How many balloons for a standard arch?

A standard doorway arch (about 2.5m wide) needs roughly 100-150 balloons depending on how full you want it. Use a mix of sizes — large, medium, and small — for a professional organic look.

How long does a balloon arch take to make?

Allow 1-2 hours for a simple arch and 3-4 hours for a large organic arch. Using a balloon strip (arch tape) speeds things up considerably. Inflate balloons in advance and store in bin bags.

What do I need to make a balloon arch?

You need balloons in multiple sizes, balloon arch strip tape, a hand pump or electric inflator, fishing line or string, and something to anchor the ends (balloon weights, sandbags, or hooks). Glue dots help attach smaller balloons.

Will a balloon arch last outdoors?

Latex balloons pop faster in direct sunlight and heat. A well-made arch lasts 2-3 days indoors or 6-12 hours outdoors in warm weather. For outdoor events, build the arch as close to the event time as possible.

PartyCalcs

Balloon Arch Calculator — Balloons for an Arch or Garland

Estimate how many balloons you need for a balloon arch, garland, or column display.

Arch Width

Arch Height

Leave 0 for garlands

Arch Type

Price per Balloon (optional)

Include 20% spare balloons

Extra for popping and replacements

How We Calculate This

This calculator estimates balloon quantities based on arch dimensions and type.

The formula

Total balloons = arch length x 6 cluster points per metre x 4 balloons per cluster

Arch length is calculated from width and height based on the arch type. Balloons are split into 3 sizes: 15% large (40cm), 60% medium (28cm), and 25% small (13cm) for an organic look. A 20% spare allowance is recommended as arches need many balloons and popping is common.

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Adjust quantities based on your guests and event type.