Helium filled balloons Flying Time

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.

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

40 inches

19.388 cu. ft.

1 pound .286 ounces

5 to 6 days

4 feet

33.502 cu. ft.

1 pound 12.142 ounces

6 to 7 days

5 feet

65.434 cu. ft.

3 pounds 6.964 ounces

7 to 8 days

6 feet

113.069 cu. ft.

5 pounds 14.978 ounces

8 to 9 days

8 feet

268.016 cu. ft.

16 pounds 12.016 ounces

8 to 10 days

12 feet

904.555 cu. ft.

47 pounds 7.826 ounces

12 to 14 days

20 feet

4187.753 cu. ft.

219 pounds 13.712 ounces

16 to 21 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 ounce

.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.