20 Inch Hair Extensions: How Long Are They Really?

Updated 2026-09-25. By Devan, hair extension specialist.

20 inch hair extensions usually fall around the bra strap to mid back on an average height woman, because the length is measured from the attachment point, not your scalp. For full ends at 20 inches most people need 2 packs of tape-ins or 150g of weft.

Where do different lengths fall?

Approximate finish on an average height adult:

LengthWhere it falls
16 inShoulder to collarbone
18 inBelow the shoulder blades
20 inBra strap to mid back
22 inMid back
24 inLower back

Questions

What is the most popular length?

18 and 20 inches are the most requested lengths for a natural result.

Fremont Hair Extensions, private studio at 2033 Gateway Pl, 5th Floor, San Jose, CA 95110, about 15 minutes from Fremont. By appointment, 10am to 7pm daily. Phone (510) 491 9651.