Home & Electrical

Balloon Arch Calculator: How Many Balloons for a Birthday Arch or Garland?

Free tool · Updated October 3, 2026 · By CouponTalk

Your result

Enter your measurements to see your result.

Quick answer

Classic balloon arches use clusters of four 11–12 inch balloons, about 16 balloons per metre. Organic garlands, the popular mixed-size look, use about 50 balloons per metre in 5, 10–12 and 18 inch sizes. A typical 4.5 m arch over a doorway needs about 72 balloons classic or about 225 organic. Buy 10–15% extra for bursts.

How to use this calculator

Measure the length of the arch along its curve, or the wall for a garland.
Pick classic or organic style.
Enter how many colours you want to mix.

Balloons per metre

Balloon count estimates (add 10–15% spare)
Style	Balloons per metre	4.5 m door arch
Classic (4-balloon clusters, 11–12")	about 16	about 72
Organic garland (5", 10–12", 18" mix)	about 50	about 225

Estimates; balloon sizes and spacing vary.

Frequently asked questions

How long is an arch over a door?

For a standard door, an arch of about 4–4.5 m covers both sides and the top.

Do I need helium?

No. Arches and garlands use air-filled balloons on a strip or frame; helium is only for floating balloons.

How early can I make it?

Air-filled latex balloons last 2–3 days indoors, away from sun and heat.

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