You need 350 to 400 cfm per ton (12,000 btu) of cooling. So, divide your cfm by 400. For example, a 1200 cfm blower on an air handler could handler up to 3 tons. All calculations depend on your duct being the proper size for the equipment.
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Length x width x depth in inches. Then x .00625 = tons
You do not. A square metre is a measure of area whereas a ton is a measure of mass. The two are measures of two different things and there can be no conversion between the two without a lot of additional information.
Net Tonnage
This question cannot be answered sensibly. A yard is a measure of distance, with dimensions [L]. A tonne is a measure of mass, with dimensions [M]. Basic dimensional analysis teaches that you cannot convert between measures with different dimensions such as these without additional information. As an exception, some building materials (sand, gravel, core, cememt) are sold in "yards". Technically they are not yards but cubic yards - a volume. And to convert that volume into tonnage you need to know the density of the material.
The numerical value is 66332.