Brisket cook time calculator
A packer runs about an hour to an hour and a half per pound at 225F, but the number that actually matters is what time you light the fire. Put in the weight and your pit temperature and you get the cook range, the stall, a wrap point, and a start-by clock that already has the rest built into it.
Local conditions
Off by default. Turning it on asks your browser where you are, or you can type a town instead. Nothing is requested until you do. Altitude then adjusts the cook time using the USDA figure; weather is described but never changes a number.
These are estimates. Cook to internal temperature, not to the clock — two cuts of identical weight can finish hours apart. USDA safe minimum for whole-muscle beef is 145F with a 3-minute rest. Brisket is taken far past this for texture.
Cooking something else? The full smoking calculator covers every cut, including chicken, turkey, chuck roast, pork loin, beef short ribs and salmon.
How it works
The rate is anchored at a 225F pit and scaled from there, so a 275F cook comes out roughly twenty percent shorter. A whole packer and a flat are not the same animal: the flat is leaner and thinner, cooks a little faster per pound, and gives up less weight, so pick the one you actually bought.
Brisket stalls, and it stalls hard. Somewhere around 150 to 170F internal the surface gives off moisture as fast as the pit adds heat and the temperature simply stops climbing, sometimes for three or four hours. That is physics, not a problem with your fire.
Wrapping ends the stall early and takes about twenty percent off the total. Foil is faster and softens the bark; butcher paper is slower and keeps it firmer. The calculator applies the reduction only when you tell it you are wrapping.
Rest is not optional on a brisket and it is not five minutes. An hour is a floor, two is better, and that time is already inside the start-by clock so you do not have to do the subtraction yourself.
What it assumes
- The brisket is trimmed and goes on cold from the fridge, onto a pit already holding temperature.
- You are cooking to texture, not to a number. The pull range of 200 to 205F is where the collagen has rendered on most briskets, but the probe should slide in like the meat is not there. If it does not, it is not done, whatever the thermometer says.
- The spread is the honest answer. Two 12 lb packers from the same case can finish three hours apart, which is why the output is a range and why the rest window is your buffer.
- Sea level, unless you tell it otherwise. Brisket stalls, so USDA's high-altitude figure does apply here: switch on local conditions and a packer in Denver picks up a visible chunk of extra time that a packer in Houston does not.
Questions
Roughly 12 to 18 hours, plus at least an hour of rest. That spread is real: the fat content, how hard the stall bites, and how often you open the lid all move it. Start early and hold it in a cooler rather than making thirty people wait.
Related guides
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