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Growth accounting is a framework for decomposing a company's net growth in any metric — users, revenue, or engagement — into its contributing components: new additions, resurrections, expansions, contractions, and churns. It provides a structured way to understand not just how fast something is growing, but why it is growing (or declining) and which lever has the most impact. Applied to MRR (Monthly Recurring Revenue), growth accounting breaks net MRR change into: New MRR (from new customers), Expansion MRR (upsells, seat additions from existing customers), Reactivation MRR (returning churned customers), Contraction MRR (downgrades), and Churned MRR (lost customers). The net formula is: Net New MRR = New MRR + Expansion MRR + Reactivation MRR - Contraction MRR - Churned MRR. This framework, popularized by David Skok and widely used in SaaS, is also applied to user growth: Net New Users = New Users + Resurrected Users - Churned Users. Growth accounting reveals whether growth is driven primarily by acquisition (new MRR dominant), retention (expansion and low churn), or reactivation (indicating a healthy re-engagement motion). Companies with healthy growth accounting show strong expansion MRR that partially offsets churn — the mechanics of 'negative churn' where existing customers expand faster than others cancel. Companies in trouble show accelerating churn and contracting expansion that masks declining new business acquisition. The framework is essential for board reporting, investor updates, and internal strategy because it removes the ambiguity of net growth numbers. A company reporting 15% MRR growth might be growing through strong acquisition masking catastrophic churn — or through exceptional retention and expansion with slowing acquisition. Growth accounting shows the difference.
Net New MRR = New MRR + Expansion MRR + Reactivation MRR - Contraction MRR - Churned MRR Where each variable represents a specific measurable quantity in the finance and investment domain. Substitute known values and solve for the unknown. For multi-step calculations, evaluate inner expressions first, then combine results using the standard order of operations.
- 1Gather the required input values: MRR from customers, Additional MRR from, MRR from previously, MRR lost from.
- 2Apply the core formula: Net New MRR = New MRR + Expansion MRR + Reactivation MRR - Contraction MRR - Churned MRR.
- 3Compute intermediate values such as Quick Ratio if applicable.
- 4Verify that all units are consistent before combining terms.
- 5Calculate the final result and review it for reasonableness.
- 6Check whether any special cases or boundary conditions apply to your inputs.
- 7Interpret the result in context and compare with reference values if available.
Portfolio managers at asset management firms use Growth Accounting Calc to project expected returns across different asset allocations, stress-test portfolios against historical market scenarios, and communicate performance expectations to institutional clients and pension fund trustees.
Individual investors and retirement planners apply Growth Accounting Calc to determine whether their current savings rate and investment returns will produce sufficient wealth to fund 25 to 30 years of retirement spending, accounting for inflation and required minimum distributions.
Venture capital and private equity firms use Growth Accounting Calc to calculate internal rates of return on fund investments, model exit scenarios for portfolio companies, and benchmark performance against industry standards like the Cambridge Associates index.
Financial advisors use Growth Accounting Calc during client reviews to illustrate the compounding benefit of starting early, the impact of fee drag on long-term wealth accumulation, and the trade-off between risk and expected return in diversified portfolios.
Negative or zero return periods
In practice, this edge case requires careful consideration because standard assumptions may not hold. When encountering this scenario in growth accounting calculator calculations, practitioners should verify boundary conditions, check for division-by-zero risks, and consider whether the model's assumptions remain valid under these extreme conditions.
Extremely long time horizons
In practice, this edge case requires careful consideration because standard assumptions may not hold. When encountering this scenario in growth accounting calculator calculations, practitioners should verify boundary conditions, check for division-by-zero risks, and consider whether the model's assumptions remain valid under these extreme conditions.
