Roast Chicken Calculator
Roasting a whole chicken to juicy perfection requires knowing exactly how long to cook it at a given temperature. Too little time and the chicken is unsafe to eat. Too much and it dries out. The USDA Food Safety and Inspection Service requires chicken to reach an internal temperature of 165 F (74 C) in the thickest part of the thigh. The cooking time depends on the weight of the bird and the oven temperature you choose. This calculator uses the standard culinary guideline of approximately 20 minutes per pound at 375 F, with adjustments for higher or lower temperatures, and then adds the standard 15-minute preheat buffer and 15-minute rest time. Enter your chicken weight and preferred oven temperature to get a complete roasting schedule.
Roasting time formula
Base time (minutes) = chicken weight (lbs) * 20 (at 375 F)
At 325 F: multiply base time by 1.20
At 400 F: multiply base time by 0.88
At 425 F: multiply base time by 0.80
Total time = roasting time + 15 min rest
Always verify doneness with a thermometer. Time estimates assume a room-temperature bird placed directly into a preheated oven.
Key roasting tips
- Preheat the oven fully before putting the chicken in. Cold ovens add unpredictable cooking time.
- Pat the chicken completely dry for crispy skin. Moisture = steam = soft skin.
- Trussing the legs together produces more even cooking and a neater presentation.
- Place the chicken breast-side up on a roasting rack to allow air circulation under the bird.
- Baste every 30 minutes if desired, but minimise oven door opening to maintain temperature.
Roast chicken: frequently asked questions
How long do I roast a chicken per pound?
At 375 F (190 C), roast chicken for approximately 20 minutes per pound, plus an additional 20 minutes. A 4-pound chicken takes about 1 hour 20 minutes. Always verify with a thermometer: the thickest part of the thigh must reach 165 F (74 C).
What temperature should I roast chicken at?
Most recipes use 375-425 F (190-220 C). Lower temperatures (325 F) produce very juicy, moist chicken but without crispy skin. Higher temperatures (425 F) produce crispier skin faster but require more attention to prevent drying out.
Where do I insert the thermometer in a whole chicken?
Insert the thermometer into the thickest part of the thigh, avoiding the bone. The thigh is the last part of the bird to reach safe temperature. The reading should be 165 F (74 C) or higher.
Should I cover chicken while roasting?
Covering the chicken for the first half of cooking retains moisture but prevents browning. Uncovering for the second half allows the skin to crisp. For maximum crispy skin, roast uncovered throughout at a higher temperature.
How long should roast chicken rest before carving?
Rest a whole chicken for 10-15 minutes after removing it from the oven. Resting allows juices to redistribute into the meat. Cover loosely with foil but do not seal it tightly, which would trap steam and soften the skin.
Official sources
- USDA Food Safety and Inspection Service: Chicken from Farm to Table.
- USDA FSIS: Safe Minimum Internal Temperature Chart.
Reviewed by the CalculatorHub team, edited by James Graham, 14 June 2026. See our methodology.