Helium Needed
25.0 cu ft
Tanks
1
Float Time
8h
Total Cost
$63
Helium Required
25.0 cu ft
1 Large (28.2 cu ft) tank
Float Time
8h
Balloon Cost
$8
Total Cost
$63
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Price as of Jul 24, 2026. Product prices and availability are accurate as of the date indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Inputs
Result
50 × 0.5 cu ft = 25 cu ft. Best tank: Large (28.2 cu ft) at $55. Balloons: 50 × $0.15 = $7.50. Total: $62.50 ≈ $63.
Inputs
Result
30 × 0.5 = 15 cu ft. Best tank: Medium (14.9 cu ft) at $40. Balloons: 30 × $1.50 = $45. Total: $85.
An 11-inch latex balloon needs 0.5 cubic feet of helium. A 14-inch latex needs 0.8 cu ft, an 18-inch foil balloon 0.5 cu ft, and a 36-inch jumbo latex needs 15 cu ft. A standard small helium tank (8.9 cu ft) fills about 18 standard 11-inch latex balloons.
| Tank Size | 11" Latex | 18" Foil | 36" Jumbo |
|---|---|---|---|
| Small (8.9 cu ft) | 17 balloons | 17 balloons | 0 balloons |
| Medium (14.9 cu ft) | 29 balloons | 29 balloons | 0 balloons |
| Large (28.2 cu ft) | 56 balloons | 56 balloons | 1 balloon |
| Jumbo (55 cu ft) | 110 balloons | 110 balloons | 3 balloons |
Standard 11-inch latex balloons float 8–12 hours. Foil/mylar balloons float 3–5 days. Jumbo 36-inch latex lasts about 24 hours. Hi-Float sealant extends latex float time by 2–2.5x, giving 11-inch balloons up to 20 hours. Always inflate latex balloons the day of the event.
For 50 standard 11-inch latex balloons, you need 25 cu ft of helium — a large tank (28.2 cu ft) at about $55 rental. The most cost-effective approach is to match one large or jumbo tank rather than multiple small ones. A jumbo tank (55 cu ft) fills 110 standard balloons for about $85.
For 50 standard 11-inch latex balloons, budget $13–18 for balloons ($0.15–0.25 each) plus $55 for a large helium tank rental. Total: $68–$73. Add $5 for Hi-Float sealant if needed. Foil balloons cost $1.50–3.50 each but last much longer, making them more cost-effective for multi-day events.
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Last Updated: Jul 24, 2026
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