I'm afraid not. Even if it would allow you to resize the window itself, it would require that the various controls (buttons) would also be resizable. I found a program called Sizer
that allows changing the calculator's window size but the buttons and display boxes still stayed the same size.
You could temporarily change the screen resolution which would make the calculator bigger on the screen but that isn't a particularly elegant solution.
You could try searching for an alternative 3rd party calculator that is resizable but I personally don't know of any.