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### This is also a reverse Trapezium calculator

It will calculate any size of dome and display the lengths for each strut, total amount of material required, the weight of your geodesic dome and even the amount of material to cover your geodesic dome. Enter any value in any yellow box and it will calculate all other corresponding values. For example you can specify a 2-foot length for strut “B” and all other struts and related values will be calculated.

## NOTE:

If you enter a measure in feet, your results are in feet or, in the case of floor area, square feet. Same goes for meters.

When entering in feet, decimals are fractions of a foot or square foot (for example: 2.75 = 2’9″).

Spherical diameter
Floor area
Perimeter
feet of pipe / lumber
NOTE: if you are bolting conduit, regardless of dome size, add an extra 32 feet or 10 meters to total above (based on 3″ or 8cm for each strut)
ANGLE
16 X “A” 10.38°
16 X “B” 7.93°
16 X “C” 4.28°
80 X “D” 11.25°
Total number of struts: 128
For conduit, you can round bend angles to the nearest degree. For timber domes, angles should be to the nearest tenth of a degree.

## Struts are vertex to vertex

That means end to end. But to connect them together with bolts, you need to make them longer to drill holes in them.

## Connecting struts

### If you use hubs

1 X 16-way connectors 48 X 4-way connectors 16 X 3-way connectors
OR
If you bolt struts together
65 bolts
65 nuts
130 washers

## Floor Surface and Capacity

Your calculated floor surface area is
SQUARE FEET/METERS
NOTE: RESULTS IN THIS SECTION ARE BASED ON FEET.

## Capacity

 Concrete Cubic feet Cubic yards 4″ slab 6″ slab 8″ slab Plywood 1/2″ 4′ X 8′ sheets
 Estimated standing capacity Estimated dining capacity Estimated conference capacity

## How much will your Trapezium weigh?

NOTE: RESULTS IN THIS SECTION ARE BASED ON FEET.

1/2″ 3/4″ 1″ 1 1/4″ 1 1/2″ 2″
EMT
Wall thickness 0.042″ 0.049″ 0.057″ 0.065″ 0.065″ 0.065″
Lbs.
kgs.
STEEL SCHEDULE 40
Wall thickness 0.109″ 0.113″ 0.133″ 0.140″ 0.140″ 0.154″
Lbs.
kgs.
ALUMINUM SCHEDULE 40
Wall thickness 0.109″ 0.113″ 0.133″ 0.140″ 0.140″ 0.154″
Lbs.
kgs.
 LUMBER 2″ X 4″ 2″ X 6″ 2″ X 8″ Lbs. Kgs.

## How much will your Trapezium cost?

The tables show sample costs. Material prices vary with suppliers and area.

feet (or meters) of pipe / lumber
NOTE: THIS SECTION ONLY ESTIMATES COST IN FEET.
 Galvanized pipe – Steel Schedule 40 Your estimated pipe dollar cost is: 1/2″ @ \$13 /10′ length 3/4 @ \$17/10′ length 1″ @ \$25 /10′ length 1 1/4″ @ \$34 /10′ length 1 1/2″ @ \$42 /10′ length 2″ @ \$55 /10′ length
 Structure pipe – Aluminum Schedule 40 Your estimated pipe dollar cost is: 1/2″ @ \$ /10′ length 3/4 @ \$ /10′ length 1″ @ \$ /10′ length 1 1/4″ @ \$ /10′ length 1 1/2″ @ \$ /10′ length 2″ @ \$ /10′ length
 Structure pipe – EMT Your estimated pipe dollar cost is: 1/2″ @ \$5.50 /10′ length 3/4 @ \$ 8.80 /10′ length 1″ @ \$18 /10′ length 1 1/4″ @ \$19 /10′ length 1 1/2″ @ \$22 /10′ length 2″ @ \$3 2/10′ length
 Cover: approx. s.f. \$ COST Canvas 20 oz. (\$1/s.f.) Canvas 42 oz (\$1.50/s.f.) Poly 3 mil (\$0.05/s.f.) Poly 6 mil (\$0.06/s.f.) Marine Shrink Wrap 7 mil. (\$0.08/s.f.) Industrial fire-retardant Shrink Wrap 12 mil (\$0.23/s.f.) Aluminet 70% shade cloth (\$0.35/s.f.) Tyvek (housewrap) (\$0.41/s.f.) Plywood 1/2″ (\$25/ 4′ X 8′)
 Wood struts Your estimated wood dollar cost is: 2″X4″ @ \$0.35 foot (avg.) 2″X6″ @ \$0.50 foot (avg.) 2″X8″ @ \$0.70 foot (avg.) Flooring: Plywood 1/2″ (\$25/ 4′ X 8′) OSB 1/2″ (\$9/ 4′ X 8′)

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