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Balloon Volume

Volumes & Lift Capacity
Diameter
(inches or feet)
Volume
(cubic feet)
Lift Capacity
(ounces or pounds)
9"0.22
10"0.30
11"0.41
12"0.53
16"1.251 oz.
20"2.462 oz.
24"4.244 oz.
28"6.716 oz.
32"10.088 oz.
36"14.311.0 lb.
40"19.591.25 lb.
44"26.171.50 lb.
4'33.922.00 lb.
5'65.254.00 lb.
6'114.507.00 lb.
7'181.812.00 lb.
8'271.418.00 lb.
18" Mylar0.50

Volume Calculations
Volume of a sphere=4.19 x Radius3
or0.53 x Diameter3

Round balloons under 24" have a volume greater than a perfect sphere.
Round balloons greater than or equal to 24" can be considered perfect spheres.

Helium Consumption

Rule of Thumb:
1 cubic foot = 15 p.s.i.
(based on a "K" size - 285 cu.ft. tank)


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