The inputs are different
| ARR | Revenue run rate | |
|---|---|---|
| Source | Active recurring contracts | Actual revenue in a recent period |
| Services and one-time fees | Excluded | Included |
| Usage above commitment | Excluded | Included |
| Seasonality | Absent by construction | Projected forward as if permanent |
| Answers | What recurs today | What a period would total if repeated |
Seasonality is where run rate misleads
Annualizing a single period assumes every period looks the same. B2B SaaS periods do not. ORM's customer data shows Q2 and Q4 running stronger than Q1 and Q3, and the third month of a quarter running stronger than the first two.
Take a run rate off December and you annualize the strongest month of the strongest quarter. Take it off January and you annualize the weakest. That is why a run rate calculated at quarter close and the same run rate calculated three weeks later can differ materially at a business whose contracted ARR has not moved at all.
When each number belongs in the report
Use ARR for retention, valuation, and any question about the durability of the revenue base. Every retention metric needs a denominator of revenue that was supposed to recur, and that is precisely what ARR is.
Use run rate for early-stage businesses with too few contracts for ARR to mean much, for usage-heavy models where committed minimums cover a small share of actual revenue, and for a fast scale check on a product line.
Use neither as a forecast. Forecasts miss most often because the model was built on assumptions that stopped being true, whether that is a new competitor compressing average deal size or slower buying decisions stretching the time from qualified to closed. Forecast accuracy comes from a model that updates as those conditions move, which a run rate cannot do by construction. Build the sales forecast from pipeline, capacity, and retention curves, and keep run rate as a reference point.
Frequently Asked Questions
Is ARR the same as annualized run rate?
Only at a pure subscription business with no services revenue and no usage overages. Everywhere else run rate is larger, because it annualizes total revenue in a period while ARR counts only what recurs by contract.
When should you use run rate instead of ARR?
Use run rate when there are too few contracts for ARR to be meaningful, when a usage-based model collects most revenue above committed minimums, or when you want a quick scale check on a new product line. Use ARR for retention, valuation, and any question about durability.
Why does run rate move when ARR has not changed?
Run rate reflects the period it was taken from. A quarter with heavy implementation billing or a strong seasonal month annualizes higher than a quiet one, even though the contracted recurring base is identical.
Can you use run rate as a revenue forecast?
No. A run rate projects the past forward on the assumption that nothing changes. Deal sizes compress, win rates move, and cycles stretch, and a run rate has no mechanism to register any of it.
Put these metrics to work
ORM builds custom revenue forecast models that turn concepts like arr vs revenue run rate into prescriptive action for your team.
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