{"id":9204,"date":"2026-08-24T20:12:22","date_gmt":"2026-08-24T14:42:22","guid":{"rendered":"https:\/\/www.whizconsulting.net\/us\/?p=9204"},"modified":"2026-08-24T20:12:22","modified_gmt":"2026-08-24T14:42:22","slug":"rule-of-40-and-net-revenue-retention","status":"publish","type":"post","link":"https:\/\/www.whizconsulting.net\/us\/blog\/rule-of-40-and-net-revenue-retention\/","title":{"rendered":"Rule of 40 and Net Revenue Retention: The Two SaaS Metrics Investors Actually Check"},"content":{"rendered":"

For SaaS companies, investors want to know more than how fast revenue is growing. They also want to understand whether that growth is efficient, sustainable, and supported by strong customer retention.\u00a0<\/span>\u00a0<\/span><\/p>\n

Two metrics that help answer these questions are the Rule of 40 and Net Revenue Retention (NRR). The Rule of 40 measures the balance between growth and profitability, while NRR shows how much recurring revenue a company\u00a0retains\u00a0and expands from existing customers.\u00a0<\/span>\u00a0<\/span><\/p>\n

Together, these SaaS metrics give investors a clearer view of business quality, revenue durability, and long-term growth potential.<\/span>
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Keep Your SaaS Metrics Investor-Ready <\/h3>\r\n

Build reliable reporting around growth, retention, profitability, and recurring revenue. <\/p>\r\n\t\t<\/div>\r\n

\r\n\t\tKnow More<\/span> <\/path><\/svg><\/a>\r\n\t\t<\/div>\r\n \r\n <\/div>\r\n<\/div>\r\n

What Is the Rule of 40 in SaaS ?<\/h2>\n

The\u00a0Rule of 40\u00a0is a SaaS performance benchmark used to assess whether a company is balancing revenue growth with profitability. It\u00a0states\u00a0that a SaaS company\u2019s\u00a0growth rate plus its profit margin should equal or exceed 40%.<\/span>\u00a0<\/span><\/p>\n

The metric is useful because SaaS businesses often prioritize growth at\u00a0different stages. A fast-growing company may\u00a0operate\u00a0at a lower margin, while a more mature SaaS company may grow more slowly but generate stronger profits. The Rule of 40 gives investors\u00a0a simple way\u00a0to evaluate that trade-off.<\/span>\u00a0<\/span><\/p>\n

How to Calculate the Rule of 40<\/h3>\n

The basic Rule of 40 formula is:<\/span>\u00a0<\/span><\/p>\n

Rule of 40 = Revenue Growth Rate + Profit Margin<\/span><\/b>\u00a0<\/span><\/p>\n

For example, if a SaaS company has:<\/span>\u00a0<\/span><\/p>\n

    \n
  • Annual revenue growth of\u00a028%<\/span>\u00a0<\/span><\/li>\n
  • Profit margin of\u00a015%<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

    Its Rule of 40 score would be:<\/span>\u00a0<\/span><\/p>\n

    28% + 15% = 43%<\/span><\/b>\u00a0<\/span><\/p>\n

    Since the combined score is above 40%, the company meets the Rule of 40\u00a0benchmarks.<\/span>\u00a0<\/span><\/p>\n

    Companies may use EBITDA margin, operating margin, or free cash flow margin as the profitability\u00a0component. What matters most is using the same definition consistently when comparing performance across reporting periods.<\/span>\u00a0<\/span><\/p>\n

    What Counts as a Good Rule of 40 Score?<\/h3>\n

    A\u00a0Rule\u00a0of 40% or\u00a0higher\u00a0is\u00a0generally considered\u00a0strong because it\u00a0indicates\u00a0that the business is producing a healthy combination of growth and profitability.<\/span>\u00a0<\/span><\/p>\n

    A simple way\u00a0to interpret the score is:<\/span>\u00a0<\/span><\/p>\n

      \n
    • Above 40%:<\/span><\/b>\u00a0Strong balance of growth and profitability<\/span>\u00a0<\/span><\/li>\n
    • Around 40%:<\/span><\/b>\u00a0Generally,\u00a0meets the benchmark<\/span>\u00a0<\/span><\/li>\n
    • Below 40%:<\/span><\/b>\u00a0May\u00a0indicate\u00a0slower growth, weak margins, or both<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

      However, the score should not be viewed\u00a0in\u00a0isolation. Investors may also consider the company\u2019s stage, recurring revenue growth, cash generation, customer retention, and overall unit economics before judging performance.<\/span>\u00a0<\/span><\/p>\n

