Paddle length is a personal thing but from our experience the measurements above work best for MOST people.
If unsure - start out longer - you can always shorten it (but never lengthen your paddle, again)

    * A longer shaft puts less strain on your back (but may aggravate shoulder injuries)
    * Most people start out spending more time on flat water, where a longer paddle works best
    * As you develop paddle strength and move into the surf you can shorten it


Hope that helps