As a general rule, your jump rope handles should come up to your armpits when standing in the centre of your rope. For beginners using a beaded rope, it's easier for the rope to be slightly longer. Once you start getting used to the rope and improve your skills and form, you may want to shorten your rope so it reaches the middle of your rib cage. Start with a longer rope and work your way down. It's all about what you're comfortable with!
Below is a sizing chart to use as reference when purchasing your jump rope.
LENGTH OF ROPE / HEIGHT OF JUMPER
7 ft for jumpers 4' to 4' 9"
8 ft for jumpers 4' 10" to 5' 3"
9 ft for jumpers 5' 4" to 5' 11"
10 ft for jumpers 6' to 6' 4"
11 ft for jumpers 6' 4" +