      Growth Rate vs. Profitability: How the Trade-Off Works<\/h3>\n

      The Rule of 40 does not require a SaaS company to have both high growth and high profitability. Instead, one can partially offset the other.<\/span>\u00a0<\/span><\/p>\n

      A rapidly expanding SaaS company, for instance, might grow revenue by\u00a055%\u00a0while\u00a0operating\u00a0at a\u00a0-10% margin. Its Rule of 40 score would still be\u00a045%.<\/span>\u00a0<\/span><\/p>\n

      By contrast, a mature SaaS company might grow by only\u00a015%\u00a0but generate a\u00a030% profit margin, also resulting in a score of\u00a045%.<\/span>\u00a0<\/span><\/p>\n

      This is why the metric is useful for investors. It provides a common framework for comparing SaaS businesses with different growth strategies and levels of maturity.<\/span>\u00a0<\/span><\/p>\n

      Simple Rule of 40 Example<\/h3>\n

      Consider two SaaS companies:<\/p>\n\n\n\n\n\n\n\n
      Metric<\/th>\nSaaS Company A<\/th>\nSaas Company B<\/th>\n<\/tr>\n<\/thead>\n
      Revenue Growth<\/td>\n45%<\/td>\n18%<\/td>\n<\/tr>\n
      Profit Margin<\/td>\n-8%<\/td>\n26%<\/td>\n<\/tr>\n
      Rule of 40 score<\/td>\n37%<\/td>\n44%<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

      Company A is growing much faster, but its negative margin brings its Rule of 40 score below the benchmark.<\/span>\u00a0<\/span><\/p>\n

      Company B is growing more slowly, but its stronger profitability produces a Rule of 40 score of 44%.<\/span>\u00a0<\/span><\/p>\n

      For investors, this comparison shows why revenue growth alone is not enough. The Rule of 40 helps reveal<\/span>\u00a0how efficiently\u00a0that growth\u00a0is being produced and whether the company\u2019s financial model can support it over time.<\/span>\u00a0<\/span><\/p>\n

      What Is Net Revenue Retention?<\/h2>\n

      Net Revenue Retention (NRR)\u00a0is a SaaS metric that measures how much recurring revenue a company keeps from its existing customers over a specific period after accounting for upgrades, expansions, downgrades, and cancellations.<\/span>\u00a0<\/span><\/p>\n

      Unlike new customer revenue, NRR focuses only on customers the business already had at the beginning of the period.\u00a0This makes it useful for understanding whether the existing customer base is becoming more or less valuable over time.<\/span>\u00a0<\/span><\/p>\n

      An NRR above 100% means expansion revenue from existing customers is more than offsetting revenue lost through churn and downgrades.<\/span>\u00a0<\/span><\/p>\n

      How to Calculate Net Revenue Retention<\/h3>\n

      The standard NRR formula is:<\/span><\/span>\u00a0<\/span><\/p>\n

      NRR =<\/span><\/b>\u00a0(Starting Recurring Revenue + Expansion Revenue \u2212 Contraction Revenue \u2212 Churned Revenue) \u00f7 Starting Recurring Revenue \u00d7 100<\/span>\u00a0<\/span><\/p>\n

      For example, suppose a SaaS company begins the year with\u00a0$1 million in Annual Recurring Revenue (ARR)\u00a0from existing customers. During the year, it generates:<\/span>\u00a0<\/span><\/p>\n

        \n
      • $150,000<\/span><\/b>\u00a0in expansion revenue<\/span>\u00a0<\/span><\/li>\n
      • $40,000<\/span><\/b>\u00a0in downgrades<\/span>\u00a0<\/span><\/li>\n
      • $60,000<\/span><\/b>\u00a0in churned revenue<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

        Its NRR would be:<\/span>\u00a0<\/span><\/p>\n

        ($1,000,000 + $150,000 \u2212 $40,000 \u2212 $60,000) \u00f7 $1,000,000 \u00d7 100 = 105%<\/span><\/span>\u00a0<\/span><\/strong><\/p>\n

        The company therefore\u00a0<\/span>retained<\/span>\u00a0and expanded its original customer revenue base by 5%.<\/span><\/span>\u00a0<\/span><\/p>\n

        What Revenue Is Included in NRR?<\/h3>\n

        NRR typically includes recurring revenue movements from customers who were already active at the start of the measurement period.<\/span>\u00a0<\/span><\/p>\n

