# Thread: Column Area is Wrong

1. ## Column Area is Wrong

HI all,

I noticed something today when looking through my Navisworks file, the areas for the columns seems to be wrong.

The image below show a 500mm x 500mm x 5000mm column, so by my calculation the surface area should be 10.50m2
Single side (.5m x 5m = 2.5m2)
4 sides (2.5m2 x 4 = 10m2)
Top (.5 x .5 = 0.25m2)
Base (.5 x .5 = 0.25m2)

10 + .25 + .25 = 10.5m2

Navisworks is telling me that the Area is half of that ie 5.25m2

Have I missed something here? Why would this be?

2. SA=2 x (l x w + l x h + w x h)

SA=2 x (500 x 500 + 500 x 5000 + 500 x 5000)
SA=2 x 2625000
SA=5250000 square millimeters

1 mm2 = .000001 m2

So 5.25 m2 is correct

Square area is L X W....you multiplied 2L x 2W when figuring your sides.

EDIT.... Reworking own results above and I get 10.5... grrr

3. I make it 10.5m2 like Andrew.

4. Well....I get 10.5 too. All I can think is Navis is showing the area that is exposed vs the total area.

5. No, as in my my paper-maths makes it 10.5m2 - I don't follow your first post's math logic.

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