2 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 4 drumsticks instead of 2.
Assumes 20 adults, a full holiday table of sides, no leftovers planned.
Twenty guests is where a turkey dinner turns from cooking into logistics. Twenty adults need about ten pounds of meat, which is two birds — and two birds is genuinely better than one large one, not merely a compromise. They clear the danger zone faster, they cook more evenly, and you get four drumsticks instead of two, which matters more than you would think if there are children in the room.
The maths, step by step
1. Meat needed 20 adults × 0.5 lb = 10 lbs
2. Less 20% for a full table of sides 10 × 0.8 = 8 lbs
3. Raw weight (a whole bird is ~40% meat) 8 ÷ 0.4 = 20 lbs raw
20 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
25 lb
10 lb
2 birds, ~13 lb each
Full holiday table
20 lb
8 lb
2 birds, ~10 lb each
Full table + leftovers
26 lb
10.4 lb
2 birds, ~13 lb each
Kids under 12 eat about 0.25 lb each — half an adult portion. Swapping four of your 20 adults for four kids takes roughly 2 lbs off the raw weight.
Cooking for 20: what actually goes wrong
Stagger the two birds by about forty-five minutes so they are not both demanding the probe at the same moment, and rotate their positions halfway — the rack nearer the firebox runs hotter, and an unrotated bird on that side will finish well ahead of its twin.
How long it takes
At 275°F — the temperature worth using, because it is the one that crisps the skin — a 10 lb bird takes about 3 h 20 m on the smoker, plus a 30-minute rest. Full timeline and start times on the 10 lb at 275°F page, or use the calculator to work backwards from your own carving time.
Not exactly 20 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 20 people?
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For 20 adults with a full holiday table, buy about 20 lbs of whole turkey — 2 birds, ~10 lb each. That yields roughly 8 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 25 lbs.
What size turkey for 20 guests?
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2 birds, ~10 lb each 2 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 4 drumsticks instead of 2.
How much turkey for 20 people if I want leftovers?
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Add about 30% and buy 26 lbs instead of 20 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 20 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 20 guests need only about 12.5 lbs of breast — 2 bone-in breasts, ~6.5 lb each. You lose the drumsticks and the centrepiece, and you gain time, oven space and all white meat.