Also these could be of some help.

There's 16 ounces in a lb. And there's 144 sq. in. in a sq. ft.

So figure your area by multiplying span by chord. Ex. 12"chord 48" wingspan = 576 sq. in. Now divide by 144 to get sq.ft. which equals 4 sq. ft.

Then figure your weight in oz. So lets say 3 lbs 9 oz. 3x16 = 48 oz. added to 9 oz. = 57 oz.

Now that you have those two numbers you can find your wingloading in oz./sq.ft. Which would be 57 oz. divided by 4 which comes to 14.25. So your wingloading is 14.25 ounces per square foot.

Hope that made it simple.

Josh