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# Konvertere tekst til tal

Defaults settings in Calc converts text inside cells to the respective numeric values if an unambiguous conversion is possible. If no conversion is possible, Calc returns a #VALUE! error.

Only integer numbers including exponent are converted, and ISO 8601 dates and times in their extended formats with separators. Anything else, like fractional numbers with decimal separators or dates other than ISO 8601, is not converted, as the text string would be locale dependent. Leading and trailing blanks are ignored.

De følgende ISO 8601 formater bliver konverteret:

- CCYY-MM-DD

- CCYY-MM-DDThh:mm

- CCYY-MM-DDThh:mm:ss

- CCYY-MM-DDThh:mm:ss,s

- CCYY-MM-DDThh:mm:ss.s

- tt:mm

- tt:mm:ss

- tt:mm:ss,s

- tt:mm:ss.s

Koden CC for århundrede må ikke udelades. I stedet for datoen T og skilletegn for klokkeslæt , kan præcist et mellemrum bruges.

Hvis en dato er givet, skal det være en gyldig kalenderdato i den Gregoianske kalender. I dette tilfælde skal den valgfri tid være i området 00:00 til 23:59:59.99999...

Hvis der kun er givet et tidspunkt, kan det have en værdi for timer, som er større end 24, mens minutter og sekunder værdi på maksimum 59.

The conversion is done for single scalar values only, not within ranges.

The conversion is done for single scalar values, as in =A1+A2, or ="1E2"+1. Cell range arguments are not affected, so SUM(A1:A2) differs from A1+A2 if at least one of the two cells contain a convertible string.

Tekststrenge i formler konverteres også, såsom i ="1999-22-11"+42, som returnerer datoen 42 dage efter d. 22. november, 1999. Beregninger som involverer lokaliserede datoer som tekststrenge i formler returnere en fejl. For eksempel kan de lokaliserede datostrenge "11/22/1999" eller "22.11.1999" ikke bruges i automatisk konvertering.

When using functions where one or more arguments are search criteria strings that represents a regular expression, the first attempt is to convert the string criteria to numbers. For example, ".0" will convert to 0.0 and so on. If successful, the match will not be a regular expression match but a numeric match. However, when switching to a locale where the decimal separator is not the dot makes the regular expression conversion work. To force the evaluation of the regular expression instead of a numeric expression, use some expression that can not be misread as numeric, such as ".[0]" or ".\0" or "(?i).0".

## Eksempel

In A1 enter the text '1e2 (which is converted to the number 100 internally).

In A2 enter =A1+1 (which correctly results in 101).

The formula =SUM(A1:A2), returns 101 instead of 201 because the conversion does not occur in a range, only for single scalar values. Here, '1e2 is treated as string which has value 0 for the SUM function.

=SUM("1E2";1) returns #VALUE! because SUM() and some others that iterate over number sequences explicitly check the argument type.

## Changing the default text to number conversion settings

The text to number conversion can be customized in the Detailed Calculation Settings option.

Relaterede emner

Detailed Calculation Settings

Formatering af tal som tekst

Indtastning af et tal med foranstillede nuller

Formater - Celler - Tal

Formatering af tal med decimaler