The Rule of 40 Is Now the Rule of 60. Here's the Sales Math.
SaaS efficiency benchmarks shifted. PE investors now expect growth rate + profit margin to hit 60, not 40. Dave Kellogg breaks down why — and the sales velocity formula that tells you where to start.
Illustration generated with DALL-E 3 by Revenue Velocity Lab
For most of the last decade, SaaS companies were graded on the Rule of 40: your growth rate plus your profit margin should equal at least 40. Grow at 60%? You can lose 20%. Grow at 20%? Better be making 20%.
That benchmark is dead. Dave Kellogg — 40 years in enterprise software, former CEO of Host Analytics, board member at multiple SaaS companies — wrote in March 2026 that the Rule of 40 is becoming the Rule of 60. Not as an aspirational target. As the new floor.
The bar went up by 50%. The question is what to do about it.
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Why the benchmark shifted
The short version: private equity changed the math.
During the low-interest-rate era, growth justified everything. Burn cash, grow fast, raise another round at a higher multiple. The Rule of 40 was generous — a company growing at 40% with zero margin still passed.
That era ended. Kellogg traces the shift through PE deal economics. When a PE firm buys a SaaS company at 30x EBITDA and valuation multiples drop to 15x, a Rule-of-40 company returns 0.7x on the investment. That's a loss. A Rule-of-60 company, with the same multiple compression, returns 2.5x.
The difference isn't marginal. It's the difference between a fund that survives and one that doesn't.
| Era | Benchmark | Typical Profile | Investor Tolerance |
|---|---|---|---|
| GAAC (2015-2021) | Growth at any cost | 80% growth, -40% margin | Losses acceptable if growing fast |
| Rule of 40 (2022-2025) | Growth + margin ≥ 40 | 30% growth, 10% margin | Balanced, but growth still preferred |
| Rule of 60 (2026+) | Growth + margin ≥ 60 | 20% growth, 40% margin | Profit heavily weighted |
Source: Kellblog, "Why the Rule of 40 Is Becoming the Rule of 60", March 2026.
Notice the shift. In the Rule of 40 era, a company could grow 30% and make 10%. In the Rule of 60, the same company needs 40% margin — which means cutting costs by 30 percentage points or growing 30 points faster. Neither is easy.
The sales velocity formula
Kellogg's article lists 12 actions to respond. But for sales teams, one framework cuts through all of them: the sales velocity formula.
Sales Velocity = (Opportunities × Average Deal Value × Win Rate) ÷ Sales Cycle Length
This formula tells you how much revenue your pipeline generates per unit of time. Every improvement to one of these four variables accelerates the entire engine.
Here's what each variable means in practice for a small team:
Opportunities — the number of qualified deals entering your pipeline. Not leads. Not MQLs. Deals where a real person at a real company has a problem you can solve and is willing to have a conversation about it. More garbage in the top doesn't help. More qualified conversations does.
Average Deal Value — the revenue per closed deal. You can increase this by moving upmarket, bundling, or pricing on value rather than seats. For most SMB companies, this is the hardest variable to move quickly.
Win Rate — the percentage of opportunities that close. Improving win rate usually means better qualification (fewer bad deals entering the pipeline) or better sales execution (more competitive wins). Both take time but compound.
Sales Cycle Length — the number of days from first contact to closed deal. This is often the highest-leverage variable for small teams. If you can cut your cycle from 90 days to 60 days, you get 50% more pipeline throughput with zero additional leads.
For most SMB teams, cycle length is the most actionable variable. Every day spent on research, qualification, and internal routing before the first real conversation is a day added to the cycle. Compressing that pre-conversation work — through better targeting, signal-based outreach, and pre-qualified opportunity surfacing — can cut weeks off the cycle without requiring more leads or a higher win rate.
Where the formula meets the Rule of 60
The Rule of 60 demands efficiency. The sales velocity formula shows you where to find it.
