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Cooking Time Calculator: Calculate Roast Cooking Time by Weight

Calculate roasting time per pound for meats and poultry

EverydayBy Numora teamReviewed by Numora Culinary TeamUpdated 

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Assumptions
lb
Total cooking time
80

Conventional oven baseline

Hours1
Minutes20
Target internal temp165

Cooking times are estimates. Always use a meat thermometer to verify the internal temperature in the thickest part of the meat. USDA safe minimum internal temperatures: poultry 165°F, ground meat 160°F, whole cuts beef/pork/lamb 145°F (with 3-minute rest).

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⚡ The answer

A cooking time calculator estimates how long to roast a piece of meat based on weight, type, and oven temperature. The time-per-pound rule of thumb varies: ~20 min/lb for whole chicken at 350°F, ~13 min/lb for turkey at 325°F, ~22 min/lb for medium beef. Always finish with a meat thermometer to confirm USDA-recommended internal temperature.

Quick takeaway

This cooking time calculator helps you estimate how long to roast various meats and poultry, including whole chicken, turkey, beef roasts, pork loin, and lamb leg. It factors in the meat's weight, your chosen oven temperature, and the desired doneness, providing an estimated total cooking time in minutes. Crucially, it also gives you the USDA-recommended safe minimum internal temperature for each meat type. Always use an instant-read meat thermometer to verify the internal temperature in the thickest part of the meat, as actual cooking times can vary due to oven calibration, meat's starting temperature, and whether it's bone-in or boneless. Remember to account for carryover cooking and allow the meat to rest for optimal juiciness.

What is a cooking time?

Use this cooking time calculator to estimate roasting time for whole birds (chicken, turkey), beef roasts, pork loin, and lamb leg based on weight, oven temperature, and target doneness. Time-per-pound guidelines are calibrated against America's Test Kitchen technique references and validated USDA food-safety internal temperature targets. Always confirm doneness with an instant-read meat thermometer in the thickest part — time-based estimates account for typical oven calibration but not your specific oven, the meat's starting temperature, or whether the cut is bone-in or boneless.

The formula

Cooking time = weight × min/lb × oven adjustment
  • w — weight in pounds
  • r — minutes per pound (varies by meat type)
  • a — oven temperature adjustment (1.0 at 350°F, lower at higher temps)

Source: USDA Food Safety and Inspection Service safe minimum internal temperatures.

Worked examples

14 lb whole chicken at 350°F

Inputs
meat: chickenweight: 4ovenTemp: 350
Walkthrough

20 min/lb × 4 lb × 1.0 (350°F) = 80 minutes. Pull when thigh meat reaches 165°F (USDA poultry minimum). Let rest 10 minutes before carving — internal temp will rise 5°F during rest, so pulling at 160°F often works in practice.

212 lb turkey at 325°F (Thanksgiving)

Inputs
meat: turkeyweight: 12ovenTemp: 325
Walkthrough

13 min/lb × 12 lb × 1.15 (325°F adjustment) ≈ 180 minutes = 3 hours. Pull when breast reaches 165°F. If stuffed, add 30+ minutes — and confirm the stuffing also reaches 165°F.

35 lb medium beef roast at 350°F

Inputs
meat: beefMediumweight: 5ovenTemp: 350
Walkthrough

22 min/lb × 5 lb × 1.0 = 110 minutes. Pull at 140°F internal — temperature will rise to 145°F during a 10-minute rest. The classic 'medium' interior is pink in the center and gray at the edges.

How to use this calculator

  1. Meat type (default: chicken)
  2. Weight — Weight in pounds. 1 lb = 0.4536 kg.
  3. Oven temperature (default: 350)
  4. Read the result. Use the worked examples below to sanity-check against a known scenario.

What your result means and what to do next

If above
If cooking time is significantly longer than estimated, your oven might be running cool, or the meat started colder. If internal temperature is above target, the meat will be drier and tougher.
If below
If cooking time is significantly shorter, your oven might be running hot, or the meat was smaller/thinner than expected. If internal temperature is below the USDA minimum, the meat is unsafe to eat and requires further cooking.
When to escalate
If the meat's internal temperature does not reach the USDA minimums (165°F for poultry, 145°F for whole cuts of beef/pork/lamb, 160°F for ground meat), continue cooking. If you suspect your meat thermometer is faulty, verify it in boiling water (212°F/100°C) or ice water (32°F/0°C).
Common misreading
Relying solely on visual cues (color, juices running clear) for doneness. These are unreliable; a meat thermometer is the only accurate way to confirm safe internal temperatures. Also, forgetting about carryover cooking and resting can lead to overcooked or dry meat.

Time-per-pound at 350°F oven temperature

MeatMin/lbInternal temp
Whole chicken20165°F
Whole turkey13165°F
Beef roast (rare)18130°F
Beef roast (medium)22145°F
Beef roast (well)28160°F
Pork loin25145°F
Lamb leg22145°F

Lower oven temps add ~15%; higher temps subtract 10–25%.

