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HELIUM has a lift of .84 ounces per cubic foot at
sea level.
To determine the volume of a balloon in cubic
feet, multiply the cube of the radius in inches by 1.333, multiply
the result by 3.1416, and then divide by 1728.
To determine the lift of a helium filled balloon,
multiply the volume in cubic feet by .84 to determine ounces, Divide
ounces by 16 to determine pounds.
Lift is reduced approximately 7.5% for each 1000
feet above sea-level.
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Round Latex Balloons
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Balloon Size
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Approximate Volume
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Approximate Lift
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Approximate Flying Time
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7 inches
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.104 cu. ft.
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.087 ounce
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3 to 5 hours
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8 inches
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.155 cu.ft.
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.130 ounce
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4 to 6 hours
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9 inches
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.221 cu. ft.
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.186 ounce
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8 to 14 hours
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10 inches
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.303 cu. ft.
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.254 ounce
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16 to 18 hours
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11 inches
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.403 cu. ft.
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.339 ounce
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18 to 24 hours
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12 inches
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.523 cu. ft.
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.440 ounce
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22 to 28 hours
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13 inches
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.666 cu. ft.
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.559 ounce
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24 to 30 hours
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14 inches
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.831 cu. ft.
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.698 ounce
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26 to 34 hours
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15 inches
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1.022 cu. ft.
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.859 ounce
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30 to 42 hours
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16 inches
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1.241 cu. ft.
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1.042 ounces
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36 to 48 hours
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18 inches
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1.767 cu. ft.
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1.484 ounces
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42 to 54 hours
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24 inches
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4.188 cu. ft.
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3.518 ounces
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2 to 3 days
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30 inches
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8.179 cu. ft.
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6.871 ounces
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3 to 4 days
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36 inches
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14.134 cu. ft.
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11.872 ounces
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4 to 5 days
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40 inches
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19.388 cu. ft.
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1 pound .286 ounces
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5 to 6 days
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4 feet
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33.502 cu. ft.
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1 pound 12.142 ounces
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6 to 7 days
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5 feet
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65.434 cu. ft.
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3 pounds 6.964 ounces
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7 to 8 days
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6 feet
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113.069 cu. ft.
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5 pounds 14.978 ounces
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8 to 9 days
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8 feet
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268.016 cu. ft.
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16 pounds 12.016 ounces
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8 to 10 days
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12 feet
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904.555 cu. ft.
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47 pounds 7.826 ounces
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12 to 14 days
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20 feet
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4187.753 cu. ft.
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219 pounds 13.712 ounces
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16 to 21 days
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Heart Shaped Balloons
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Balloon Size
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Approximate Volume
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Approximate Lift
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Approximate Flying Time
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11 inch
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.35 cu. ft.
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.294 ounce
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8 to 10 hours
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17 inch
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1.00 cu. ft.
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.840 ounce
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18 to 24 hours
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36 inch
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15.66 cu. ft.
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13.155 ounces
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3 to 4 days
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Geo® Heart
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.35 ounce
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.294 ounce
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8 to 10 hours
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Geo® Donut and Blossom Balloons
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Balloon Size
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Approximate Volume
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Approximate Lift
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Approximate Flying Time
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16 inch
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.50 cu. ft.
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.420 ounce
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16 to 20 hours
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The information contained in this chart is
computed at sea-level and is approximate.
Volume may vary due to over-inflation or
under-inflation of the balloon.
Lift, and flying time are effected by such things
as helium quality, weather, humidity, temperature, atmospheric
conditions, and elevation above sea-level. As a "rule of thumb",
reduce lift and flying time by 7.5% for each 1000 feet above
sea-level.
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