Practical guide
ARR vs annual revenue when a SaaS business is growing
See why a year-end ARR snapshot can differ from annual revenue, using a transparent quarterly growth example.
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Why can ARR exceed the year’s revenue?
A year-end ARR snapshot annualizes the latest recurring monthly base. If the company grew during the year, that latest base may be larger than the amounts earned in earlier months. Multiplying the final month by twelve therefore answers a different question from adding twelve actual months.
An illustrative growth schedule
Assume recurring monthly amounts stay flat within each quarter, with no other revenue. For this example only, treat the monthly amounts as revenue in the corresponding month.
| Quarter | Monthly recurring amount | Three-month total |
|---|---|---|
| Q1 | $10,000 | $30,000 |
| Q2 | $15,000 | $45,000 |
| Q3 | $20,000 | $60,000 |
| Q4 | $25,000 | $75,000 |
The year’s total is $210,000. December’s MRR annualizes to $300,000 ARR. The $90,000 gap is not missing cash or an accounting error in this example; it reflects the growth path.
Enter $25,000 into the ARR calculator to reproduce the ending run rate. Add the four quarterly totals separately to reproduce the period total. The tool intentionally has only one MRR input, so it cannot recover the growth schedule from the final snapshot.
Build a useful comparison
Label a report with both “ARR at December end” and “revenue over the year.” Keep the date and definition beside each value. If the company instead shrinks, the ending run rate may be below the historical period total.
Questions about forecasting
Can I use $300,000 as next year’s forecast?
Only as a flat-base scenario with explicitly unchanged subscriptions. New sales, cancellations, price changes, and contract timing require a separate forecast. The calculator does not estimate their probability.
Does annualized run rate always mean recurring revenue?
No. A general revenue run rate may annualize non-recurring sales too. This calculator is specifically intended for the recurring monthly input stated on the page. Mixing definitions makes comparisons between businesses unreliable.
Use the arr calculator to reproduce the scenario with your own inputs.