Mazel tov! Between the service, the party, and everything in between, food planning for a Bar or Bat Mitzvah can sneak up on you - mostly because "Bar/Bat Mitzvah reception" can mean two pretty different events depending on when and how you're hosting. Figuring out which one you're actually planning is the first step.
A kiddush luncheon happens right after the Saturday morning service, runs a couple of hours, and is typically lighter - often dairy or pareve, with a spread of salads, bagels and spreads, quiche, and pastries rather than a full hot meal. An evening reception is a different animal: a longer event, often with a seated or buffet dinner, a full bar, and dessert - closer to a wedding reception in scope. If you're not sure which category your event falls into, it usually comes down to timing: daytime and right after services means luncheon math; evening with a DJ and dancing means dinner math.
Kiddush luncheon: Light fare per person - budget roughly 4-6oz of food total across salads, spreads, and pastries, for a 1-2 hour event
Evening reception: Full meal per person - budget closer to a normal dinner (6-8oz main, sides, dessert) for a 3-4 hour event
Bar and Bat Mitzvah guest lists usually include a lot of the kid's classmates and friends, which means more kids and teens on the list than a typical adult event. Kids generally eat smaller portions than adults - figure on roughly half a portion for younger kids - but if there's a kid-friendly spread (chicken fingers, pizza, a candy or dessert bar), teens especially tend to gravitate toward it and eat more there than they would at the adult buffet. Worth planning a bit extra on those kid-favorite items specifically.
Many families keep a kosher-style spread for these events, and a Saturday kiddush luncheon in particular is often dairy or pareve rather than meat, since it follows right after a morning service. If dietary rules matter for your event, sort that out before you get too deep into quantities - it can shift which dishes you're even choosing from, not just how much of them to buy.
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