Estimate roasting time for chicken, turkey, beef, pork, or ham based on weight and a standard oven temperature.
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Oven roasting times are traditionally estimated using a simple rate: a certain number of minutes per kilogram (or pound) of food, plus a fixed base amount of extra time to account for heat reaching the center of a larger cut. This calculator uses commonly published estimates for whole chicken, turkey, beef and pork roasts, and reheating a fully cooked ham, at standard oven temperatures widely recommended for each type of dish. These figures are a planning estimate only, meant to help you schedule a meal — actual cooking time depends on your particular oven's true internal temperature, whether the meat was chilled or closer to room temperature before it went in, and the exact shape and bone content of the cut. Because undercooked poultry and meat carry a genuine food-safety risk, always verify doneness using a meat thermometer inserted into the thickest part of the cut, rather than relying on the clock alone to decide when a roast is finished.
Timing a roast well is part science and part experience, which is exactly why most cooking guides fall back on a simple rule of thumb: a certain number of minutes per kilogram, plus a bit of extra time regardless of size. This calculator applies that same logic across five common oven dishes, so you can get a reasonable starting estimate before you even preheat the oven.
The "minutes per kilogram plus a base amount" approach works because larger cuts do not cook in perfect linear proportion to their weight — heat has to penetrate to the center, and a very large roast doesn't need twice the time of one half its size, but it does need noticeably more than a purely proportional rate would suggest. The fixed base minutes in this calculator account for that extra time needed to get the outer layers up to temperature before the center catches up.
Each food type here uses a different rate because different meats cook, and are considered safely done, in different ways. Whole poultry needs to reach a higher internal temperature throughout because of how bacteria can be distributed in raw poultry, while a beef roast served medium-rare only needs to reach a lower internal temperature at its center. A reheated, fully cooked ham needs the least additional cooking of all, since the food-safety concern is simply bringing it back up to a safe serving temperature rather than cooking raw meat through.
No time-based formula can account for everything that affects an individual roast — oven calibration varies from unit to unit, a bone-in cut behaves differently from boneless, and a chilled roast straight from the refrigerator takes longer than one brought closer to room temperature first. That's why this calculator is best used as a starting point for planning your schedule, with the final word always coming from a meat thermometer checking the internal temperature shown in the note above your result.
Each food type here is paired with a standard, widely recommended roasting temperature so the minutes-per-kilogram rate stays accurate; changing the oven temperature significantly would change the correct rate too.
No — stuffing adds significant extra cooking time and this calculator assumes an unstuffed bird; a stuffed turkey needs both the meat and the stuffing center to reach a safe temperature.
No — oven performance and cut shape vary enough that time alone isn't a reliable safety check; always confirm with a meat thermometer at the thickest part.
No, the result is oven time only; beef and pork in particular benefit from a few extra minutes of resting time off the heat before serving, which isn't included here.