Unit economics
Measure how efficiently sales & marketing spend turns into new ARR.
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- Claude, via MCP
How do you calculate the SaaS magic number?
Divide net new ARR added this quarter by last quarter's sales and marketing spend. $800,000 of new ARR on $1.1M of prior-quarter S&M gives 0.73. Above 0.75 is usually read as efficient enough to invest more, and the 2025 Benchmarkit median for B2B SaaS was 1.37. With quarterly revenue instead of ARR, multiply the revenue change by four first.
0.73× is workable but not efficient enough to floor it. Improve conversion and retention before scaling spend.
Rule of thumb: above ~0.75 you can invest confidently; below ~0.5 the model isn’t ready to scale. It measures efficiency, not absolute growth.
About this calculator
The magic number is the fastest gut-check a SaaS board has for one question: is sales and marketing spend actually working, or is growth being bought at an unsustainable price. It compares how much ARR grew this quarter against how much was spent on S&M last quarter, on the logic that spend takes time to convert into revenue.
How to use it
- Enter current quarter ARR and previous quarter ARR.
- Enter previous quarter sales & marketing spend, the spend that's presumed to have produced this quarter's growth.
- Read net new ARR (the quarter-over-quarter change) and the magic number, net new ARR divided by that prior spend.
- Compare the magic number against the 0.75 and 0.5 thresholds shown in the verdict to gauge whether current GTM efficiency supports investing further.
Methodology
Net new ARR is current quarter ARR minus previous quarter ARR, the absolute dollar growth over one quarter.
The magic number is net new ARR ÷ previous quarter S&M spend. Using prior-quarter spend rather than current-quarter spend is deliberate: it assumes a lag between spending and the ARR it produces, current quarter's growth is attributed to last quarter's investment, not this quarter's.
The commonly used bands are: above roughly 0.75 signals efficient growth worth funding further; 0.5-0.75 is workable but not yet efficient enough to scale aggressively; below 0.5 signals expensive growth that needs a go-to-market fix before adding more budget.
This is a single-quarter snapshot and can be noisy, one unusually large or small deal, a pricing change, or a seasonal quarter can swing the number without reflecting a real efficiency shift. Look at the trend across several quarters rather than acting on one reading alone.
The magic number formula
Net new ARR = Current quarter ARR − Previous quarter ARR Magic number = Net new ARR ÷ Prior quarter S&M spend Revenue version: Magic number = (Current quarter revenue − Prior quarter revenue) × 4 ÷ Prior quarter S&M spend
- Current quarter ARR
- ARR at the end of the quarter you are measuring.
- Previous quarter ARR
- ARR at the end of the quarter before. The difference already nets new, expansion, contraction and churn.
- Prior quarter S&M spend
- Total sales and marketing expense in the previous quarter: salaries, commissions, ads, events, agencies and tools.
- × 4
- Only needed in the revenue version, to turn one quarter of revenue change into an annual figure. ARR is already annual, so the tool does not multiply.
This calculator uses the ARR version. Aleph and Benchmarkit describe both forms and recommend lagging S&M by one period and sticking to one basis (ARR or revenue). A negative magic number means ARR fell during the quarter despite the spend.
Worked example: a $6M ARR company at quarter end
A B2B SaaS company closed the quarter at $6.0M ARR, up from $5.2M the quarter before. It spent $1.1M on sales and marketing in the prior quarter.
- Net new ARR = $6,000,000 − $5,200,000 = $800,000.
- Magic number = $800,000 ÷ $1,100,000 = 0.73.
- Verdict band: between 0.5 and 0.75, so the tool reads it as "Acceptable".
- To reach 0.75 on the same spend, net new ARR needs to be $825,000 (0.75 × $1.1M), only $25,000 more.
- To reach the 2025 median of 1.37, it would need about $1.5M of net new ARR on the same spend (1.37 × $1.1M).
- Same maths in rupees: ARR up from ₹10.5 crore to ₹12 crore (₹1.5 crore net new) on ₹1.8 crore of prior-quarter S&M gives 0.83.
At 0.73 the company is just under the usual 0.75 floor and well below the 2025 median. Each dollar of S&M returns 73 cents of annual recurring revenue, so at a high gross margin the spend still pays back in under two years, but adding budget before improving conversion or retention would lower the number further. The CAC payback period matrix translates the same efficiency into months.
Magic number benchmarks, B2B SaaS (full-year 2025)
| Measure | Magic number |
|---|---|
| Bottom quartile | 0.68 |
| Median | 1.37 |
| 75th percentile | 2.14 |
| Median, companies growing above 50% | 2.40 |
| Median, 2024 (for comparison) | 0.94 |
Private B2B SaaS spending on sales and marketing (2026 edition)
| Cost line | Median % of ARR |
|---|---|
| Selling costs | 15% (13% the previous year) |
| Marketing | 8% (unchanged) |
| Total spend, all departments, bootstrapped | 96% |
| Total spend, all departments, equity-backed | 101% |
What is a good SaaS magic number?