Lump sum versus periodic contributions
In practice, this edge case requires careful consideration because standard assumptions may not hold. When encountering this scenario in growth accounting calculator calculations, practitioners should verify boundary conditions, check for division-by-zero risks, and consider whether the model's assumptions remain valid under these extreme conditions.
| Quick Ratio | Classification | Investor Sentiment | Primary Focus Area |
|---|---|---|---|
| Under 1.0 | Shrinking | Major red flag | Stop acquisition; fix retention urgently |
| 1.0 - 1.5 | Fragile growth | Concern | Retention + expansion investment needed |
| 1.5 - 2.5 | Moderate | Acceptable for early stage | Balance acquisition and retention |
| 2.5 - 4.0 | Healthy | Strong investor signal | Scale growth systematically |
| 4.0 - 6.0 | Exceptional | Top-quartile | Expand into new segments |
| 6.0+ | Rare/exceptional | Best-in-class | Maintain while managing hypergrowth complexity |
In the context of Growth Accounting Calc, this depends on the specific inputs, assumptions, and goals of the user. The underlying formula provides a deterministic relationship between inputs and output, but real-world application requires interpreting the result within the broader context of finance and investment practice. Professionals typically cross-reference calculator output with industry benchmarks, historical data, and regulatory requirements. For the most reliable results, ensure inputs are sourced from verified data, understand which assumptions the formula makes, and consider running multiple scenarios to bracket the range of likely outcomes.
In the context of Growth Accounting Calc, this depends on the specific inputs, assumptions, and goals of the user. The underlying formula provides a deterministic relationship between inputs and output, but real-world application requires interpreting the result within the broader context of finance and investment practice. Professionals typically cross-reference calculator output with industry benchmarks, historical data, and regulatory requirements. For the most reliable results, ensure inputs are sourced from verified data, understand which assumptions the formula makes, and consider running multiple scenarios to bracket the range of likely outcomes.
In the context of Growth Accounting Calc, this depends on the specific inputs, assumptions, and goals of the user. The underlying formula provides a deterministic relationship between inputs and output, but real-world application requires interpreting the result within the broader context of finance and investment practice. Professionals typically cross-reference calculator output with industry benchmarks, historical data, and regulatory requirements. For the most reliable results, ensure inputs are sourced from verified data, understand which assumptions the formula makes, and consider running multiple scenarios to bracket the range of likely outcomes.
In the context of Growth Accounting Calc, this depends on the specific inputs, assumptions, and goals of the user. The underlying formula provides a deterministic relationship between inputs and output, but real-world application requires interpreting the result within the broader context of finance and investment practice. Professionals typically cross-reference calculator output with industry benchmarks, historical data, and regulatory requirements. For the most reliable results, ensure inputs are sourced from verified data, understand which assumptions the formula makes, and consider running multiple scenarios to bracket the range of likely outcomes.
In the context of Growth Accounting Calc, this depends on the specific inputs, assumptions, and goals of the user. The underlying formula provides a deterministic relationship between inputs and output, but real-world application requires interpreting the result within the broader context of finance and investment practice. Professionals typically cross-reference calculator output with industry benchmarks, historical data, and regulatory requirements. For the most reliable results, ensure inputs are sourced from verified data, understand which assumptions the formula makes, and consider running multiple scenarios to bracket the range of likely outcomes.
In the context of Growth Accounting Calc, this depends on the specific inputs, assumptions, and goals of the user. The underlying formula provides a deterministic relationship between inputs and output, but real-world application requires interpreting the result within the broader context of finance and investment practice. Professionals typically cross-reference calculator output with industry benchmarks, historical data, and regulatory requirements. For the most reliable results, ensure inputs are sourced from verified data, understand which assumptions the formula makes, and consider running multiple scenarios to bracket the range of likely outcomes.
In the context of Growth Accounting Calc, this depends on the specific inputs, assumptions, and goals of the user. The underlying formula provides a deterministic relationship between inputs and output, but real-world application requires interpreting the result within the broader context of finance and investment practice. Professionals typically cross-reference calculator output with industry benchmarks, historical data, and regulatory requirements. For the most reliable results, ensure inputs are sourced from verified data, understand which assumptions the formula makes, and consider running multiple scenarios to bracket the range of likely outcomes.
プロのヒント
Build a growth accounting waterfall in your BI tool (Metabase, Looker, Tableau) that auto-updates monthly. Include a 12-month trend line for each component. This single dashboard gives more insight into business health than any other single metric view.
ご存知でしたか？
David Skok's blog post on SaaS metrics, which popularized growth accounting for the startup community, has been read over 10 million times and is considered required reading for SaaS founders seeking venture funding.
参考文献
- ›David Skok — SaaS Metrics 2.0 (ForEntrepreneurs.com)
- ›Christoph Janz — Point Nine Capital SaaS Metrics Framework
- ›OpenView Partners — SaaS Benchmarks Report
- ›Bessemer Venture Partners — State of the Cloud