Helium Balloon Calculator
Find out how much helium a set of balloons needs. Enter how many balloons you want and how wide each one is when full, and the total gas volume appears.
- Free
- Works offline after your first visit
- Saves on this device
- No sign-up
- Updated
How it works
Each balloon is treated as a sphere. Its volume is four thirds times pi times its radius cubed. Multiply that by the number of balloons.
Balloons are rarely filled to a perfect sphere, so treat the answer as a little high. Compare it with the volume printed on your helium tank before you buy.
Worked example
25 balloons, each 11 in across, need 10.08 ft³ of helium.
Questions
How wide is a standard party balloon?
A common latex party balloon is about 11 inches across when full, but sizes vary, so measure one if you can.
Is this the size of the tank I need?
No. It is the gas volume. Compare it with the volume on a tank's label, and buy a little extra.
Does a bigger balloon need much more?
Yes. The volume grows with the cube of the width, so a 22 inch balloon takes about eight times the gas of an 11 inch one.
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