How Long Do Helium Balloons Last? Float Times & Tips
May 28, 2026
Bulk Helium for Events & Businesses: A Buyer’s Guide
May 28, 2026
The short answer: it depends on your tank size and the balloons you’re filling. As a general guide, a small disposable helium tank fills around [30] 9-inch latex balloons, a medium tank around [50], and a large refillable cylinder can fill several hundred. Larger balloons and foil balloons use more helium, so you’ll get fewer of them from the same tank.
Here’s the full breakdown so you can buy the right tank first time.
Balloon capacity by tank size
Always check the capacity printed on your specific tank — figures vary by brand. As a rough guide:
| Tank | 9″ latex | 11″ latex | Best for |
|---|---|---|---|
| Small disposable | ~[30] | ~[16] | Small parties, a few bunches |
| Medium disposable | ~[50] | ~[27] | Birthdays, baby showers |
| Large / refillable cylinder | Hundreds | Hundreds | Weddings, events, business |
Foil (mylar) balloons vary widely by size: a standard 18-inch foil uses roughly the same helium as an 11-inch latex, while giant “number” and shape foils use much more.
Why balloon size and type change the count so much
A balloon’s helium use rises quickly with size. An 11-inch latex balloon holds roughly twice the helium of a 9-inch one, so a tank that fills 30 small balloons might only fill around 15 larger ones. Foil shapes and oversized number balloons can use even more. If your design mixes sizes, plan around the biggest balloons.
How to get the most balloons from your tank
- Fill to round, not tight. Overinflating wastes helium and pops balloons — stop when the balloon is round and firm.
- Watch for leaks. A poor knot or a badly seated valve quietly drains your tank. Tie promptly and check the nozzle sits properly.
- Fill on the day. Helium escapes through latex over time, so last-minute filling means less waste and better float.
- Keep a buffer. For anything important, order slightly more helium than the maths suggests, so a couple of duds don’t leave you short.
Which tank size should you buy?
- A few dozen balloons for a small party → small disposable tank.
- A birthday or baby shower → medium disposable tank.
- A wedding, large event or regular business use → refillable cylinder.
For a full walkthrough, see our guide to choosing the right helium tank.
One safety note: helium is non-toxic and non-flammable, but never inhale it — it displaces oxygen and can cause dizziness or fainting. Keep tanks away from children and heat, and use in a ventilated space.
Know your balloon count? [Shop helium tanks] and pick the size that matches your celebration.
