Oops, it's http://www.freepascal.org/docs-html/rtl/sysutils/strtofloat.html of course. Or http://www.freepascal.org/docs-html/rtl/sysutils/trystrtofloat.html if you don't want an exception if the conversion fails.
It look like "Function TryStrToFloat(Const S : String; Out Value: Extended): Boolean" (extended version) is not documented. Is this because it's a 2.3.1 function or because it is not posible on all CPU's?

-Torsten.
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