Cook Time by Weight & Protein Type
Last reviewed: April 2026
How long to cook turkey, chicken, beef, pork, ham, and lamb by weight with USDA internal temperature targets. This calculator runs entirely in your browser — your data stays private, and no account is required.
Cooking time depends primarily on weight, thickness, and starting temperature of the food, plus your oven temperature, altitude, and cooking method. This calculator adjusts cooking times when you change any of these variables — essential when scaling recipes up or down, cooking at a different temperature than the recipe specifies, or working at high altitude.
Cooking time does not scale linearly with weight. A 20-lb turkey doesn't take twice as long as a 10-lb turkey. Heat must penetrate from the surface to the center, and the relevant factor is thickness (roughly the cube root of weight). A general guideline: cooking time scales with weight to the ⅔ power. So doubling the weight increases cooking time by about 59% (2^0.67), not 100%. This is why recipe scaling isn't as simple as multiplying everything.
Higher temperatures cook faster but with different results. Low and slow (275–325°F): Best for large roasts, tough cuts (brisket, pork shoulder), and items where you want even doneness throughout. More forgiving of timing errors. Standard (350–375°F): General-purpose for most baking and roasting. High heat (400–450°F): Creates better browning and crispier exteriors but requires more attention to prevent overcooking. When changing temperature: a rough rule is that every 25°F increase reduces cooking time by about 10–15%.
Cooking times are estimates — internal temperature is the only reliable doneness indicator. Invest in an instant-read thermometer ($15–25). Key targets: Chicken/turkey: 165°F (74°C) in the thickest part. Pork: 145°F (63°C) + 3 min rest. Beef (medium-rare): 130°F (54°C). Beef (medium): 140°F (60°C). Fish: 145°F (63°C). Bread: 190–210°F (88–99°C) internal. Start checking temperature 15–20 minutes before the estimated time to avoid overcooking.
At high altitude (above 3,500 feet), lower air pressure affects cooking in important ways. Boiling point drops — water boils at ~202°F at 5,000 feet vs 212°F at sea level, so boiled foods cook more slowly. Baked goods rise faster and may collapse — reduce leavening by 25%, increase liquid by 2–4 tablespoons per cup, and increase oven temperature by 15–25°F. Roasting times increase slightly at altitude due to lower air density affecting heat transfer.
Convection ovens circulate hot air with a fan, cooking food 25% faster at the same temperature — or equivalently, you can reduce the temperature by 25°F and keep the same time. Most recipes are written for conventional ovens, so adjust accordingly. Convection is especially good for roasting (crispier skin, more even browning) and baking cookies (more uniform results across racks).
| Protein | Oven Temp (°F) | Time per lb | Safe Internal Temp |
|---|---|---|---|
| Chicken (whole) | 375°F | 20 min/lb | 165°F |
| Turkey (whole) | 325°F | 13–15 min/lb | 165°F |
| Beef roast (med-rare) | 325°F | 15–17 min/lb | 135°F |
| Pork loin | 375°F | 20 min/lb | 145°F |
| Salmon fillet | 400°F | 12–15 min total | 145°F |
Cooking time depends on four interrelated factors: the food's size and shape, its starting temperature, the cooking method's heat transfer mechanism, and the target internal temperature. Heat penetrates food from the outside in, so thicker items take disproportionately longer — doubling the thickness of a piece of meat roughly quadruples the cooking time because heat must travel twice as far and the total volume increases by a factor of eight (length × width × height). A 1-inch steak might reach medium-rare in 8 minutes of pan-searing, while a 2-inch steak of the same cut requires 25-30 minutes even at the same pan temperature. This non-linear relationship is why weight-based cooking charts exist: they translate the size variable into something easily measured.
Starting temperature significantly affects cooking time. A roast taken directly from the refrigerator (38°F/3°C) needs 15-30 minutes longer than one brought to room temperature (65°F/18°C) before cooking. Professional kitchens "temper" proteins by leaving them on the counter for 30-60 minutes before cooking to reduce the thermal gradient and promote more even cooking. Conversely, a frozen turkey placed directly in the oven requires roughly 50% more time than a fully thawed one — and the outside may overcook before the center reaches safe temperature, which is why food safety guidelines strongly recommend complete thawing before cooking poultry.