Use the 0.75 line as the floor, not the goal. The 2025 data shows how far above it typical companies sit:
- Below 0.68: bottom quartile. Fix conversion, pricing or retention before adding spend.
- 0.75 to 1.0: described by Aleph as the acceptable investment zone.
- Above 1.0: strong. The 2025 median was 1.37, the first time in years it cleared 1.0.
- Above 2.0: top quartile (75th percentile 2.14). Companies growing above 50% had a median of 2.40.
A high magic number with low spend can mean the company is under-investing. If the number holds above 1.0 for several quarters, adding budget is usually the right test. To see whether that spend also keeps the business above the growth-plus-margin bar, run the Rule of 40 sandbox.
Magic number in India vs the US
The ratio is currency-neutral, but an Indian SaaS company selling to US buyers may spend in rupees (salaries, SDR teams) and earn in dollars. Convert both sides at the same rate for the quarter, or currency moves will look like efficiency changes. Include GST only if you cannot recover it as input credit, and leave it out of ARR. Indian teams running outbound and LinkedIn for US pipeline can check channel efficiency with a B2B SaaS marketing agency in India review.
US SaaS boards often read the magic number quarterly next to CAC payback, and the benchmarks above are in USD, so a US company can compare directly. Where sales headcount is a large part of S&M, a hiring wave can push the number down for a few quarters before new reps ramp. The sales rep ramp calculator helps model that lag.
Common magic number mistakes
- Using quarterly revenue change without multiplying by four, which understates the result by 75%.
- Dividing by the current quarter's S&M instead of the prior quarter's.
- Counting only ad spend as S&M. Salaries, commissions, tools and agency fees belong in the denominator.
- Using bookings or total contract value instead of ARR, which inflates the numerator on multi-year deals.
- Reading one quarter as a trend. A single large deal or a seasonal quarter can move the number a lot.
- Ignoring churn: because net new ARR nets churn, a falling magic number can be a retention problem, not a sales one.
Sources
- SaaS Magic Number: 2026 benchmark and how to read it, Aleph (Benchmarkit 2026 SaaS & AI Performance Benchmarks). Accessed 2026-10-17.
- Rule of 40: what's a good score for SaaS in 2026?, Aleph (Benchmarkit 2026 SaaS & AI Performance Benchmarks). Accessed 2026-10-17.
- 2026 Spending Benchmarks for Private B2B SaaS Companies, SaaS Capital. Accessed 2026-10-17.
FAQ
Sales and marketing spend doesn't convert into revenue instantly, pipeline built this quarter typically closes next quarter. Using prior-quarter spend against current-quarter ARR growth better matches cause to effect than comparing spend and growth from the same period.
Above roughly 0.75 is the widely cited threshold for "efficient enough to invest more aggressively." Between 0.5 and 0.75 is workable but not yet a green light to scale spend. Below 0.5 usually means fixing conversion, retention, or targeting before adding more budget makes sense.
Treat one quarter as a data point, not a verdict. Large deals, seasonality, or a pricing change can swing it meaningfully. Track it over 3-4 consecutive quarters to see whether efficiency is trending up, flat, or declining before making a major spend decision off it.
Not directly, it only measures net change in ARR, new business plus expansion minus churn and contraction, all netted together. A magic number that looks fine can still hide serious churn if new bookings are masking it. Pair this with an NRR or MRR bridge view for the fuller picture.
A magic number of 1.0 means every dollar spent on sales and marketing last quarter added one dollar of annual recurring revenue this quarter. At an 80% gross margin, that spend is recovered in about 15 months (1 ÷ 0.8 years). Benchmarkit puts 1.0 as the line above which efficiency is strong.
They are close inverses. The CAC ratio divides S&M spend by new ARR, so a CAC ratio of 2.0 is like a magic number of 0.5. The magic number usually uses net new ARR, which subtracts churn, while CAC ratios often use gross new ARR.
In this calculator it does, because the change in ARR includes expansion, contraction and churn. That is fair if account managers and customer success expansion costs sit inside S&M. If they sit elsewhere, the magic number will look better than new-logo efficiency really is.
The Benchmarkit 2025 data shows the median rising from 0.94 in 2024 to 1.37. The same dataset shows median R&D and S&M spend falling as a share of revenue, so part of the rise comes from companies spending less per dollar of new ARR, not only from faster growth.
Yes. A very high number on small spend can mean demand is there but the company is not investing enough to capture it. If the magic number stays well above 1.0 quarter after quarter, adding S&M budget and watching whether efficiency holds is the usual next step.
Numbers looking off?
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