The count follows the ceiling area, not the number of guests. Our working rule is one 11-inch latex balloon for every 0.3 to 0.4 square metres, which gives an even cover where the balloons touch without being crushed together.
On that basis a 20 square metre room takes roughly 50 to 65 balloons, a 35 square metre hall around 90 to 115. If you want a dense carpet with no gaps, add about a third; if you want a light scatter with visible ceiling between the balloons, take about a third off.
Two other things change the picture. Ceiling height decides how the tails read, since long ribbons on a high ceiling look elegant but on a low one hang in everyone's face. And mixing 11-inch with a few 18-inch or 24-inch balloons covers the same area with fewer pieces while looking more expensive.
- Base rule: one 11-inch latex balloon per 0.3 to 0.4 square metres of ceiling
- Room of 20 square metres: roughly 50 to 65 balloons
- Dense carpet effect: add about a third to the count
- Light scatter with visible ceiling: reduce by about a third
- Mixing in 18-inch and 24-inch balloons fills faster and looks richer
Send the room dimensions and ceiling height and we will calculate the exact set for you.