How long is 18 inch hair, really? Measured straight, from the crown down, 18" falls just past the shoulders, heading toward the underarm on an average 5'5" frame.
Texture changes everything. Length is always measured straight, so curl pattern shortens what you actually see in the mirror. Body wave and loose wave lose roughly 1 to 2 inches. Deep wave, kinky curly and afro kinky can take 3 to 4 inches off, so 18" in deep wave wears closer to 14" to 15". If you want just past the shoulders in a curly texture, size up two inches.
How many bundles do you need at 18"? Plan on 3 bundles for a full sew-in. The rule of thumb: 10 to 12 inches needs 2 bundles, 14 to 22 inches needs 3, and 24 inches and longer needs 4 because the wefts thin out as they get longer. Add a closure or frontal for a seamless part.
Who it suits. 18 inch is just past the shoulders — the sweet spot between manageable and dramatic, and the safest bet when you are buying for someone else. Want the full visual breakdown? Read our guide to 18 inch hair.
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