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Geodesic Dome Calculator

  • 3V Dome
  • 4V Dome
  • 5V Dome
  • 6V Dome

 

 

This calculator is to be used with the 1/2" Sonostar geohubs ONLY.  For Megahub calculations, use the Megahub Calculator in the Information table to the left.

All the lengths of pipe for the triangles that make up a geodesic dome are not the same. There are trigonometric equations used to calculate the different lengths, but to make it easy, we've incorporated all that into the simple calculator on this page. First, on this page, choose the complexity of the dome you want to build. If you don't know what 'frequency' means, or the difference between a '3V' and a '6V', go to the FAQ's page and that will explain it. Once you get to the next page, all you do is put the radius of the dome you want to build into the open square, and then hit the orange 'calculate' button next to it. Below it, you'll see all the lengths for any frequency 3, 4, 5, or 6 dome you want to build.

* Please note that in calculating the lengths of the struts, 2.28 inches has ALREADY been deducted to account for the width of the hardcore geohubs.

Radius: ft.
LengthColor#
A - Yellow 30
B - Blue 55
C - Red 80
4 Star base hardcore geohub 15
5 Star hardcore geohub 6
6 Star hardcore geohub 40
Diameter -
3V Dome

Dome Calculator for 3V

The obvious reason to choose building a 3V dome is the simplicity of it: there’s only 3 different lengths of pipe, and 3 kinds of hubs. It creates a dome that has good lines, and if you want that angular/polyhedron look, then this is the right way to go. The cost is low, and the time to assemble is the shortest of all. It’s a good first dome to build if you’ve never built one before. A lot of people build these out of steel for climbing, but don’t even think of climbing on a 3V dome made of PVC.

Radius: ft.
LengthColor#
A - Yellow 30
B - Red 30
C - Blue 60
D - Green 70
E - Purple 30
F - Orange 30
4 Star base hardcore geohub 20
5 Star hardcore geohub 6
6 Star hardcore geohub 65
Diameter -

Dome Calculator for 4V

The stakes go up with the 4V Dome. Now there’s 6 different lengths of pipe, and a lot more of them than on the 3V dome. The positives are that it’s structurally stronger, because the stress is spread over more joints, and it more closely approximates a sphere. Ideal for greenhouses, storage sheds, and refugee shelters.

Radius: ft.
LengthColor#
A - Yellow 30
B - Blue 30
C - Red 60
D - Purple 70
E - Green 70
F - Orange 80
G - Pink 35
H - Tourquoise 30
I - Brown 20
4 Star base hardcore geohub 25
5 Star hardcore geohub 6
6 Star hardcore geohub 120
Diameter -
5V Dome

Dome Calculator for 5V

The decision to build a 5V Dome must go pretty much like this: “I don’t want to go crazy like the 6V dome with all the pieces it needs, but I want it to be more complex than the 4V”. It is definitely stronger than the 4V, is more impressive looking, and comes even closer to resembling a sphere. The final result is worth the extra work.

Radius: ft.
LengthColor#
A - Yellow 30
B - Blue 30
C - Red 60
D - Purple 90
E - Green 30
F - Orange 60
G - Pink 130
H - Tourquoise 65
I - Brown 60
4 Star base hardcore geohub 30
5 Star hardcore geohub 6
6 Star hardcore geohub 160
Diameter -
6V Dome

Dome Calculator for 6V

This project is only for serious (and possibly deranged) domophiles. Altogether, there will be 750 parts that go into this dome (555 struts and 195 geohubs), and hours and hours of work cutting pipes and gluing the parts together. It is the strongest of all the domes, and it is the closest to a sphere in overall roundness. It is more than impressive to behold, and your friends will likely start putting a ‘Dr.’ in front of your name when they address you. If you’re married, you’d better plan to live in it. If you’re not married, you probably never will be.