How much shampoo do you use?

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My question is how much shampoo do you use when applying? My girlfriend says the norm is a quarter size amount, but how much exactly is a quarter size? Can you eyeball a quarter amount in your hand and get the thickness the same as a quarter or does it just mean the diameter of a quarter? How much shampoo do you apply in reference to a quarter size; is it based on diameter, thickness, or both?
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spunkmonkey spunkmonkey
I use next to none, I have very short hair. One bottle will last me six months.
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Unique posters: 2