The most popular chain and necklace lengths vary from 40cm to 60cm. The right length for you depends on your personal style and where you would like your necklace to sit. A 40cm chain will generally sit at the base of your neck or just above your collarbone, whereas a 60cm chain will have a longer drop to around mid-chest. Use the below image as an approximate guide to how different chain lengths will look.

If you're styling a layered necklace look, ensure you wear chains in different lengths so that each layer can be seen, and to create a trending tiered look.