Before you start: Pin hair as flat and as tight as possible before taking the measurements. This will eliminate bulges that distort head contours.
1. Circumference:

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Measure all around the head. Position tape measure so its edge follows the hair line around the head and nape of the neck. (Average measurement is 22 inches)
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2. Forehead to Nape:
Measure from hairline at center of forehead straight back over crown to center of hairline at nape of neck. (Average measurement is 13 1/2 inches).
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3. Ear to Ear Across Front Hairline:

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At front of ear, measure from hairline at base of sideburn, up across the hair line along forehead to same point in front of other ear. (Average measurement is 11 1/2 inches).
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4. Ear to Ear Over Top:
Measure from hairline directly above the ear across top of head to the hairline directly above the other ear. (Average measurement is 11 inches).
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5.Temple to Temple Around Back

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From temple to temple across the back of head. (Average measurement is 14 inches).
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6.Nape of Neck
Measure the width of hairline across the nape of the neck (Average measurement is 6 inches).
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7.) Select the length you want

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