US Trends

how long to cook a roast chicken

A good rule of thumb: roast chicken time depends on weight and oven temperature, but always confirm doneness with a thermometer (165°F / 74°C in the thickest part of the thigh).

Quick Scoop

For a standard whole chicken, here’s a simple guide for how long to cook a roast chicken in a home oven:

  • At 425°F (220°C):
    • Roast about 65–90 minutes for a 3.5–5 lb (1.6–2.3 kg) chicken, checking earlier if your bird is on the smaller side.
  • At 400°F (200°C):
    • Plan roughly 15 minutes per pound (about 33 minutes per kg), then start checking for doneness a bit early.
  • At 350°F (175°C):
    • A 3 lb (1.4 kg) chicken can cook in a little over 1 hour ; larger birds take longer.

No matter the timing, the chicken is properly cooked when:

  • The internal temperature in the thickest part of the thigh (not touching bone) is 165°F / 74°C.
  • Juices run clear (not pink) when you pierce near the leg joint.

Let it rest 10–15 minutes before carving so the juices redistribute and the meat stays moist.

Simple timing formula example

If you like a moderate oven (around 350–375°F / 175–190°C), many cooks use:

  • About 20 minutes per pound (45 minutes per kg) at 350°F/175°C after an initial hot blast , e.g., 10 minutes at 450°F/220°C, then 20 minutes per 1 lb (500 g) at 350°F/180°C until it hits 165°F.

So, for a 4 lb (1.8 kg) chicken using that style:

  1. 10 minutes at 450°F/220°C.
  2. Then about 80 more minutes at 350°F/180°C (20 minutes × 4).
  3. Start checking the internal temperature a bit early.

Mini FAQ

  • Is time or temperature more important?
    Time gives you a ballpark; temperature is the final judge. Always go by 165°F/74°C in the thigh.
  • What if my chicken is smaller or not trussed?
    It may cook 10–15 minutes faster , so check the temp early and don’t rely only on the clock.

TL;DR: For “how long to cook a roast chicken,” think roughly 1–1.5 hours for an average 3.5–5 lb bird , depending on oven temp, and always finish by checking that the thigh registers 165°F / 74°C.

Information gathered from public forums or data available on the internet and portrayed here.