It depends on how thick you want the concrete.
It is 120 times 120 = 14,400 square inches
Concrete is sold in cubic (volume) measurements not square (area) measurements.
how much does concrete cost per square foot
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If it is the same as concrete it will cover 162 square feet. concrete covers 81 square feet by 4" deep
Thisquestion needs clarifying. The question should be 'how much does a CUBIC metre of concrete weigh'. A square metre of concrete would have to have a thickness to make volume.
An 80lb bag of concrete you can at your local home improvement store covers about 4 square foot at 2" thick. So you would need about 144 bags of 80lb concrete.
That is an area measurement, whereas concrete is measured in volume, typically cubic yards in the US. The costs vary widely based on local availiblity of materials and the type of concrete mix. The national average is about $100 for a cubic yard of concrete.
Depends where you are living.
157 pounds
It depends how thick you want it
96 cubic feet of concrete