For a general mixed-gender adult audience in the US, the typical distribution is approximately: XS 4%, S 18%, M 30%, L 26%, XL 14%, XXL 6%, and 3XL 2%. However, this varies by event type. Athletic events skew towards smaller sizes, while corporate conferences often need more L–XXL. Use our preset templates above to match your audience profile.

We recommend 5–10% buffer stock. This accounts for last-minute registrations, size exchanges, damaged shirts, and volunteers/staff who may need shirts. For small events (<50 people), consider a higher buffer of 10–15% since a single size swap has a bigger proportional impact. For large events (500+), 3–5% is usually sufficient due to the law of averages.

Guessing leads to costly mistakes—either running out of popular sizes (M, L) or being stuck with dozens of unworn XS or 3XL shirts. A data-driven distribution ensures you order the right quantity per size, minimizing waste and keeping attendees happy. Event planners who use distribution-based calculators report 30–40% less surplus inventory.

The most accurate method is to include a size selection field in your registration form (Eventbrite, Google Forms, Typeform, etc.). Ask for unisex sizes if you're ordering one style. If you have the data, you can override our preset percentages with your actual collected distribution. For events without pre-registration, use our demographic-based presets.

If your event includes children or offers women's fitted cuts, we recommend calculating those categories separately. For youth events, use our "Family/Community" preset which skews toward smaller sizes, or manually adjust the percentages. For women's cuts, note that a women's M typically corresponds to a unisex XS/S, so factor in a shift of about one size down when mixing styles.

Many print shops sell shirts in dozens (multiples of 12). Our calculator already rounds up to the nearest whole number for each size. If your supplier requires dozen-based ordering, take the calculated quantity and round up to the next multiple of 12 manually. The buffer stock often covers the rounding gap naturally.

Always have a contingency plan. Keep a small reserve of the most popular sizes (M, L, XL) behind the distribution table for exchanges. If someone needs a size that's out of stock, offer to mail it post-event or provide a discount code for your online store. Using an adequate buffer (5–10%) dramatically reduces the chance of running out.

Size distributions vary significantly by region. European audiences tend toward slimmer fits (shift distribution down one size). Asian audiences typically need smaller sizes on average—consider adding XS and reducing XL+. For international events, if possible, collect size data during registration or consult local apparel suppliers for regional norms.