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This category collects pages that use the formatnum parser function with a non-numeric or incorrectly formatted value, e.g. {{formatnum:foo}} or {{formatnum:12,345}}.
Ways to fix or work around this error inside template code:
- If
formatnumis being applied to a string that includes both a number and words, change it to wrap just the number. Example:{{formatnum:{{{var}}} dollars}}→{{formatnum:{{{var}}}}} dollars - Another way to work around invalid input is to remove commas from the input like this:
{{formatnum:{{replace|{{{var}}}|,|}}}}. Note that input using commas as decimal separators, in contravention of en:MOS:DECIMAL, will cause formatnum to produce invalid values. To fix the problem, use a full stop (period) as a decimal separator. - A limited way to work around invalid input in templates is to use {{digits}}, e.g.
{{formatnum:{{digits|{{{votes}}}}}}}. This works only for whole numbers and will produce incorrect results for input containing decimal points or other non-numeric characters.
Ways to fix this error in articles:
- When additional text or references exists in a template parameter that expects only numbers, find a way to move the additional text outside the template or into a different parameter. For example:
- Currency templates like {{CAD}} or {{US$}} take only numeric input. Use
{{US$|123}}{{nbsp}}millioninstead of{{US$|123 million}} - The
|population_total=parameter in {{Infobox settlement}} should have only a number in it. Move any references to|population_footnotes=, as in this edit.
- Currency templates like {{CAD}} or {{US$}} take only numeric input. Use
Other:
- When
formatnumis given a negative number written with the proper U+2212 "minus sign" (instead of the commonly used hyphen-minus key that appears on most keyboards), e.g.{{formatnum:−9000000}}, it assigns this error category; see T237467. A workaround for this incorrect usage was applied to {{US Census population}}, which shows population declines as negative numbers. You should use hyphen-minus withinformatnumto avoid this error category and it will output the proper minus sign (see T10327).