Funktionsweise im Detail.
ISNUMBER ist eine zentrale Formel in Excel. Checks whether a value is numeric and returns TRUE or FALSE. Sie optimiert Ihre Tabellenkalkulationen, automatisiert Routineabfragen und sorgt für fehlerfreie Auswertungen in modernen Tabellen.
Syntax.
Standardmäßige Excel-Schreibweise=ISNUMBER(value)Argumente.
Alle von dieser Funktion akzeptierten Parameter im Überblick.
The cell or expression to test.
Beispiel:A2Praxisbeispiel.
Schritt-für-Schritt-SzenarioData Validation - Numeric Price Check
Check if entered price values are numbers or accidental text strings.
| Product | Price Input | Is Number? |
|---|---|---|
| Monitor | 249.99 | — |
| Keyboard | Free | — |
| Mouse | 29.95 | — |
=ISNUMBER(B2)Evaluates ISNUMBER over the sample table cells, placing the verified output in cell C2.
Formel-Generator.
Vollständigen Assistenten öffnenPassen Sie die Eingabefelder an, um eine fertige Formel für Ihre Tabelle zu kopieren.
=ISNUMBER()Ergebniseigenschaften.
Returns boolean TRUE based on sample evaluation criteria and active cell references.
Empfohlene Vorgehensweise
- Nest inside FIND or SEARCH to test if text contains a specific substring: =ISNUMBER(SEARCH("corp", A2)).
- Dates and times always evaluate to TRUE in ISNUMBER.
Typische Fehlerquellen
- Numbers imported from databases formatted as text strings (e.g. "1200") return FALSE. Use VALUE(A2) to convert them first.
Kompatibilität nach Versionen.
Geprüft auf Basis der offiziellen Tabellenkalkulations-Engines von Microsoft und Google.
Core standard function supported across all modern and legacy Microsoft Excel versions (365, 2021, 2019, 2016, 2013, 2010), as well as Excel for the Web and Mac.
100% compatible with Google Sheets. Uses identical argument order, data types, and standard calculation logic.
Häufig gestellte Fragen.
Technische Q&ACan I use ISNUMBER across different worksheets in Excel?↓
Yes. You can reference cells located on other sheets by including the sheet name followed by an exclamation mark, for example: =ISNUMBER(Sheet2!A2:A10). If the sheet name contains spaces, enclose it in single quotes: ='Q1 Report'!A2:A10.
What is the most common reason for errors in ISNUMBER?↓
Numbers imported from databases formatted as text strings (e.g. "1200") return FALSE. Use VALUE(A2) to convert them first.
Does ISNUMBER work identically in Google Sheets?↓
Yes, ISNUMBER is supported in both Microsoft Excel and Google Sheets with standard evaluation behavior.