A standard board is usally 31-33" long. Usally the shorter the skater the shorter the board. The lenght of a skateboard is personal preference. Over time a skater will find out what size board works best for them. It is kinda hard to go wrong with length any standard board is appropriate.
Really whatever feels comfortable. If it feels right. Get it. CCS.com has very nice skateboards in a variety of lengths and widths.
A standard board is usally 31-33" long. Usally the shorter the skater the shorter the board. The lenght of a skateboard is personal preference. Over time a skater will find out what size board works best for them. It is kinda hard to go wrong with length any standard board is appropriate.
inches
A tenth of a metre.
feet
Meters
millimeter
Feet
feet
Inches
The most appropriate measure is a metre.
Grams is no good - it is a measure of weight not length. Kilometers measure length - but only if your table-top is a few miles long. Most appropriate would be Meters - your average dining table is about one-and-a-half meters long.
Probably kilometers or miles :)