ARPU, margin
GranularityCompany-level aggregatePer-customer, per-channel
Best forBoard reporting, trend trackingChannel optimisation, unit economics
Lag assumptionOne quarterNone (uses current data)
Healthy benchmark> 0.75< 18 months

Related Calculators

CAC CalculatorCAC PaybackARR CalculatorBurn Multiple

Frequently Asked Questions

What is the SaaS magic number?
The SaaS magic number measures sales efficiency by comparing annualised revenue growth to sales and marketing spend. The formula: (Current Quarter Revenue - Previous Quarter Revenue) x 4 / Previous Quarter S&M Spend. A magic number above 1.0 means every dollar spent on S&M generates more than a dollar of annualised revenue growth. Above 0.75 is healthy. Below 0.5 signals poor efficiency.
Why use previous quarter S&M spend, not current?
Sales and marketing spend typically has a lag effect on revenue. Money spent this quarter on ad campaigns, SDR outreach, and content creation generates pipeline and closed deals in the following quarter. Using previous quarter spend accounts for this lag. Using current quarter spend would compare apples to oranges: this quarter's revenue uplift was generated by last quarter's investment.
When does the magic number not work?
Three main scenarios: (1) Enterprise sales cycles over 6 months break the one-quarter lag assumption. The spend-to-revenue lag is longer than one quarter. (2) Usage-based revenue distorts the formula because revenue can grow without new customer acquisition, making sales look more efficient than it actually is. (3) PLG companies with viral growth generate revenue from organic channels that S&M spend did not drive, inflating the magic number.
What is the magic number vs CAC payback?
Both measure sales efficiency from different angles. The magic number uses aggregate quarterly data (total revenue growth / total S&M spend). CAC payback uses per-customer data (cost per customer / monthly contribution). The magic number is faster to calculate and does not require per-customer attribution. CAC payback is more granular and actionable for channel-level optimisation. Use the magic number for high-level efficiency tracking and CAC payback for operational decisions.