Different cooking methods transfer heat through different mechanisms, each producing distinct results and requiring different time calculations. Convection (hot air in an oven or air fryer) transfers heat relatively slowly because air is a poor conductor. Conduction (direct contact with a hot pan or griddle) transfers heat much faster at the contact surface but cannot reach areas not touching the pan. Radiation (broiling, grilling, infrared) delivers intense surface heat that creates Maillard browning and caramelization. Boiling and steaming use water's high heat capacity and thermal conductivity to transfer heat efficiently and uniformly, which is why boiled potatoes cook more evenly (though less flavorfully) than roasted potatoes of the same size.
Convection ovens circulate heated air with a fan, increasing the rate of heat transfer by 25-30% compared to conventional (still-air) ovens. This is why convection cooking reduces time by approximately 20-25% or temperature by 25°F (about 15°C) relative to conventional recipes. The moving air strips away the cool boundary layer that naturally forms around food surfaces, maintaining a steeper temperature gradient between the oven air and the food surface. Sous vide cooking represents the opposite extreme: food is sealed in bags and cooked in precisely temperature-controlled water for extended periods (often 1-72 hours), trading time for unprecedented precision — the food cannot overcook because it eventually equilibrates to the exact water temperature.
| Food | Safe Internal Temp | Rest Time | Notes |
|---|---|---|---|
| Poultry (all cuts) | 165°F / 74°C | None required | No exceptions — always 165°F |
| Ground meat (beef, pork) | 160°F / 71°C | None required | Grinding distributes bacteria throughout |
| Beef/pork steaks & roasts | 145°F / 63°C | 3 minutes | For medium-rare; bacteria only on surface |
| Fish & shellfish | 145°F / 63°C | None required | Fish should flake easily |
| Leftovers & casseroles | 165°F / 74°C | None required | Reheat thoroughly |
The distinction between whole-muscle meats and ground meats reflects how bacterial contamination works. Bacteria on a steak exist almost exclusively on the surface, so searing the exterior to well above 165°F kills them even if the interior remains rare (130°F). Grinding distributes surface bacteria throughout the meat, requiring the entire mass to reach 160°F for safety. This is why a rare steak is considered safe but a rare hamburger is not — the same pathogen (E. coli, Salmonella) poses very different risks depending on whether it remains on the surface or is mixed throughout. Cooking time calculations should always prioritize reaching safe internal temperatures, verified with an instant-read thermometer rather than relying on visual cues like color or juice clarity, which are unreliable indicators of doneness.
At higher altitudes, atmospheric pressure decreases, which lowers the boiling point of water — approximately 2°F (1°C) for every 1,000 feet (300 meters) above sea level. At 5,000 feet (Denver's elevation), water boils at about 202°F instead of 212°F. This lower maximum water temperature means boiling, steaming, and braising take longer at altitude because the cooking liquid is cooler. Pasta that takes 10 minutes at sea level may require 12-14 minutes at 5,000 feet. Pressure cookers become especially valuable at high altitude because they restore the boiling point to near-sea-level values by increasing the pressure inside the sealed vessel.
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→ A meat thermometer is the only reliable doneness indicator. Color, juices, and cooking time are unreliable. USDA safe minimums: poultry 165°F (74°C), ground meat 160°F (71°C), whole cuts of beef/pork/lamb 145°F (63°C) with 3-minute rest. Insert the probe into the thickest part, away from bone.
→ Let meat rest after cooking. Resting allows juices to redistribute and carryover cooking to finish the job. Large roasts rise 5–10°F during rest. Pull beef roasts at 5°F below target and let rest 15–20 minutes. Turkey rests 30–45 minutes without significant temperature loss.
→ Room-temperature meat cooks more evenly. Remove meat from the refrigerator 30–60 minutes before cooking (15 minutes for thin cuts). Cold meat hitting a hot oven produces overcooked edges and undercooked centers. This is especially important for thick steaks and roasts.
→ Bone-in takes longer than boneless. Bone insulates surrounding meat, adding 5–10 minutes per pound for large roasts. However, bone also conducts heat once heated, so the effect is smaller than many recipes suggest. Always use temperature, not time, as your final check. See our Temperature Converter for °F/°C conversions.
See also: Air Fryer Converter · Temperature Converter · Recipe Scaler · Cooking Converter