No that bad, but you can improve the next two main points:

1) Option to choose the currencies we want to convert to. Having all of them is exhausting when looking for the right one we want, so please allow us to choose the currencies we need.

2) If you add an option to open the results in an external window, that god be very useful! Sometimes we need to continue surfing the net, but then the results disappears and we have to write the amount again and convert!