Whole chicken Cooking Time Calculator — Time, Temperature & Method

Whole chicken Cooking Time Chart

Weight	Cooking time	Internal temp
1 kg	1 hr	74°C
1.2 kg	1 hr 8 min	74°C
1.4 kg	1 hr 16 min	74°C
1.5 kg	1 hr 20 min	74°C
1.6 kg	1 hr 24 min	74°C
1.8 kg	1 hr 32 min	74°C
2 kg	1 hr 40 min	74°C
2.5 kg	2 hr	74°C

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How This Calculator Works — Formula & Method

Source: standard UK roasting guidance · applied deterministically · verify with a thermometer

Constant	Value	Source
Min per 500 g	20 min (range 18–22)	UK roasting guides
Internal target	74°C / 165°F	FSA / thermometer
Base offset	20 min	Standard
Oven	180°C fan	Method
Resting	15 min	Best practice

— Whole chicken cooking time —
total_min = min_per_500g × (weight_g / 500) + base_offset
range = [lo_per_500g … hi_per_500g] × (weight_g / 500) + base_offset
conventional_oven = fan_temp + 10–20°C (same time)
fahrenheit = derived table from °C
— 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 40 minutes per kg plus 20 minutes at 180°C, to 74°C internal. Roast at 180°C fan — 20 min per 500 g plus 20 min. Internal 74°C in the thickest part.

Cook at 180°C fan (200°C conventional / 375°F). Internal target 74°C. Rest 15 minutes.