SaaS Metrics Investors Care About: ARR, Retention, Churn, and Runway

Investors reviewing a SaaS company usually start with four questions: how large is recurring revenue (ARR), how much of it stays (retention), how quickly customers and revenue leave (churn), and how long the cash lasts (runway). The first three come from billing data. Runway comes from your cash balance and spending, so it belongs in a finance model, not a churn tool.

The table defines each metric with its denominator, what an investor can infer from it, and whether ChurnWin calculates it. It is a definitions reference, not investment, accounting, or fundraising advice.

To apply the GRR and NRR formulas to your own numbers, the free calculator takes starting, ending, new, and expansion MRR. It does not connect to Stripe and does not estimate runway.

Calculate GRR and NRR from your MRR figures

Most disagreements about churn and retention numbers come from the denominator, not the numerator. Check these before sharing a figure:

• Adding new customers to the base. Logo churn and GRR describe the customers you had at the start of the period. Customers acquired during the period belong in growth, not in the retention denominator.
• Counting events instead of customers. A card that fails four times before recovering is not four churned customers, and a scheduled cancellation has not churned until the subscription ends. Count distinct customers whose subscription ended.
• Mixing new MRR into NRR. NRR measures the starting cohort only. Including revenue from new logos turns it into a growth rate.
• Letting GRR exceed 100%. If GRR is above 100%, expansion has leaked into it.
• Annualizing monthly churn by multiplying by 12. Compounding makes annual churn equal to 1 − (1 − monthly churn)¹², as the churn rate guide shows.
• Counting pending retries as lost. A failed invoice still inside its retry window has no outcome yet, so it belongs in neither side of the recovery rate.
• Comparing periods with different definitions. Monthly and annual cohorts, or revenue and logo churn, are not interchangeable. Name the period and the definition next to every number, and use retention cohorts to compare customers at the same age.

Annual Recurring Revenue (ARR) and Monthly Recurring Revenue (MRR) are the foundational metrics investors use to understand the scale and trajectory of a SaaS business. ARR is simply MRR multiplied by 12, and it represents the annualized run rate of your subscription revenue.

Investors look at ARR not just as a point-in-time number but as a trajectory. Key questions they ask:

• What is the current ARR and how fast is it growing?
• Is growth accelerating, stable, or decelerating?
• What percentage of ARR comes from new customers vs. expansion of existing customers?
• How concentrated is ARR across the customer base? (Losing one large customer should not be catastrophic.)

Important: ARR should only include recurring subscription revenue. One-time fees, professional services, and usage overages that are not contractually recurring should be excluded. Investors will scrutinize your ARR calculation, and inflating it with non-recurring revenue damages credibility.

At early stages (pre-Series A), investors focus on ARR growth rate more than absolute ARR. A company at $500K ARR growing 3x year-over-year is more attractive than one at $2M ARR growing 50%.

Year-over-year ARR growth rate is one of the first metrics investors evaluate. It signals market demand, product-market fit, and execution capability. Bessemer’s private-cloud dataset reports these averages by scale:

• $1M–$10M ARR: 200% average growth
• $10M–$25M ARR: 115% average growth
• $25M–$50M ARR: 95% average growth
• $50M+ ARR: 60% average growth in the published scale bands

These are historical averages from Bessemer’s cloud-company analysis, not universal fundraising requirements. Growth rate naturally decelerates as the base gets larger, so investors evaluate the trajectory, market, and efficiency together.

Investors also examine growth efficiency — how much does it cost to generate each dollar of new ARR? This is where metrics like CAC payback and burn multiple become important.

Net Revenue Retention (NRR) measures how much revenue you retain and expand from your existing customer base, excluding any new customer revenue. Many investors consider it the single most important SaaS metric because it indicates the underlying health and durability of the business.

Bessemer’s private-cloud benchmark describes roughly 85% gross retention and 120% net retention as strong retention that sustains momentum. Use that as one disclosed comparison point, then match your own ACV and cohort definition.

