When choosing a scooter with the right size for you, there are a few things to consider. First, the height and width of the handlebar. For a comfortable experience the bars should sit around the hip to waist while standing on the deck. When it comes to the width, it is really a matter of personal choice, but it is recommended to be the same as your shoulders.
The length and width of the deck depend more on what you need the scooter for. For example, smaller decks are better for tricks, while larger ones are more comfortable for longer rides.