More than likely you have 1/2" or 5/8" drywall. Remove one of your electrical outlet covers, you should be able to see the depth of the drywall in the gap next to the outlet box.
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A 4x8 sheet is about 70 pounds.
A 4x8 is about 25 pounds - and very fragile.
One sheet of the new 'Light' 4x8 x 1/2 inch is about 32 pounds. The old one (probably still sold in some areas ) is 54 pounds.
It is used for archway ceilings or a archways in a hall. The general purpose of 1/4" is for any wall or surface that is not flat. Round walls, coved ceilings.
You must get the units to cancel out; for example 12 inch * 1 foot/12 inch the inch cancels and leaves the answer in feet which is 1.