Helium Balloons Calculator
Plan photo props, science experiments, or decorative displays by converting balloon counts to lift capacity and helium volume.
Convert pounds to grams: 1 lb ≈ 454 g.
Add 1–3 extra balloons for safety or temperature changes.
Balloon Plan
Balloons needed
20
Includes extra safety balloons
Total lift
233 g (8.2 oz)
How to Use This Calculator
Weigh your payload
Use a kitchen or luggage scale to measure the total weight of decorations, cameras, or signs you want to lift.
Pick balloon size
Standard party balloons are 9–11″. Larger 16–24″ balloons lift more but require more helium per balloon.
Add safety buffer
Temperature and altitude affect lift. Include extra balloons to account for leakage and lift loss over time.
Formula
Lift per Balloon ≈ Volume (L) × 1.022 g
Balloons Needed = Ceiling(Payload ÷ Lift) + Extra
Helium Volume = Balloons × Volume per Balloon
Example: 200 g payload, 11″ balloon volume ≈ 14 L → Lift ≈ 14.3 g. Need 14 balloons + 2 extra = 16 balloons.
Safety & Tips
Helium is lighter than air but not without risk. Use proper balloon weights, avoid power lines, and follow local regulations for launches.
- Never inhale helium; it can displace oxygen and cause injury.
- Secure balloons with tethers; do not release them outdoors (environmental hazard).
- Helium tanks can be heavy—transport and store upright.
- For outdoor displays, consider weather (heat shrinks balloons, cold reduces lift).
Frequently Asked Questions
How much does a balloon weigh?
Standard latex balloons weigh roughly 2–3 grams; add this to your payload for precise calculations.
What about hydrogen?
Hydrogen has slightly more lift but is highly flammable. Consumer use favors helium for safety.
Can I mix balloon sizes?
Yes. Calculate lift for each size separately and sum the total to cover your payload.
How long will balloons stay aloft?
Latex balloons lose helium over hours to a day. Foil (mylar) balloons can float for days. Consider this when planning displays.