Confirmed flat and inflated heights
16 inches flat → approximately 30 cm inflated. 18 inches flat → approximately 35 cm inflated. 32 inches flat → approximately 60 cm inflated.
36 inches flat → approximately 70 cm inflated. 38 inches flat → approximately 80 cm inflated. 40 inches flat → approximately 85 cm inflated.
Why an inch-to-centimetre conversion is not the inflated size
Converting a flat measurement from inches to centimetres only changes the unit. It does not calculate the finished balloon dimensions. During inflation the flat panels form a three-dimensional shape, so the measured flat height and the finished display height are different quantities.
Use the right dimension for the question
Use the measured flat height to identify the listed size. Use the approximate inflated height to plan a display. These values are heights, not diameters or widths. Do not describe a 40 inch flat balloon as 40 inches tall after inflation.
Keep the limits of the size data visible
The confirmed inflated heights are approximate. Flat widths, inflated widths and numerical dimensional tolerances remain 【待确认】. Do not infer these missing values from a photograph or convert them from the height.
Clarify dimensions shown on customer images
Before purchasing, establish whether a dimension on a photograph refers to the flat balloon or the inflated balloon. Inflation changes the three-dimensional form; a flat height cannot be used as the finished display height. The confirmed size table above is unchanged.
Frequently asked questions
What does 40 inches mean for this range?
It is the measured flat height before inflation. The corresponding inflated height is approximately 85 cm.
Is the 18 inch model 18 inches tall after inflation?
No. Its measured flat height is 18 inches and its approximate inflated height is 35 cm.
Are these dimensions confirmed for every UNDALO balloon family?
No. These pairs are confirmed for the multicolor number-balloon range; other families need their own specifications.