Frequently asked questions

How long does it take to roast a chicken?
About 20 minutes per pound at 350°F. So a 4-lb chicken takes ~80 minutes; a 5-lb takes ~100 minutes. Always confirm with a thermometer at 165°F in the thickest part of the thigh.
How long to cook a turkey?
13 minutes per pound at 325°F for an unstuffed bird. A 12-lb turkey takes about 3 hours; a 16-lb takes about 4 hours. Add 30+ minutes if stuffed, and verify stuffing reaches 165°F.
What's the safe internal temperature for chicken?
165°F (74°C) per USDA. This applies to all parts — breast, thigh, wing, ground. Below 165°F, salmonella and other pathogens may survive; the temperature must be reached at the thickest point.
Can I cook beef to less than 145°F?
USDA minimum is 145°F with a 3-minute rest. Many home cooks and restaurants pull whole-cut beef earlier (130°F for rare, 135°F for medium-rare) for texture. The pathogen risk on whole-muscle cuts is on the surface, which sears at the higher pan temperature; ground beef must reach 160°F because pathogens get distributed throughout.
What temperature should pork be?
USDA recommends 145°F for whole cuts (with a 3-minute rest), updated from the older 160°F guidance. Modern pork is much leaner and trichinosis is rare. Ground pork still needs 160°F.
Why does carryover cooking matter?
Internal temperature continues to rise 5–10°F after you pull the meat from the oven, as heat conducts inward from the hotter exterior. Pull at 5°F below your target to land at the right temperature after a 10–15 minute rest.
Should I cover the meat while it rests?
Tent loosely with foil if the room is cool — keeps the surface from over-cooling. Don't seal tightly; trapped steam will soften the crisp exterior. 10–15 minutes is plenty for most roasts; a whole turkey can rest 30+ minutes.
Does opening the oven extend cooking time?
Yes — meaningfully. Each peek drops the oven temperature 25–50°F, which can take 5+ minutes to recover. Use the oven light and window when possible; only open to baste or check the thermometer reading.

Cooking Time glossary

Internal temperature
Temperature at the geometric center (or thickest part) of cooked meat, measured with an instant-read thermometer. The single most reliable doneness indicator.
Carryover cooking
Continued cooking after the meat is removed from the oven. Internal temperature typically rises 5–10°F during a 10–15 minute rest, so most cooks pull below the target temperature.
Resting
Letting cooked meat sit before slicing so juices redistribute. Skipping the rest causes juices to flood the cutting board, leaving the meat dry.
USDA minimum
The internal temperature at which pathogens are killed. Poultry 165°F, ground 160°F, whole cuts 145°F + 3-min rest. Some chefs pull below for rare/medium-rare beef accepting a small added risk.
Doneness
The level of cookedness, ranging from rare (130°F) to well done (160°F+) for beef. Different meats have different optimal pulls — pork is best at 145°F; chicken always at 165°F.

How we built this calculator

Methodology

Cooking time scales linearly with weight at the same oven temperature. The time-per-pound multiplier varies by meat type, which depends on density, fat content, and target internal temperature. Higher oven temperatures shorten the time roughly proportionally — a 425°F roast typically takes 70–80% of the time the same meat needs at 350°F.

This calculator was written by Numora team and reviewed by Numora Culinary Team before publication. Both names link to full bios with verifiable credentials.

Formula source
USDA Food Safety and Inspection Service safe minimum internal temperatures
Last reviewed
2026-04-29
Reviewer
Numora Culinary Team
Calculation runs
Client-side only
NT
WRITTEN BY
Numora team
NC
REVIEWED AND APPROVED BY
Numora Culinary Team
In this review:
  • Verified the formula matches USDA Food Safety and Inspection Service safe minimum internal temperatures (FSIS 2025 guidance).
  • Confirmed the rounding rule applied by the engine: cooking time rounded to the nearest minute.
  • Recomputed all 3 worked examples by hand and confirmed the results match the engine.
  • Confirmed all 5 cited sources resolve to current pages on the issuing institution.
  • Cross-checked the 7-row comparison table for arithmetic consistency at the baseline scenario.

Reviewed on 2026-04-29 · Next review: 2027-04-29

See editorial policy

Sources & references

Every numeric assumption traces to a primary source.

  1. USDA Food Safety and Inspection Service — Safe Minimum Internal TemperaturesUSA
  2. USDA Cooking for Groups — RoastingUSA
  3. Cook's Illustrated / America's Test Kitchen technique referencesUSA
  4. Modernist Cuisine: The Art and Science of CookingINT
  5. FDA Food Code — Cooking TemperaturesUSA
  6. Numora Editorial Policy. numora.net/editorial-policy