๐ Party & Events
Balloon Arch Calculator
An arch is a half ellipse, so its garland is longer than the width you see โ the curve adds length at the top. Because balloons are clustered rather than laid end to end, roughly 15 per cent of the garland length is overlap, which is what stops gaps appearing when the arch is assembled.
How it works
Arch width
Arch height
Balloon size
Garland style
Garland length
Balloons needed
Clusters of four
Balloons to buy (with 10% spares)
Total arch span
Frequently asked questions
How do I use the Balloon Arch Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.