• NRR above 100%: Expansion more than offsets contraction and churn in the starting cohort.
• NRR at 100%: Expansion exactly offsets contraction and churn.
• NRR below 100%: The starting cohort shrinks before new-customer revenue is added.

For investors, high NRR means the business can grow even if new customer acquisition slows, which provides resilience during market downturns.

These three metrics together tell investors whether the unit economics of the business are sustainable:

Gross margin measures the percentage of revenue remaining after direct costs of delivering the service (hosting, support, third-party APIs). SaaS companies are valued partly on their high-margin profile.

• Bessemer’s private-cloud analysis says to aim for 65–70% gross margins over time
• A materially lower margin prompts questions about hosting, support, services, and pricing mix
• Gross margin should be stable or improving as the company scales

LTV:CAC ratio compares the lifetime value of a customer to the cost of acquiring them. It answers: “For every dollar spent on acquisition, how many dollars come back?”

• A ratio below 1:1 means modeled lifetime gross profit does not repay acquisition cost
• A higher ratio is not automatically better if it reflects underinvestment or an overstated lifetime assumption
• Investors will test the churn period, gross-margin input, and CAC allocation behind the headline ratio

CAC payback period measures how many months it takes for a customer’s gross profit to repay the acquisition cost. Shorter payback means faster capital recycling, but the useful comparison depends on ACV, sales motion, contract term, and growth stage.

The Rule of 40 is a widely used heuristic that balances growth and profitability. It states that a healthy SaaS company’s revenue growth rate plus profit margin should equal or exceed 40%.

For example:

• A company growing 60% with a −20% profit margin scores 40 (passing)
• A company growing 20% with a 25% profit margin scores 45 (passing)
• A company growing 30% with a −15% profit margin scores 15 (failing)

Bessemer describes 40%+ as the commonly referenced efficiency threshold and notes that its Nasdaq Emerging Cloud Index averaged closer to 50% in the cited analysis. The heuristic is most useful when the growth and margin definitions are stated consistently. It is particularly useful for evaluating companies at different stages:

• Early-stage: Growth typically dominates. A company growing 100% with a −50% margin still scores 50.
• Growth stage: A more balanced mix. Investors expect growth to moderate while profitability improves.
• Mature: Growth slows further, but strong profitability maintains or improves the score.

Do not use the score without naming the profitability measure. ARR growth plus free-cash-flow margin can produce a different result from revenue growth plus EBITDA margin.

The burn multiple is a relatively recent metric that has gained popularity among SaaS investors. It measures how efficiently a company converts cash burn into new ARR.

Where “net burn” is total cash spend minus total revenue (i.e., how much cash the company consumed in a period), and “net new ARR” is the change in ARR during that same period.

David Sacks introduced the metric as a rule of thumb for capital efficiency. His original examples describe 2x as reasonable for an early-stage company, 5x as terrible, and 3x or more as extraordinary investment that deserves scrutiny. Stage and period still matter:

• Compare like periods: Use net burn and net new ARR from the same month, quarter, or year.
• Expect improvement with maturity: A pre-revenue company cannot compute the ratio; later-stage sales efficiency should pull it down.
• Investigate movement: A worsening multiple can reflect rising cost, slowing net-new ARR, or both.

The burn multiple is useful because it directly links spending to output. Unlike the Rule of 40, which can mask inefficiency behind high growth rates, the burn multiple forces accountability for how capital is deployed. In a capital-constrained environment, investors increasingly favor efficient growth over growth at any cost.

Sources checked July 20, 2026. Investor benchmarks are comparison points from disclosed datasets or named frameworks, not guaranteed fundraising thresholds. Always state the period, cohort, accounting definition, and company scale.

• Bessemer Scaling to $100 Million benchmarks — ARR growth by scale, retention, gross-margin, and efficiency-score reference points.
• David Sacks original Burn Multiple framework — formula, examples, stage caveats, and capital-efficiency interpretation.