Plan an organic balloon garland or a classic arch without running short. Enter the length (or the arch height and width), how full you want it and your colors to get the number of 5, 11 and 18 inch balloons for each color, bags to buy and how long inflating and building will take.
Last updated:
Garland or arch
Style
Floor to the top of the arch.
Distance between the two feet.
Percent of 5 in / 11 in / 18 in balloons.
Colors
Separate with commas. Up to 8 colors.
Leave blank to split equally.
%
Inflating
Enter your values to see the result.
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How to use the Balloon Garland Calculator
Choose organic or classic and enter the garland length, or switch to arch height and width.
Pick the fullness and size mix. Standard fullness suits most backdrops; choose extra full for photo walls and arches.
Type your colors separated by commas and, if you want, a percentage split such as 50, 30, 20.
Set spares, fill and inflator to get the helium or strip length and a build time estimate.
Copy or download the color table as your shopping list.
Balloon garland rules of thumb
An organic garland is made of balloons in several sizes packed tightly together, so the count depends on the length and how full you want it to look:
Balloons = length in feet × balloons per foot × (1 + spare %)
Length
Light (11 / ft)
Standard (16 / ft)
Extra full (22 / ft)
Classic arch (5 / ft)
6 ft (table runner)
66
96
132
30
10 ft
110
160
220
50
12 ft (backdrop)
132
192
264
60
16 ft
176
256
352
80
20 ft (arch)
220
320
440
100
Counts before spares. A typical standard garland is about 35% 5 inch, 55% 11 inch and 10% 18 inch balloons; 5 inch balloons are cheap filler, while 18 inch balloons add big, eye-catching volume.
Arch length from height and width
For a round-topped arch the length is two straight legs plus a half circle: L = 2 × (H − W ÷ 2) + π × W ÷ 2. A 7 ft high, 6 ft wide arch is 2 × 4 + 3.14 × 3 ≈ 17.4 ft. If the arch is lower than half its width, the calculator uses a half-ellipse instead. Add a little extra if the garland will sit on the floor or curve onto a table.
Tips for building a garland
Size your balloons with a sizer box or cardboard template so every 11 inch balloon comes out the same; under-inflating slightly (to about 10 inches) makes latex more durable.
Make "doubles" and "quads": tie two balloons together, then twist two pairs into a cluster of four and thread clusters onto a decorating strip.
Add 5 inch balloons last with glue dots to fill gaps, and place 18 inch balloons at intervals for rhythm.
Keep it out of direct sun and heat, which pops and oxidizes latex. Indoors, an air-filled garland lasts several days.
For an organic (mixed-size) garland a common rule is about 15 to 16 balloons per foot for a standard look, about 10 to 12 for a light, airy garland and 20 or more for a very full, lush one. Most of them are 11 inch balloons, with 5 inch balloons for filling gaps and a few 18 inch balloons for volume.
How many balloons for a balloon arch?
First find the arch length. For a round-topped arch it is about 2 × (height − half the width) + π × half the width, so a 7 ft high, 6 ft wide arch is about 17.4 ft long. At 16 balloons per foot that is about 280 balloons, or about 300 with spares.
How many balloons for a classic balloon arch?
A classic spiral arch uses clusters of four 11 inch balloons inflated to about 10 inches. Plan about 1.25 clusters, or 5 balloons, per foot, so a 20 ft arch needs about 25 clusters and 100 balloons, plus spares.
How many spare balloons should I buy?
Buy about 10% extra. Some balloons pop while inflating, some have weak spots, and darker colors and metallics are more fragile. For outdoor events in sun or heat, buy 15% to 20% extra.
Should a balloon garland be filled with air or helium?
Most garlands and arches are filled with air and attached to a decorating strip, fishing line or a frame, which makes them last for days. Helium is only needed for floating balloons; untreated 11 inch latex balloons usually float for about 8 to 24 hours. Plan about 0.5 cubic feet of helium per 11 inch balloon.
How long does it take to make a balloon garland?
With an electric inflator, a first-timer usually needs 2 to 3 hours for a 12 ft standard garland, including inflating, tying and assembling. A second person roughly halves the time. Hand pumps take about two to three times longer to inflate.
How do I split balloons between colors?
Type your colors and a percentage for each, for example 50, 30, 20 for a main color, a second color and an accent. The calculator splits every balloon size by those shares and rounds each count up so you never run short of a color.
Are all the tools on FreeToolCabin tested for quality and accuracy?
Yes! Every tool on our site undergoes automated Q/A testing in real browser environments to ensure high precision, correct output, and zero errors. If you happen to spot a bug or have a suggestion, please contact us at [email protected] and our team will review it right away.