Receiving mismatch type error

The user inputs a scaling factor into a text box, which is then multiplied into a column of data. We tried the following code, but received an error "mismatch type". How do we convert txtScaleFactor.Value to a number? We think the problem is that it sees this as a string, instead of a number. Thanks.

'Now scaling desired range
For Each iCell In fCol.Cells
iCell.Value = (txtScaleFactor.Value) * (fCol.Offset(0, 1).Value)
Next