If you have a plane that weighs 99 oz. and has a wing area of say 750 sq. in here is the math.....

750/144= 5.208333333

Now divide the weight (99 oz.) by 5.2083333 and you should get something like 19.00000 and that will be your wing loading - about 19 oz. per one square foot of area.

Hope this helps.

Jerry