How long snowboard should I buy?

it should come up to your chin at the smallest, and to your nose at the tallest. or you can just ask the guy at your local sport shop.

There are several things to consider. Most manufacturers list weight ranges for each size within a particular model so check those when shopping for a new board. If your height and are proportional, you can follow the general rules of sizing. Normally between your chin and nose, but that is just a general rule if you are height / weight proportional. If you are heavier, get a longer board - if lighter, get a shorter board. Where do you like to ride? A shorter board will be easier to make quick turns in the park but won't ride as nice at higher speeds out on the runs. If you have size 11 or larger, you will probably need a "wide" board - you don't want your toes and heels to drag when turning. If you are right at size 11 like many of us, put your boots on the board and see how far they hang over. You can get bindings with "lifters" built in that lift your boot higher off the board and prevent your boot from touching in most conditions. Good Luck

well mines 152 and im 5 ft 2, so....

Well, in general, your snowboard should be as tall as about your nose. A little shorter if you are into rails and jumps. So if you just like to ride, I would reccomend a 156-158. If you are into terrain parks and such, a shorter board would be better such as a 152-155 Hope this helps you out. =]