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**1. Select Hub Size:**
**Select "No Hubs"** to get the true "chord" length for each strut, which is the full distance for the strut between each geodesic dome vertex.

For most dome construction methods, you will use the "No Hubs" selection.

With our Zip Tie Domes Hub Design, the geodesic dome vertex is located in the middle of our "Center Ring".

When using our Hubs, the width of our Center Ring must be added to the strut length to give the true geodesic dome dimensions.
**Select Standard 4" Hubs** for calculating domes with our 4" Standard Hubs or Dual Covering Hubs, which have a 2.375" Center Ring. These hubs are used with 1" PVC pipe for struts.
**Select Super 6" Hubs** for calculating domes with our new 6" Super Hubs, which have a 3.5" Center Ring. These hubs are used with 1.5" PVC pipe for struts.
**Select Mega 8" Hubs** for calculating domes with our proposed 8" Mega Hubs, which will have a 4.5" Center Ring. These hubs will be used with 2" PVC pipe for struts.

**2. Feet or Meters**

Click the button for "Meters" if you are using metric measurements.

**3. Data Entry:**

Enter a number with or without a decimal fraction in **any** of the number fields on the left. (For example, enter "5" or "3.3333")

Click the Calculate Button. All of the other numbers will be automatically calculated.
__The Blue Struts are always the longest struts__. If you know your longest strut length, enter your data for the longest strut length in the Blue Strut field.

To build a strong dome, the longest strut should not be more than 6' long.

**Cost Calculation and Material Utilization Chart**

The default "Length of Pipe" for cutting your struts has been set to 10'. You can change this to 20' or whatever length of pipe you have to cut for your struts.

You can also update the "Cost Per Pipe" amount, and click the Calculate field, and the "Total Cost of Materials" amount will be calculated at the bottom of this section.

If you are cutting 4' struts, consider using 20' lengths of pipe, as there will be less waste as compared to cutting 4' lengths from 10' pipe.

**Note:** The geometry of this dome differs from that of other 4v domes based on the icosahedron. The triangle subdivision, which results in only four strut lengths, was devised by Gerry Toomey, a dome consultant in Quebec, Canada, and is used here with his permission.

4v Icosahedron

Length of Pipe:

Cost Per Pipe:

Red "A" Strut Units Entered:

0

Feet and Inches:

0'0"

Number of Pipes needed to Create (60) Red "A" Struts:

0

Number of Red "A" Struts Produced From Each Uncut Pipe:

0

Waste for First 0 Pipes after Cutting 0 Struts Each:

0 = 00"

<-

Number of Red "A" Struts Created from the first 0 Pipes:

0

Number of Red "A" Struts Created from the Last Pipe:

0

Waste on the Last Pipe after Cutting 0 Strut(s):

0

<-

Total Waste in Creating 60 Red "A" Struts:

0

Blue "B" Strut Units Entered:

0

Feet and Inches:

0'0"

Number of Pipes needed to Create (60) Blue "B" Struts:

0

Number of Blue "B" Struts Produced From Each Uncut Pipe:

0

Waste for First 0 Pipes after Cutting 0 Struts Each:

0 = 00"

<-

Number of Blue "B" Struts Created from the first 0 Pipes:

0

Number of Blue "B" Struts Created from the Last Pipe:

0

Waste on the Last Pipe after Cutting 0 Strut(s):

0

<-

Total Waste in Creating 60 Blue "B" Struts:

0

Black "C" Strut Units Entered:

0

Feet and Inches:

0'0"

Number of Pipes needed to Create (60) Black"C" Struts:

0

Number of Black "C" Struts Produced From Each Uncut Pipe:

0

Waste for First 0 Pipes after Cutting 0 Struts Each:

0 = 00"

<-

Number of Black "C" Struts Created from the first 0 Pipes:

0

Number of Black "C" Struts Created from the Last Pipe:

0

Waste on the Last Pipe after Cutting 0 Strut(s):

0

<-

Total Waste in Creating 60 Black "C" Struts:

0

Yellow "D" Strut Units Entered:

0

Feet and Inches:

0'0"

Number of Pipes needed to Create (70) Yellow "D" Struts:

0

Number of Yellow "D" Struts Produced From Each Uncut Pipe:

0

Waste for First 0 Pipes after Cutting 0 Struts Each:

0 = 00"

<-

Number of Yellow "D" Struts Created from the first 0 Pipes:

0

Number of Yellow "D" Struts Created from the Last Pipe:

0

Waste on the Last Pipe after Cutting 0 Strut(s):

0

<-

Total Waste in Creating 70 Yellow "D" Struts:

0

Total Waste for All Struts:

0

Number of Uncut Pipe/Materials Needed:

0

Total Cost of Materials @ $4.50 Each:

$

Weight Chart | 1" PVC Sch.40 | 1" PVC Sch.80 | 1" PVC Sch.80 | 1.5" PVC Sch.40 | 3/4" EMT | 1" EMT | 5/8" Iron Rebar #5 | 3/4" Iron Rebar #6 | 1/2" Basalt Rebar #4 | 5/8" Basalt Rebar #5 |
---|---|---|---|---|---|---|---|---|---|---|

Lbs Per Linear Ft | .32 | .41 | .51 | .68 | .435 | .64 | 1.043 | 1.502 | .237 | .46 |

60 "A" Struts | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |

60 "B" Struts | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |

60 "C" Struts | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |

70 "D" Struts | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |

Total Weight of Struts (lbs) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |

Weight of Hubs, Rings, Zip Ties | 51.7 | 51.7 | 128.3 | 230.0 | 51.7 | 51.7 | 51.7 | 51.7 | 51.7 | 51.7 |

Total Dome Weight (lbs) | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |

This Dome Calculator was written in June, 2016

by johnhurt.com

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*Alba gu bráth - Scotland Until Judgment*

Scots, wha hae wi' Wallace bled,

Scots, wham Bruce has aften led;

Welcome to your gory bed,

Or to victory!

Now's the day, and now's the hour;

See the front o' battle lour;

See approach proud Edward's power—

Chains and slavery!

Wha will be a traitor knave?

Wha can fill a coward's grave!

Wha sae base as be a slave?

Let him turn and flee!

Wha for Scotland's king and law

Freedom's sword will strongly draw,

Freeman stand, or freeman fa',

Let him follow me!

By oppression's woes and pains!

By your sons in servile chains!

We will drain our dearest veins,

But they shall be free!

Lay the proud usurpers low!

Tyrants fall in every foe!

Liberty's in every blow!—

Let us do or die!

Robert Burns - 1793