Banner Calculator — Party Banner Sizes & Quantities
Work out banner sizes and quantities needed for your party or event venue.
Count letters and spaces
How We Calculate This
This calculator estimates banner quantities based on message length and the number of display locations.
The formula
Banner length = number of characters x 15cm per character
One banner is needed per location. Letter banners consist of individual flags, typically 15cm wide each. Measure your wall width to ensure the banner fits comfortably with some space on each side.
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates. Adjust quantities based on your guests and event type.