        These include:<\/span>\u00a0<\/span><\/p>\n

          \n
        • Starting recurring revenue:<\/span><\/b>\u00a0ARR or MRR from the existing customer base<\/span>\u00a0<\/span><\/li>\n
        • Expansion revenue:<\/span><\/b>\u00a0Additional recurring revenue from upgrades,\u00a0additional\u00a0users, higher usage, or cross-selling<\/span>\u00a0<\/span><\/li>\n
        • Contraction revenue:<\/span><\/b>\u00a0Revenue lost when customers downgrade plans or reduce usage<\/span>\u00a0<\/span><\/li>\n
        • Churned revenue:<\/span><\/b>\u00a0Recurring revenue lost when customers cancel completely<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

          Revenue from newly\u00a0acquired\u00a0customers is not included in NRR.\u00a0This separation allows investors to see how effectively the SaaS company is growing revenue from its existing customer base without relying on\u00a0new sales.<\/span><\/p>\n

          What Is a Good NRR for a SaaS Company?\u00a0<\/span><\/h3>\n

          An\u00a0NRR above 100% is\u00a0generally a\u00a0positive sign\u00a0because it mea<\/span>ns revenue expansion from existing customers is exceeding revenue lost through churn and contraction.<\/span>\u00a0<\/span><\/p>\n

          As a simple interpretation:<\/span>\u00a0<\/span><\/p>\n

            \n
          • Above 120%:<\/span><\/b>\u00a0Indicates\u00a0strong customer expansion and retention<\/span>\u00a0<\/span><\/li>\n
          • 100%\u2013120%:<\/span><\/b>\u00a0Generally,\u00a0reflects\u00a0healthy existing-customer revenue performance<\/span>\u00a0<\/span><\/li>\n
          • Below 100%:<\/span><\/b>\u00a0Existing customer revenue is shrinking overall<\/span>\u00a0<\/span><\/li>\n<\/ul>\n

            However, an appropriate NRR benchmark can vary based on the SaaS business model, customer segment, pricing structure, and company maturity. Enterprise SaaS businesses, for example, may have different retention patterns than companies serving smaller customers.<\/span>\u00a0<\/span><\/p>\n

            For investors, the direction and consistency of NRR can be just as important as the headline percentage.<\/span>\u00a0<\/span><\/p>\n

            Simple NRR Example<\/h3>\n

            Consider a SaaS business that starts the quarter with\u00a0$500,000 in recurring revenue\u00a0from existing customers.<\/span>\u00a0<\/span><\/p>\n

            During the quarter:<\/span>\u00a0<\/span><\/p>\n\n\n\n\n\n\n\n\n\n
            Revenue Movement<\/th>\nAmount<\/th>\n<\/tr>\n<\/thead>\n
            Starting Recurring Revenue<\/td>\n$500,000<\/td>\n<\/tr>\n
            Expansion Revenue<\/td>\n+$75,000<\/td>\n<\/tr>\n
            Contraction Revenue<\/td>\n-$20,000<\/td>\n<\/tr>\n
            Churned Revenue<\/td>\n-$30,000<\/td>\n<\/tr>\n
            Ending Revenue from Existing Customers<\/td>\n$525,000<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

            The NRR calculation would be:<\/span>\u00a0<\/span><\/p>\n

            ($500,000 + $75,000 \u2212 $20,000 \u2212 $30,000) \u00f7 $500,000 \u00d7 100 = 105%<\/span><\/b>\u00a0<\/span><\/p>\n

            An NRR of\u00a0105%\u00a0means t<\/span>he company increased recurring revenue from its original customer base by 5%, even after accounting for customers who downgraded or left.<\/span>\u00a0<\/span><\/p>\n

            This is why NRR matters to SaaS investors. It shows whether growth is supported by customers continuing to stay, spend, and expand rather than depending entirely on\u00a0acquiring\u00a0new customers.<\/span>\u00a0<\/span><\/p>\n

            How Investors Interpret Different Rule of 40 and NRR Combinations<\/h2>\n

            The Rule of 40 and NRR\u00a0becomes\u00a0more useful when investors evaluate them together. One measures the balance between growth and profitability, while the other shows whether existing customers are\u00a0maintaining\u00a0or increasing their recurring revenue.<\/span>\u00a0<\/span><\/p>\n

            Different combinations can therefore point to\u00a0very different\u00a0strengths and risks within a SaaS business.<\/span>\u00a0<\/span><\/p>\n

            High Rule of 40 + High NRR<\/h3>\n

            A\u00a0high Rule of 40 score combined with strong NRR is\u00a0generally the\u00a0most attractive position.<\/span>\u00a0<\/span><\/p>\n

            It suggests that the SaaS company is balancing growth and profitability effectively while also\u00a0retaining\u00a0customers and generating\u00a0additional\u00a0revenue from its existing base.<\/span>\u00a0<\/span><\/p>\n

            For investors, this combination can\u00a0indicate:<\/span>\u00a0<\/span><\/p>\n