Buying the right size turkey comes down to one simple ratio: pounds per guest. This calculator applies the standard 1-1.5 lb bone-in allowance per person, with an adjustable leftovers preference, so you can walk into the store knowing exactly what weight to look for.
How the Turkey Size Calculator works
The calculator multiplies your guest count by a fixed pounds-per-person figure: 1.25 lb/person if you just want enough to serve everyone once, or 1.5 lb/person if you want leftovers. Both figures come from the widely published 1-1.5 lb bone-in rule of thumb used by USDA food-safety guidance and most poultry producers. Because the formula is a straight multiplication, the recommendation scales smoothly from a small dinner to a large holiday gathering.
Inputs and what they mean
Guest count is simply the number of people you're feeding — there's no strict rule on whether to count children as full guests, so adjust the number up or down based on your own gathering. The leftovers toggle switches between the two standard per-person allowances; choose "Yes" if you want enough for next-day sandwiches, soup, or a second meal from the same bird.
Limits and edge cases
This calculator assumes a whole, bone-in turkey — if you're buying a boneless turkey breast or roast instead, use a lower allowance (roughly 0.5-0.75 lb per person) since there's no bone or carcass weight to account for. It also doesn't account for very large groups needing more oven capacity than a single bird provides; for 20+ guests, many cooks find that two smaller turkeys cook more evenly and free up oven space compared to one very large bird. Finally, grocery stores typically stock whole turkeys in common sizes (roughly 10-24 lb) — round your recommended weight up to the nearest size actually available.