How much helium do I need for my event?
Latex Balloon Helium Usage Chart

Size of Balloon
Cubic Feet of Helium Needed
Average Floating Time
9″ .25 cubic feet 12-16 hours
11″ .50 cubic feet 16-24 hours
16″ 1.3 cubic feet 30+ hours


For Example-  If you need to inflate 140- 11″ latex balloons.  Each 11″ latex balloons needs .50 cubic feet.  140 balloons  x .50 cubic feet  =  A total of 70 cubic feet is needed for your event.