The short answer: plan on about 11 balloons per foot for a full, organic balloon garland or arch made with mixed sizes. That means roughly 55 balloons for 5 feet, 110 for 10 feet and 165 for 15 feet.
That's the ratio we use in every ColorPlusAir kit, and it gives a garland thick enough that you can't see the strip behind it. Below is the full chart, the size mix that works, and how to measure your space.
Balloon arch chart by length
| Garland length | Total balloons | 10″ | 12″ | 18″ |
|---|---|---|---|---|
| 5 ft (1.5 m) | 55 | 36 | 14 | 5 |
| 10 ft (3 m) | 110 | 72 | 28 | 10 |
| 15 ft (4.5 m) | 165 | 108 | 42 | 15 |
| 20 ft (6 m) | 220 | 144 | 56 | 20 |
Add 5 to 10% extra for pops and gap-filling. If you're adding foil numbers, bows or large shapes, you can use slightly fewer latex balloons, because the foils take up space.
Why the size mix matters more than the total
Professional-looking arches use a mix of sizes. Roughly:
- About two thirds small (10″). These build the body and fill the gaps.
- About a quarter medium (12″). These add depth and volume.
- About one in ten large (18″). These are the eye-catchers that make the garland look "organic" rather than uniform.
Using only one size needs more balloons to look full, and still reads as a tube rather than a cloud.
How to measure your space
Measure the path the garland will follow, not just the width of the wall.
- Across a wall or table backdrop: measure the sweep you want. A diagonal from low left to high right across a 6 foot table is usually 7 to 8 feet.
- Over a doorway: add the height of both sides to the width. A standard door (about 7 ft tall and 3 ft wide) needs around 17 feet to go fully up and over, or 8 to 10 feet if it only runs across the top and down one side.
- Round frame or hoop: multiply the diameter by about 3. A 5 foot hoop is roughly 15 feet around, but most designs only cover half or two thirds of it.
Tip: lay a piece of string or ribbon along the path, then measure the string. It's the quickest way to get it right.
Quick guide by party setup
| Setup | Length we'd pick |
|---|---|
| Cake or dessert table | 5 ft |
| Photo backdrop wall | 10 ft |
| Doorway arch, or backdrop plus table | 15 ft |
| Two zones (entrance and backdrop) | Two kits, 10 ft each |
How much helium or air?
Organic garlands are almost always air-filled. They hang on a wall, so they don't need to float, and they last much longer than helium latex (several days indoors, compared with about half a day before helium balloons start to droop). All you need is a hand or electric pump.
Skip the maths
Every ColorPlusAir kit comes in 5, 10 or 15 foot sizes with the right number of each balloon size already counted and colour-matched, plus the strip, glue dots, hooks and a setup card. Choose your theme and length and the numbers are done for you.
Not sure which length? Go one size up. A slightly bigger garland can always be shaped into a fuller curve.
Find your kitReady to build? Follow our step-by-step guide on how to make a balloon arch at home.
WARNING: CHOKING HAZARD
Children under 8 yrs. can choke or suffocate on uninflated or broken balloons. Adult supervision required. Keep uninflated balloons from children. Discard broken balloons at once.