Kellogg identifies several specific actions in his article. Here's how they map to the formula:
| Kellogg's Action | Velocity Variable | What It Means for a 5-Person Team |
|---|---|---|
| Improve sales mechanics | Cycle Length ↓ | Faster research → faster first contact → shorter cycle |
| Raise prices | Deal Value ↑ | Price on value delivered, not seats |
| Innovate the sales model | Opportunities ↑ | Signal-based prospecting finds more qualified targets |
| Build partner channels | Opportunities ↑ | Referrals enter warmer and close faster |
| Align the entire sales team | Win Rate ↑ | Every rep uses the same qualification criteria |
| Bring AI to operational level | All four | Research compression, auto-routing, prioritized pipeline |
The bottom row is the one worth pausing on. AI that compresses research time improves three variables simultaneously: more opportunities (reps find more qualified targets per day), shorter cycles (less time between identification and first contact), and arguably higher win rates (better targeting means fewer bad-fit deals in the pipeline).
A concrete example
Take a 5-person sales team with these numbers:
- 20 qualified opportunities per month
- $8,000 average deal value
- 25% win rate
- 90-day average sales cycle
Current sales velocity: (20 × $8,000 × 0.25) ÷ 3 months = $13,333/month
Now imagine compressing research time cuts the cycle to 60 days, and better targeting adds 5 more qualified opportunities per month while bumping win rate from 25% to 30% (because fewer unqualified deals enter the pipeline):
Improved velocity: (25 × $8,000 × 0.30) ÷ 2 months = $30,000/month
That's a 125% improvement in pipeline throughput. Same team. Same headcount. Same product. The difference is where each rep spends their time.
This kind of efficiency gain is exactly what the Rule of 60 demands. Not heroic growth. Not painful cost cuts. Better mechanics.
What Kellogg gets right — and what he doesn't say
Kellogg's article is excellent at diagnosing the problem and listing tactical responses. One point he makes clearly: this isn't a temporary market correction. The Rule of 60 reflects a structural shift in how software companies are valued and funded.
What the article doesn't address is how these changes land differently at different scales. Kellogg writes for $10M-$500M ARR companies with 20-350 GTM people. For a 5-person team at $1-5M, the priorities are different.
You don't have a partner channel to build. You probably can't raise prices 20% without losing customers. You don't have the luxury of a "sales model innovation" project that takes two quarters.
What you can do today:
Calculate your sales velocity with real numbers. Not estimates — pull the data from your CRM for the last 90 days. Then look at which variable is dragging the formula down the most. For most SMB teams, it's one of two things: too few qualified opportunities entering the pipeline, or too many days between identifying a prospect and having the first conversation.
Both of those problems trace back to the same root cause: research and qualification eating rep time that should be spent selling.
The math is simple. The discipline isn't.
The Rule of 60 is just arithmetic. Growth + margin ≥ 60. The sales velocity formula is just arithmetic too. Opportunities × deal value × win rate ÷ cycle length.
The hard part isn't understanding the formulas. It's measuring your own numbers honestly, finding the weakest variable, and investing in fixing it rather than compensating with raw effort. Hiring another rep is effort. Compressing the research that slows every rep down is leverage.
One thing to do this week
Calculate your sales velocity for the last quarter. Pull four numbers from your CRM:
- Total qualified opportunities created
- Average closed-won deal value
- Win rate (closed-won ÷ total resolved opportunities)
- Average days from opportunity creation to close
Plug them into the formula: (1 × 2 × 3) ÷ 4. That's your current velocity. Then ask: which variable would improve the most if my reps spent 2 fewer hours per day on research?
If the answer is "opportunities" or "cycle length," the highest-ROI investment isn't another hire. It's compressing the research.
If you want to see what that compression looks like, try Optifai free for 7 days. No credit card required.
Signal → suggested follow-up → ROI proof, all in one platform.
See weekly ROI reports proving AI-generated revenue.