FORECAST.ETS
Supported, behaves as documentedCategory: Statistical · Last tested 2026-08-06
Real, executed compatibility results for the FORECAST.ETS function across Microsoft Excel, Google Sheets, and LibreOffice Calc — verified by actually running it. Syntax and links to each vendor’s official documentation are below.
Support matrix
| Engine | Documented | Live-tested | Verdict |
|---|---|---|---|
| Excel | Yes | Not yet | n/a |
| Google Sheets | No | Not yet | n/a |
| LibreOffice Calc | No | Yes (25.8.7.3, 2026-08-06) | Supported, behaves as documented |
LibreOffice version history
We executed the same test cases under each LibreOffice release to show exactly when FORECAST.ETS’s support changed — not documentation claims, real results.
| LibreOffice version | Verdict | Tested |
|---|---|---|
| 25.2.0.3 | Supported, behaves as documented | 2026-07-24 |
| 25.8.7.3 | Supported, behaves as documented | 2026-08-06 |
Executed test cases
LibreOffice Calc 25.8.7.3 (tested 2026-08-06)
| Formula | Description | Result | Expected | Verdict |
|---|---|---|---|---|
| =FORECAST.ETS(A7,B1:B6,A1:A6) | Existence probe: exponential-smoothing forecast of the next point of a rising series. The AAA algorithm's exact output depends on implementation internals, so we only assert the engine recognizes the function and returns a numeric value (not #NAME?) | 70 | Non-deterministic across implementations by design (smoothing-parameter optimization differs); the key datum is whether the engine has FORECAST.ETS at all. Excel returns ~70 for this series. |
Ran OK |
Docs & syntax
- Excel: official documentation