a good general rule is to get skis that are about the same height as you are. The shorter they are, the more control you will have; the longer, the faster they are. If you are a beginner, go with some skis that are shorter than you. Note: this is assuming you are skiing shaped or parabolic skis (any new skis will be this type)
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Ski size is determined by a combination of height, weight, and ability level. To determine what size ski will best suit you, it is easiest to use an online ski sizing chart such as http://www.sizingskis.com
Note that many ski charts you find online are not correct, as they are meant to be used for the older style straight skis. The new parabolic skis allow you more surface area in a smaller length, so you need a ski chart which reflects this.
Lay a tape-measure on the floor flat. Then place your board on top of it, top-down. Measure in CM from tip to tip. This will give you a good general idea. The real truth about it is that there is no standard way. Some manufacturers do it like that, and others measure the actual length of the material (along the bottom/curved side). Next time you hit the shop, look up two or three boards of the same "length" from separate manufacturers. The actual height of the boards, when you hold them up to your chest, will vary. This is because of the varying modes of measurement, as well as the amount/degree of curve. The width of a board is measured one time across the center or most-narrow section.
The effective edge of a board is the portion on the bottom (waxed part), between the beginning of the nose-flare (curve) and the beginning of the tail-flare.
* Most boards have the length written on the top-side. It may be part of the graphics and written in only the last two digits (157 = 57)
** Most buyers only care about length, because they already know what else they're looking for/at.
Middian
Use a measuring tape. If you're wondering how snowboard length is derived, it's a point-to-point measurement from the tip to tail. Measurements are provided in centimeters, so a "161" is 161 cm from tip to tail. If, for some reason, the board is not clearly marked, this is how you'd establish its length. Step 2
Determine your size. The numbered size of a snowboard is a useless figure unless you know the size that you need. If you're new to Snowboarding, you probably have no idea. The snowboard size required by a given rider is based primarily on height and weight, with some secondary emphasis on what type of riding will be done. Refer to manufacturer's guidelines for recommended sizes based on your height and weight. Step 3
Rough it. If you're of average weight, a simple rule for determining size is that the snowboard should come up between your chin and nose. Stay on the smaller side for freestyle riding and go longer for free riding and powder riding. If you're a beginner, aim for a smaller board between your chest and chin. Because this rough measurement doesn't take weight into account, it's not useful if you're over or under average weight for your height.
Its very simply about the angle of the arm when you hold your ski pole upside down, see the link below.