--- title: "7 Key Steps to Accurately Calculate ARR for Usage-Based Pricing Models" description: "A 7-step method for finance teams to annualize usage revenue accurately, segmenting unpredictable spikes from stable patterns." url: "https://ordwaylabs.com/blog/calculate-arr-usage-based-pricing/" type: "Post" publisher: "Ordway" language: "en-US" published: "2025-11-13T10:33:41+00:00" updated: "2026-09-23T06:58:15+00:00" author: "Steve Keifer" categories: - "ARR" - "Blog" --- # 7 Key Steps to Accurately Calculate ARR for Usage-Based Pricing Models ## Usage-Based ARR: What Finance Teams Need to Know ARR gets messy in [usage-based models](/resources/usage/usage-based-pricing-strategies-for-success/) if you treat every spike like a signal. The only way to keep it clean is to annualize stable usage patterns, segment out the unpredictable stuff, and lock your rules into a policy everyone follows. When usage revenue behaves consistently at the portfolio level, it’s defensible to include it in ARR, but only if your calculation method is transparent, audited, and approved at the board level. ## 1.Grasp the Principle of Predictability The crucial factor for including usage fees in ARR isn’t whether they are fixed, but whether they are predictable. While an individual customer’s usage may fluctuate, the combined revenue from your entire customer base often creates a stable and forecastable trend. If this aggregate pattern is consistent, it can be treated as recurring revenue for reporting purposes. ## 2. Select an Annualization Formula A widely accepted method for calculating the usage-based portion of ARR is to annualize recent financial performance. The most common approach is to take the GAAP-recognized usage revenue from the most recent quarter and multiply it by four. Alternative methods, such as multiplying the last month’s revenue by twelve or using the full trailing twelve-month figure, can also be valid depending on your business’s stability. ## 3.Segment Your Customer Base by Behavior It’s unlikely that all your customers exhibit the same usage patterns. You might find that enterprise clients with annual contracts and monthly minimums are highly predictable, whereas smaller customers on pay-as-you-go plans are more volatile. A sound strategy is to include revenue from the consistent segments in your ARR while excluding the more erratic ones. ## 4. Adjust for Seasonal Business Cycles If your business experiences predictable seasonality, such as an e-commerce platform that peaks during the holidays, using a short-term calculation can distort your ARR. In such scenarios, it is more accurate to use a longer-term average, like the total revenue from the trailing twelve months, to smooth out these fluctuations and reflect a true recurring run-rate. ## 5. Create a Formal, Written Policy Your approach to calculating ARR should not be based on unwritten rules. Your finance team must create a formal policy document that explicitly defines which revenue streams are included (e.g., usage fees, monthly plans) and which are excluded (e.g., professional services, pilot programs). This document serves as the definitive guide for all reporting. ## 6. Obtain Official Board and Stakeholder Approval An ARR calculation policy is a critical component of your company’s financial governance. Once drafted, it should be reviewed by senior management and key investors to build consensus. The final step is to secure official sign-off from your board of directors, which solidifies the policy and empowers its consistent enforcement. ## 7. Communicate Your Methodology Transparently Building and maintaining investor trust requires absolute clarity. Whenever you present ARR figures, you must also disclose how they are calculated, particularly regarding usage-based components. This is best done in a footnote or an appendix slide, as it prevents ambiguity and demonstrates financial rigor. ## Pro-Tips ### Rely on History, Not Forecasts Base your usage-based ARR calculations on normalized historical data, not optimistic sales forecasts. Historical performance provides a defensible measure of actual recurring revenue, while projections can lead to inflated figures that damage credibility if targets are not met. ### Embed Your Policy in Your Systems A documented policy is only effective if it’s followed. Audit your financial reporting systems, from spreadsheets to dedicated software, to ensure the calculations perfectly align with your approved methodology. This prevents reporting errors and ensures every metric is consistent. ### Educate All Revenue-Focused Teams Ensure that your ARR policy is understood beyond the executive suite. Conduct training sessions for key employees in accounting, revenue operations, and financial planning. A shared understanding across teams is essential for maintaining [accuracy and consistency in all reporting](/resources/video/saas-metrics-reporting-challenges/). ## Next Steps for Calculating Usage-Based ARR [Accurately capturing ARR](/resources/white-papers/three-ways-to-calculate-arr-for-saas/) in usage-based environments isn’t about clever math. It’s about discipline: proving predictability with historical data, annualizing revenue the same way every time, and documenting a policy you can survive an audit with. When your assumptions are consistent and your disclosures are clear, ARR becomes a reliable signal instead of a guessing game. [![Screenshot of Ordway's ARR MRR reporting software](/wp-content/uploads/2024/04/arr-mrr-reporting-product-cta.jpg)](/products/investor-metrics/arr-reporting-software/) ## ARR Reporting Software **from Ordway** Track new, expansion, contraction, renewal, and churn ARR. Segment ARR by product line, geographic region, and legal entity. Report on ARR growth rates. [Track ARR, NRR & Churn](/products/investor-metrics/arr-reporting-software/) ## Frequently Asked Questions ### How do you calculate ARR for usage-based pricing? Take your GAAP-recognized usage revenue from the most recent quarter and multiply it by four. This annualization method works when your aggregate usage patterns are predictable across your customer base, even if individual customers fluctuate. ### Can you include usage revenue in ARR? Yes, but only if the usage is predictable at the portfolio level and your calculation method is transparent, audited, and approved by the board. Individual customer spikes shouldn't drive ARR changes. ### What makes usage revenue predictable for ARR? Predictability comes from stable aggregate patterns across your entire customer base, not from individual customer consistency. When combined usage revenue creates a forecastable trend, it qualifies as recurring revenue. ### What's the key principle for including usage fees in ARR? Predictability matters more than whether fees are fixed. Your focus should be on whether aggregate usage revenue behaves consistently at the portfolio level, not on individual customer behavior. ## About Ordway Ordway is an all-in-one billing and revenue automation platform for growing B2B SaaS companies, typically from post-Series A to pre-IPO. It combines [Subscription Invoicing](/products/subscription-invoicing-software/), [Recurring Billing](/products/recurring-billing-software/), [Metered Billing](/products/metered-billing-software/), [SaaS Billing](/lp/ordway-saas-billing/), [SaaS Accounting](/products/saas-accounting-software/) and [AI-Powered Revenue Management](/products/ai-powered-revenue-management/) to automate complex pricing models, streamline revenue recognition and accelerate the financial close.