Below roughly 150 guests, most corporate party menus scale linearly - double the guest count, double the quantities, adjust staffing accordingly. Past that point, service style and room logistics start driving decisions more than simple per-person math, because a single buffet line or plated service model starts to break down under the guest count.
A single buffet line that works fine for 80 guests becomes a bottleneck at 150+ - the fix isn't a longer line, it's multiple identical stations positioned around the room so guests aren't funneling through one point. This changes your equipment needs (duplicate chafing setups) and your staffing (each station needs its own attendant).
Plated dinners for 150+ guests need a kitchen and staffing setup that can turn multiple courses within a tight window across that many covers - it's not impossible, but it's a meaningfully bigger operational lift than the same service style at 80 guests, and worth pricing accordingly rather than treating it as a simple per-person scale-up.
At this guest count, a cocktail-style event with passed apps and a few stationary displays often works better than either buffet or plated - it distributes the crowd naturally around the room instead of funneling everyone toward one or two service points.
Even at this scale, the core per-person quantities for food don't change - what changes is how you deliver it. Run your base quantities the same way you would for any guest count, then layer the station/staffing/logistics decisions on top once you know the real number.
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