Free Online Balloon Calculator

Mix multiple sizes — typically 5, 11, and 18-inch — to create a luxe, layered look.

Use our free online balloon calculator to estimate how many balloons and helium you need for arches, garlands, and bouquets.

Balloon & Helium Calculator For Decorators

Estimate balloons, helium volume, materials, and build time for arches, garlands, bouquets, or ceiling fills.

Decoration Type

Size Mix

Length (ft)

Density / Look

Balloon Type

Add Helium?

Currency

11" Latex Bags 5" Latex Bags 18" Balloons 24" Accents

Quick links to wholesale bags & accents.

Total Balloons

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Helium (if used)

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ft³ | L • tank: —

Estimated Materials

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Estimated Build Time

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includes setup only

Bags to Buy

Estimates are indicative. Final pricing varies by design, delivery window, venue access & add-ons.

How many balloons do I need for an arch?

For a full look, use about 5–6 balloons per linear foot of arch. For a lighter look, plan around 3–4 per foot.

How much helium do I need?

An 11-inch latex balloon requires roughly 0.5 cubic feet (14 L) of helium. Multiply by your total balloon count for an estimate.

What’s the best balloon size for garlands?

Mix multiple sizes — typically 5", 11", and 18" — to create a luxe, layered look.

Can I DIY, or should I book setup?

DIY is fine for small builds. For large arches or premium installs, booking our team ensures symmetry and long-lasting results.