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Helium balloons Flying Time explained

The basic formula to work out the helium balloons flying time the following:

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.

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.

Round Latex Balloons
Balloon Size
Approximate Volume
Approximate Lift
Approximate Flying Time
7 inches
.104 cu. ft.
.087 ounce
3 to 5 hours
8 inches
.155 cu.ft.
.130 ounce
4 to 6 hours
9 inches
.221 cu. ft.
.186 ounce
8 to 14 hours
10 inches
.303 cu. ft.
.254 ounce
16 to 18 hours
11 inches
.403 cu. ft.
.339 ounce
18 to 24 hours
12 inches
.523 cu. ft.
.440 ounce
22 to 28 hours
13 inches
.666 cu. ft.
.559 ounce
24 to 30 hours
14 inches
.831 cu. ft.
.698 ounce
26 to 34 hours
15 inches
1.022 cu. ft.
.859 ounce
30 to 42 hours
16 inches
1.241 cu. ft.
1.042 ounces
36 to 48 hours
18 inches
1.767 cu. ft.
1.484 ounces
42 to 54 hours
24 inches
4.188 cu. ft.
3.518 ounces
2 to 3 days
30 inches
8.179 cu. ft.
6.871 ounces
3 to 4 days
36 inches
14.134 cu. ft.
11.872 ounces
4 to 5 days
Heart Shaped Balloons
Balloon Size
Approximate Volume
Approximate Lift
Approximate Flying Time
11 inch
.35 cu. ft.
.294 ounce
8 to 10 hours
17 inch
1.00 cu. ft.
.840 ounce
18 to 24 hours
36 inch
15.66 cu. ft.
13.155 ounces
3 to 4 days
Geo® Heart
.35 cu. ft.
.294 ounce
8 to 10 hours
Geo® Donut and Blossom Balloons
Balloon Size
Approximate Volume
Approximate Lift
Approximate Flying Time
16 inch
.50 cu. ft.
.420 ounce
16 to 20 hours

                            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.

Increase flying time of balloons

If you want to increase the flying time of helium inflated party balloons we recommend using Hi-Float solution.
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