BalloonBuilder.com
Designed by balloon pros, for balloon pros
Calculate how many balloons you can fill from any helium tank. Free helium calculator with balloon helium volume, accurate inflation calculations, and helium/air mix support.
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⚠ Volume note: Balloon volumes depend on the manufacturer — dimensions vary between brands, and the reported size (e.g. 12") may not always match the actual inflated diameter. Values shown are based on Sempertex (latex) and Grabo (foil) specifications.
⚠ Float time note: Float times are estimates and vary depending on balloon manufacturer, material weight, temperature, and altitude. For longer float times with latex balloons, consider using Hi-Float or similar balloon treatment products.
⚠ Party tank note: Disposable party tanks from some manufacturers may contain helium that is less than 100% pure (80% purity is common), which can reduce float time compared to professional-grade cylinders.
Always order 10–15% more helium than calculated to account for gas loss and inflation variations.
Use this free helium balloon calculator to find out exactly how many balloons you can fill from any helium tank. Whether you're using a small disposable party cylinder or a professional 50-liter refillable tank, this helium calculator gives you accurate balloon helium counts based on manufacturer data from Sempertex and Grabo.
The helium volume calculator supports latex balloons (5" to 36" / 90 cm), foil balloons (18" and 36" rounds, hearts, and stars), number balloons (26" and 40" with individual digit volumes), letter balloons, and Globe/Orbz balloons. You can also enter a custom balloon diameter up to 240 cm for specialty sizes.
Save money by using this helium balloon inflation calculator to calculate your exact helium needs before your event. Mix helium with air (60/40 or 80/20) to stretch your tank further — the calculator shows you exactly how many more balloons you'll get with each mix ratio.
Use this helium tank calculator to find the right tank size for your event. In Europe, disposable party tanks are labeled by approximate balloon count ("20", "30", "50" balloons). Professional decorators typically use refillable cylinders from 10L to 50L at 200 bar pressure. A standard 20-liter tank holds 4,000 liters of helium volume — enough for approximately 250 standard 12" latex balloons.
In the United States, tanks are measured in cubic feet. Common sizes include disposable party tanks and rental cylinders from 20 to 291 cubic feet. This helium calculator lets you compare tank sizes and calculate the exact balloon helium count for each — helping you find the most cost-effective option for your balloon inflation needs.
Professional balloon decorators often use a helium/air mix to reduce costs while keeping balloons airborne. This helium balloon inflation calculator lets you see exactly how different mix ratios affect your balloon helium count. A popular 60% helium / 40% air mix lets you fill 67% more balloons from the same tank, though float time is reduced to about half. This is ideal for same-day events and indoor installations where maximum float time isn't critical.
At 50% helium, standard 11"–12" latex balloons will barely float. Below 40% helium, most latex balloons will not stay airborne. Foil balloons are lighter and can float at lower helium percentages. Use this free helium calculator to experiment with different mix ratios and find the optimal balance between cost and float time for your event.
This free helium balloon calculator tells you how much helium you need — but BalloonBuilder lets you design the actual decorations. Create stunning balloon arches, columns, walls, and backdrops with full 3D visualization, custom colors, and professional exports.
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