Get an accurate count for any room size
This is a free tool that shows you exactly how many balloons you need to fill a room. Just type in your room size, pick a balloon size, and choose how full you want the space to be. You get an accurate number in seconds, ready for your party or event.
Round balloons never fit together perfectly, they always leave small gaps between each other. That's why this calculator uses a realistic 64% packing efficiency instead of just measuring raw volume, so the number you see is close to what you'll actually need to buy. It works with air or helium, feet or meters, and any balloon size from 5" to 36", including custom sizes.
Enter your room's length, width and height, then pick a balloon size. Choose Full Room if you want balloons filling the space from the floor, or Ceiling Layer if you're using helium and want them floating near the ceiling. Then pick a fill depth, from a single layer to a completely full room, or drag the slider for a custom depth. Your result appears right away.
Calculated for 11" standard latex balloons with 64% packing efficiency
| Look | Fill depth | Balloons needed |
|---|---|---|
| 1 layer on floor | ~1 ft | ~220 balloons |
| Knee-deep (party look) | ~2–2.5 ft | ~460–550 balloons |
| Half room (wow effect) | ~4 ft | ~915 balloons |
| Full room | 8 ft | ~1,830 balloons |
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