When you are running out of yarn

The mustard sweater for Paul might be running into jeopardy. The back is done and the front is done. One sleeve is done to the armhole and that took one skein of yarn. I have 2 skeins lefts and I am hoping that the caps of the sleeve take a little under 100 yards, since each skein is about 230 yards. I know, I know, always buy a little extra, and I usually do! Just a dumb move altogether; hopefully it will work out right. I'll keep all of you posted.