Each chain in my shop will have a sizing chart, but these general guidelines can help you decide on your personal necklace length:For Men:~ 18" on most men this length will usually be a choker, too tight and uncomfortable~ 20" worn inside or outside of your shirt, hits at about the collar bone~ 22" good length for a small to medium sized pendant, a few inches below the collar bone~ 24" another good length for pendants, will fall over necklines including v-necks~ 26" to 28" worn alone or with a medium to large pendant~ 30" falls about mid-chest and works well with large pendants~ 32"+ usually going to be statement chains, great for layering many lengthsFor Women:~ 16" will be a choker on most women~ 18" falls below the throat at about the collar bone, tiny and small pendants work for this length~ 20" works well with small to medium pendants, falls a few inches below the collar bone~ 22" sits at about mid-chest, small to medium pendants look good here~ 24" heart level with medium to large pendants~ 26" to 30" usually going to be front and center on busty women~ 32" to 36" longish lengths, worn plain or with large pendants