The committed floor is the ARR
A customer signs a $240,000 annual commitment and consumes $310,000. ARR is $240,000. The remaining $70,000 belongs in revenue and in cash planning. It is not contracted to recur, so it stays out of the number that drives retention math and valuation multiples.
Accounts with no commitment have no ARR. Put them on annualized run rate and label the line for what it is.
Two defensible policies
Committed-only ARR counts the floor and nothing else. It is conservative and easy to audit. It also understates a business where customers consistently run well above their commitments.
Annualized consumption ARR takes a trailing average of actual usage revenue and annualizes it. It tracks the economics more closely and moves around more. If you choose it, fix the lookback window and leave it fixed.
Whichever policy you pick, apply it to every account. A split policy where enterprise contracts get committed-only treatment and self-serve accounts get annualized consumption produces a total nobody can reconcile back to the billing system.
What breaks when overage hides inside ARR
Retention math goes first. A customer whose usage fell 20 percent while the contract stayed intact reads as contraction under one policy and as flat under the other. Both readings are internally consistent. Reporting one while the board assumes the other is not. Net revenue retention means something only when the denominator holds still across periods.
Forecasting goes second. Usage revenue responds to the customer's own transaction volume, which responds to their market. Forecasts miss most often because the model runs on assumptions that stopped being true, and a consumption base drifts faster than a seat base does. Keep committed and variable revenue on separate lines in the revenue forecast so you can see which half moved when the total misses.
Set the commitment high enough to matter
The usefulness of committed-only ARR depends on where the floor sits. Price the commitment near expected steady-state consumption and ARR describes most of the revenue. Set it as a token minimum to win the deal and ARR describes a fraction of it, which pushes every durability question onto a run rate that no forecast model should be built on.
Frequently Asked Questions
Does overage revenue count toward ARR?
Not under a committed-only policy, which is the more common treatment. Overage is real revenue and belongs in GAAP revenue and cash planning, but it is not contracted to recur, so counting it inflates the number used for retention and valuation.
What is the ARR of a pure pay-as-you-go customer?
Zero. There is no contracted recurring amount to annualize. Report those accounts on annualized run rate from a trailing period and label the line clearly so nobody mistakes it for contracted revenue.
Can you annualize actual consumption instead of the commitment?
Yes, if you fix the lookback window and apply it to every account. A trailing three or twelve month average tracks the economics more closely. Changing the window mid-year moves reported growth without anything changing in the business.
How do you set a minimum commitment that makes ARR meaningful?
Price the commitment near the customer's expected steady-state consumption rather than at a token floor. A floor set at 10 percent of real usage produces an ARR figure that describes almost none of the revenue.
Put these metrics to work
ORM builds custom revenue forecast models that turn concepts like how do you calculate arr for usage-based pricing? into prescriptive action for your team.
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