Chicken Cooking Time Chart (by weight)
Roast at 180°C fan. Juices must run clear and the thickest part reach 74°C. Rest 15 min.
| Weight | Cooking time | Internal temp |
|---|---|---|
| 3 lb | 1 hr 14 min | 165°F |
| 4 lb | 1 hr 33 min | 165°F |
| 5 lb | 1 hr 51 min | 165°F |
| 6 lb | 2 hr 9 min | 165°F |
| 7 lb | 2 hr 27 min | 165°F |
| 8 lb | 2 hr 45 min | 165°F |
Chicken Cooking Times by Weight
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How This Calculator Works — Formula & Method
Source: standard US roasting guidance · applied deterministically · verify with a thermometer
| Constant | Value | Source |
|---|---|---|
| Time per lb | 18 min/lb (range 18–22/500 g) | US roasting guides |
| Internal target | 165°F / 74°C | USDA / thermometer |
| Base offset | 20 min | Standard |
| Oven | 375°F | Method |
| Resting | 15 min | Best practice |
— Chicken cooking time —
total_min = min_per_500g × (weight_lb × 453.592 / 500) + base_offset
range = [lo_per_500g … hi_per_500g] × (weight / 500) + base_offset
conventional_oven = fan_temp + 10–20°C (same time)
celsius = derived table from °F
— algorithm —
lookup(meat, cut, doneness) → point_estimate → guidance_range
→ internal_target_temp → verify_with_thermometer()
total_min = min_per_500g × (weight_lb × 453.592 / 500) + base_offset
range = [lo_per_500g … hi_per_500g] × (weight / 500) + base_offset
conventional_oven = fan_temp + 10–20°C (same time)
celsius = derived table from °F
— algorithm —
lookup(meat, cut, doneness) → point_estimate → guidance_range
→ internal_target_temp → verify_with_thermometer()
Public roasting guidance applied deterministically — this is not a food-safety authority. Always cook to the stated internal temperature, measured with a meat thermometer.
Frequently Asked Questions
About 18 minutes per lb plus 20 minutes, at 375°F, to an internal temperature of 165°F.
Chicken should reach an internal temperature of 165°F (165°F / 74°C). Roast at 180°C fan. Juices must run clear and the thickest part reach 74°C. Rest 15 min.
Yes. A fan (convection) oven runs about 20°C / 35°F hotter than conventional — use 375°F / 180°C for the times shown. Roast at 180°C fan. Juices must run clear and the thickest part reach 74°C. Rest 15 min.
🇬🇧 Cooking in kg & °C? Use the UK chicken calculator →