๐ Helium Balloons Calculator
Estimate how many balloons you need to lift a given weight. Real-time, unit-aware, PDF-ready.
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Live result
You needโฆ
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Number of balloons (minimum to just lift off)
Quick summary
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Step-by-step derivation
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Reference table & sources
| Gas | Density (g/L) | Assumed air (g/L) | Net lift per liter (g/L) | Notes |
|---|
Assumptions: air density โ 1.25 g/L (sea-level), spherical balloons. Gas densities (typical, STP): Helium 0.1785; Hydrogen 0.0899; Ammonia 0.769; Methane 0.656โ0.716 g/L.
Sources: air density (Wikipedia), helium/hydrogen (standard data), methane/ammonia (engineering/wikipedia). Always allow margin in real life.