Balloon Arch Calculator
A little air.
A beautiful possibility.
Turn the balloons you have into something worth celebrating. Shape your arch, find your colors, and leave with a plan you can actually build.
Less, just right, a little extra.
Compare spacing before buying more. Each option uses your dimensions and available colors.
From beautiful to buildable.
A numbered plan, a clear materials list, and one less thing to guess.
Inflate to the listed diameter. Tie two pairs, twist them into a four-balloon cluster, and attach clusters in numbered order along the frame from the left end. Use the color counts below for each cluster.
| Cluster | Colors 1 / 2 / 3 | Base diameter |
|---|
A palette for your occasion.
Three considered color stories. One click to make them your own.
How many balloons for an arch?
Thoughtful planning makes the celebration feel effortless.
Measure the centerline
Use the distance between frame centerlines as width and the floor-to-frame top as height. The tool approximates a half ellipse. For width 240 cm, height 230 cm and diameter 25 cm, the path is about 5.63 m. At 80% diameter spacing, that is 29 four-balloon clusters: 116 balloons, or 128 with a 10% spare allowance.
L ≈ π/2 × [3(a+b) − √((3a+b)(a+3b))], a = width/2, b = height.Start with what you have
Enter your actual inventory for each color. The plan uses only complete four-balloon clusters and distributes colors in proportion to stock. If stock is short, try the airy option or reduce the frame dimensions. Extra purchases include your chosen reserve; loose leftovers are shown separately.
Choose the right style
Classic uses consistent balloon sizes and rotating clusters. Organic varies visual sizes for a softer cloud effect. Crescent covers a 72% portion of the half-ellipse path for an asymmetric accent. These are planning illustrations: test a short section with your actual balloons before committing to a full build.
Installation: anchor the frame and bases according to the manufacturer’s instructions. Keep exits and walkways clear. Opening dimensions are approximate maximums; curved sides reduce usable headroom. Wind, heat, balloon deformation and support loads are not modeled. Keep uninflated and broken balloons away from young children.
A few things to know.
Is this balloon arch calculator free?
Yes. Design, inventory estimates, PNG export, materials CSV and browser printing are free and require no account.
Can I make an arch with 100 balloons?
It depends on the frame dimensions, inflated diameter and spacing. Enter 100 in your inventory and compare options; the tool will cap the plan at 25 complete clusters and show any estimated shortfall.
Does this calculate an exact organic garland?
No. The organic view is a mixed-size illustration with a base-diameter estimate. Compression, irregular fillers, frame shape and tying technique change real quantities. Allow spare balloons and test a sample.
How do I save a PDF blueprint?
Choose Print / save PDF and select Save as PDF in your browser. The print layout includes the design, material counts and numbered assembly map. PNG saves the canvas illustration; CSV saves per-cluster quantities.
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