Wand Length

Length is vital to a wand's character and parameters. By theory, the shorter the wand the less "power" it possesses but stronger the control. The longer the wand, the more "power" it has, but weaker the control. It's very simple - a long wand is able to channel more magic from the caster, but due to its length the magic charge will loose precision over time versus the shorter wands that also cast faster, quicker spells. It is also believed that wand length and a wizard's height have some connection, as most of the time shorter wizards have shorter wands while taller wizards have taller wands.

Six To Eight Inches
Considered the shortest length range for wands, with six inches being the shortest made into existence (any lower and you won't have a wand, but a stubble!). Very deft with precision, but not so much in lacking that extra punch in your sucker. Shorter wizards (5'5" and below) will generally have wands in this range.

Nine To Ten Inches
Very standard, and very formal. Most wizards and witches aim for this moderate range that boasts a nice balance between aim and ammo. It's long enough to create that nice swish and flick for Charms. Typically, wizards of average height (5' 6" - 6' 0") will have wands in this size range.

Eleven To Thirteen Inches
By this point, eleven to thirteen inches are considered rather long wands. Many Dark Wizards prefer long wands, either for Cursing the limbs off their poor victims or simply prodding each other into annoyance. Not very friendly with precision though, it takes a strong wizard with a strong grip in order to get that spell out right. Taller wizards (6' 0" and over) will generally have wands in this area.

Fourteen To Eighteen Inches
There was once a wizard with a very small wand, and to overcompensate he decided to craft himself a big cannon of a wand. My advice: don't go there. Half-giants are usually the only wizards to have wands this long.