3 smaller birds beat one giant every time at smoker temps: they clear the 40–140°F danger zone faster, cook more evenly, and give you 6 drumsticks instead of 2.
Assumes 40 adults, a full holiday table of sides, no leftovers planned.
Forty people is catering, whether or not anyone calls it that. Forty adults need about twenty pounds of servable meat, which is four birds — and at four birds the arithmetic stops being the hard part. Sourcing four turkeys of similar size on the same day, finding somewhere to thaw them all, and getting them cooked in one morning are each larger problems than the portion maths.
The maths, step by step
1. Meat needed 40 adults × 0.5 lb = 20 lbs
2. Less 20% for a full table of sides 20 × 0.8 = 16 lbs
3. Raw weight (a whole bird is ~40% meat) 16 ÷ 0.4 = 40 lbs raw
40 guests, three ways
Sides move this number more than anything else, and leftovers are a deliberate choice rather than an accident.
Scenario
Raw turkey
Meat
What to buy
Few sides, no leftovers
50 lb
20 lb
4 birds, ~13 lb each
Full holiday table
40 lb
16 lb
3 birds, ~14 lb each
Full table + leftovers
52 lb
20.8 lb
4 birds, ~13 lb each
Kids under 12 eat about 0.25 lb each — half an adult portion. Swapping four of your 40 adults for four kids takes roughly 2 lbs off the raw weight.
Cooking for 40: what actually goes wrong
Order ahead. Four birds of matched weight is a special request at most butchers in November, and thawing four turkeys needs refrigerator space most homes do not have — figure a day of fridge thawing for every four pounds. Consider bone-in breasts for part of the count: they thaw faster, cook faster, and skew the mix toward the meat people actually queue for.
How long it takes
At 275°F — the temperature worth using, because it is the one that crisps the skin — a 14 lb bird takes about 4 h 40 m on the smoker, plus a 30-minute rest. Full timeline and start times on the 14 lb at 275°F page, or use the calculator to work backwards from your own carving time.
Not exactly 40 guests?
Adjust the headcount, add kids, switch to a bone-in breast, or plan for leftovers — every number updates as you type.
Smoked turkey portion calculator
Common questions
How much turkey do I need for 40 people?
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For 40 adults with a full holiday table, buy about 40 lbs of whole turkey — 3 birds, ~14 lb each. That yields roughly 16 lbs of servable meat, because a whole bird is only about 40% meat once bone, skin and carcass are removed. With only a couple of sides, go up to 50 lbs.
What size turkey for 40 guests?
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3 birds, ~14 lb each 3 smaller birds beat one giant every time at smoker temps: they clear the 40–140°F danger zone faster, cook more evenly, and give you 6 drumsticks instead of 2.
How much turkey for 40 people if I want leftovers?
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Add about 30% and buy 52 lbs instead of 40 lbs. Turkey leftovers are the one holiday leftover people genuinely plan for, so this is rarely wasted.
Could I smoke bone-in breasts instead for 40 people?
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Yes, and it is often the smarter buy. A bone-in breast is about 65% meat against a whole bird's 40%, so 40 guests need only about 25 lbs of breast — 4 bone-in breasts, ~6.5 lb each. You lose the drumsticks and the centrepiece, and you gain time, oven space and all white meat.