length of rafters

[REGULAR GUY]

Howdy all,  I think/ hope I'm in the right place. I'm building a barn, 34' by 60'.  On a 4:12 slope, what lengths do I need to cut my rafters? I come up with 18'5". I'd like to confirm with ya'll. The width being 34'.   Thanks in advance. Regular Guy

[Ljohnsaw]

Hm, my math may be a but rusty, but I come up with 17' 11" plus whatever overhang you want less 1/2 your ridge beam width (if any).  [((34/2)/12*4)^2+(34/2)^2]^(1/2)

[LeeB]

Same thing I came up with. Here's an easy way.
http://www.pole-barn.info/roof-rafter-calculations.html
Google rafter calculater. There are lots of them.

[REGULAR GUY]

Gents, Thanks A lot, I forgot that I was figuring 6" for overhang, so we're on the mark. Sorry for not statin ahead of time. IJohnsaw, we recently moved from Pioneer, Ca. (off highway 88) to So. East Mo., Calif. has beautiful country but it's a police state. Hope your doin good up there.  LeeB, I know the feeling, I'm a proud Virginian living in the Ozarks.  "American by birth, Southern by the Grace of God"......there's good people all over.  Thanks again fellas and God Bless.  Regular Guy