# portfolio returns when portfolio value is negative

I am being very stupid probably but I don't understand the following.

Portfolio 1st Jan valued: -$100 A month later Portfolio 1st Feb valued: -$45

I calculate the return of the portfolio as,

    ((-45 / -100) - 1) * 100 = -55%


But as I see the value of your portfolio has increased since -45 > - 100 so why is the return negative?

• @muffin1974 apologies I made mistake typing the question. I have -45/-100 - 1 – mHelpMe Feb 19 '18 at 14:47

        Cash    Securities  Portfolio Value %Return