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Generally plywood comes in a 4' x 8' sheet which is 24 square feet...meaning 1 sheet is all you need for 18 square ft.
The easiest way to determine an honest weight of a 4' x 8' sheet of plywood? 20-25 pounds per 1/4" of thickness. 3 pounds per square foot per inch of thickness according to APA Plywood Design Specification.
A 4x8 sheet of plywood covers 32 sq feet. You need to cover 16x18 which equals 288 sq feet. Divide 288 by 32 and you will need 9 pieces of plywood. However, don't forget to add for waste. Usually 10-15% unless your room is without obstructions, walls, etc. For this job, you may need at least (1) additional sheet to complete the project.
8 ft * 4 ft * 6 mm = 64 sq ft * 8 mm = 5.95 sq metres * 0.008 m = 0.048 m3.
2 1/2 pints