Balloon Arch Instructions -
Length and Height Formula
The first thing you need from our balloon arch instructions is the formula for calculating the required length of line, as this determines the number of balloons you'll need for your arch.
To figure out the size of the balloon arch you want to build, you need to measure the height and width of the area where it will be displayed. Use the following calculations to work out the approximate length of your arch line.
Fig. 1
To make an arch that's wider than it is tall:
width + height = approximate total length.
Fig. 2
For an arch that has the same height and width:
(1.5 x height) + width = approximate total length.
Fig. 3
For an arch that's taller than it is wide:
(2 x height) + width = approximate total length.
For a 'String of Pearls' arch you'll need about three 11" balloons per meter.
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