This was a bit smaller than I had hoped, but than again, I didn't properly measure! Since it's a corner desk, I wasn't sure how the company measured, either. After it got here and was assembled, I did measure and it IS 42" measuring from the left corner (where it touches the wall) to right corner (where it touches the wall), going straight across the top of the desk. It's about 29" from the back corner (where it touches the corner of the wall) straight across the top of the desk to the front drawer of the desk. Sorry if that's more confusing, it's an odd shaped piece. But is a great size if you have a really, really small space. My 22" flat screen monitor, speakers and keyboard fits perfect, but not room for much else.