Calculate Formula Only If Cell Contains a Number

[primerahomes]

Thanks all for the help. I would like a cell D19 to calculate a formula ONLY if cell C19 produces a number, otherwise I would like it to remain clear. I would like cell D19's formula to calculate =C19*D11. How can I do this?

[bryce]

In D19 enter this

=IF(C19<>"",C19*D11,"")

alternatively


=IF(C19="","",C19*D11)

[Dave Hawley]

=if(isnumber(c19),c19*d11,"")