Forecast
Run-Rate & Annualization Calculator
Scales a partial period to a full year, and projects year-end from year-to-date actuals, while showing what the projection implies for the periods that have not happened yet.
How this calculation works
- Simple annualization multiplies a period figure by the number of those periods in a year: a month by twelve, a quarter by four.
- Year-to-date projection scales actuals by the ratio of full-year periods to periods elapsed, which is the same arithmetic expressed against progress through the year.
- Day-weighted annualization scales by actual days elapsed rather than period count, which matters for partial months and for 4-4-5 style calendars where periods are unequal.
- The implied remainder shows what the projection requires from the periods still to come. It is the number worth arguing about, because it is the assumption the run rate is silently making.
Conventions and edge cases
- Annualizing a single period assumes the rest of the year looks exactly like it. For any seasonal business this is wrong, and it is wrong in a direction you can usually predict.
- A run rate built on a quarter containing a one-off — a large renewal, a catch-up billing, a shutdown — annualizes that one-off twelve times over. Normalize before annualizing.
- Early in the year, a small absolute variance annualizes into a large one. Two months of actuals project with six times the leverage of a full year.
Frequently asked questions
- When is a run rate misleading?
- Whenever the period is unrepresentative. Seasonality, one-off transactions, a shortened period, or a step change part-way through all get multiplied by the annualization factor. The arithmetic is trivially correct and the answer can still be badly wrong, which is why this tool surfaces the implied remainder.
- Should I annualize on days or on periods?
- Periods, when they are equal and complete. Days, when you are part-way through a period or working on a fiscal calendar where periods differ in length, such as 4-4-5. Day-weighting removes the distortion from comparing a 28-day month to a 31-day one.
- What is the implied remainder?
- The revenue or cost the projection requires from the periods that have not happened yet. Stating it turns an abstract annualized number into a testable claim, which is usually where the conversation with a budget holder should start.