topic Re: Difference in square footage calculation between revit and Autocad in Revit Architecture Forum

Difference in square footage calculation between revit and Autocad

Anonymous — Tue, 18 Oct 2016 19:13:33 GMT

We have a situation between landlord, architect, tenant and tenant architect that is causing some problems. The landlord architect created their drawings in revit, exported it to autocad and determined the rentable SF that way. We took their autocad file in revit, and using the exact same geometries to calculate square footage, got a different number. they are off by about 120 sqft, but just wondering what is causing this and which is more accurate.

Thank You

Re: Difference in square footage calculation between revit and Autocad

ToanDN — Tue, 18 Oct 2016 19:45:24 GMT

There is not enough information. How did they calculate the area in AutoCAD? Tracing a polyline over the exported geometries? How did you calculate the area in Revit? Tracing Area boundary lines over the CAD geometries?

Re: Difference in square footage calculation between revit and Autocad

Anonymous — Tue, 18 Oct 2016 19:55:32 GMT

They calculated it using a poly line. I overlayed their poly line geometries into the revit file. I calculated the square footage in revit two ways, Using both area plans and a simple shaded regions. Both of my revit ones come out the same, which is still less than what is in the AutoCAD way they got their number. Does that help?

Re: Difference in square footage calculation between revit and Autocad

barthbradley — Tue, 18 Oct 2016 20:42:07 GMT

2D or 3D polyline? My guess: 3D. Convert it to a 2D.

Re: Difference in square footage calculation between revit and Autocad

ToanDN — Tue, 18 Oct 2016 22:56:45 GMT

I assume you have already tried to open the DWG file in AutoCAD to verify the area yourself, and not relied on what they have told you?

Re: Difference in square footage calculation between revit and Autocad

yassin.tatar97 — Tue, 12 Jul 2022 04:17:02 GMT

we have the same situation, have you find the sollution?