How do I adjust cooking time when changing oven temperature?

When increasing oven temperature by 25°F (15°C), reduce cooking time by approximately 10–15%. When decreasing temperature by 25°F, increase time by 10–15%. For example, a recipe calling for 350°F for 60 minutes would take roughly 50–52 minutes at 375°F, or about 68–70 minutes at 325°F. Always check doneness with a thermometer.

How do I convert oven time to air fryer time?

For air fryer conversion: reduce oven temperature by 25°F (15°C) and reduce cooking time by 20–25%. A recipe calling for 400°F for 20 minutes in a conventional oven would be approximately 375°F for 15–16 minutes in an air fryer. Shake or flip food halfway through for even cooking.

How do I convert a slow cooker recipe to oven?

Slow cooker Low for 8 hours = oven at 325°F (160°C) for 3–4 hours. Slow cooker High for 4 hours = oven at 325°F for 2–3 hours. Slow cooker Low for 6 hours = oven at 325°F for 2.5–3 hours. Cover the dish tightly with foil or a lid to retain moisture.

How does convection oven timing differ from conventional?

Convection ovens circulate hot air, cooking food 25% faster than conventional ovens. Reduce temperature by 25°F (15°C) OR reduce cooking time by 25% — but not both. For example, 350°F conventional for 40 minutes = 325°F convection for 40 minutes, or 350°F convection for 30 minutes.

How do I adjust baking at high altitude?

Above 3,500 feet: increase oven temperature by 15–25°F, reduce sugar by 1 Tbsp per cup, reduce leavening by 25%, increase liquid by 2–4 Tbsp per cup, and reduce cooking time by 5–8 minutes per 30 minutes. At 5,000+ feet, these adjustments become more significant. The lower air pressure causes baked goods to rise faster and set slower.

What internal temperature should meat reach?

USDA safe internal temperatures: poultry (chicken, turkey) = 165°F (74°C), ground beef/pork = 160°F (71°C), beef/pork/lamb steaks and roasts = 145°F (63°C) with 3-minute rest, fish = 145°F (63°C), ham (fresh) = 145°F (63°C). Use an instant-read thermometer in the thickest part, away from bone.

Cooking Time Calculator

Adjust cooking time when changing oven temperature, scaling recipe size, switching cooking methods (oven, air fryer, slow cooker, convection), or baking at high altitude.

When you change oven temperature by 25°F (15°C), adjust cooking time by approximately 10–15% in the opposite direction. Select your adjustment type below for a precise calculation.

Cooking Time Adjustment Calculator

Original Temperature

New Temperature

Original Cooking Time

h m

Oven Type

How to adjust cooking time for different temperatures

The general rule is: for every 25°F (15°C) you increase the temperature, reduce cooking time by approximately 10–15%. Decrease the temperature by the same amount, and cooking time increases by 10–15%. This relationship isn't perfectly linear — very high temperatures cook the outside faster while the inside may need similar time, so always verify with a thermometer.

Temperature change reference

Original	At 325°F	At 350°F	At 375°F	At 400°F
30 min at 350°F	~35 min	30 min	~26 min	~22 min
45 min at 350°F	~52 min	45 min	~39 min	~34 min
60 min at 350°F	~68 min	60 min	~52 min	~45 min
90 min at 350°F	~103 min	90 min	~78 min	~68 min

Convection vs conventional oven

Convection ovens use a fan to circulate hot air, cooking food approximately 25% faster than conventional ovens. You have two options: reduce temperature by 25°F (15°C) and keep the same time, OR keep the same temperature and reduce time by 25%. Don't do both, or food will be undercooked. Convection is especially effective for roasting vegetables, baking cookies (crispier edges), and cooking meats evenly.

Air fryer cooking time conversion

Air fryers are small convection ovens with concentrated airflow, cooking even faster. The conversion from conventional oven:

Reduce temperature by 25°F (15°C)
Reduce cooking time by 20–25%
Don't overcrowd the basket — air needs to circulate
Shake or flip food halfway through
Check doneness 3–5 minutes early the first time you make a recipe

Slow cooker, oven, and stovetop conversion

Slow Cooker	Oven (325°F / 160°C)	Stovetop (simmer)	Instant Pot
Low, 8 hrs	3–4 hours	1.5–2 hours	45–60 min
Low, 6 hrs	2.5–3 hours	1–1.5 hours	35–45 min
High, 4 hrs	2–3 hours	1–1.5 hours	30–40 min
High, 3 hrs	1.5–2 hours	45–60 min	20–30 min

How to adjust cooking time when scaling a recipe

Doubling a recipe does not double cooking time. The relationship depends on the cooking method. For oven-baked dishes: increase time by 25–50% when doubling (thicker volume takes longer to heat through). For stovetop cooking: increase time by 10–20% (more liquid, but heat transfer is direct). For grilling or pan-frying individual items: time stays the same (cook in batches). When halving, reduce time by 25–30%.

Safe internal temperatures for meat

Meat / Protein	Internal Temp °F	Internal Temp °C	Note
Chicken & turkey	165°F	74°C	All cuts, no exceptions
Ground beef / pork	160°F	71°C	Burgers, meatloaf, sausage
Beef steaks & roasts	145°F	63°C	+ 3 min rest (medium-rare)
Pork chops & roasts	145°F	63°C	+ 3 min rest
Fish & shellfish	145°F	63°C	Opaque and flakes easily
Bread & baked goods	190–210°F	88–99°C	Center of loaf

Source: USDA Food Safety and Inspection Service. Always measure in the thickest part, away from bone.

High altitude baking adjustments

At elevations above 3,500 feet (1,067 m), lower air pressure causes baked goods to rise faster, lose moisture quicker, and take longer to set:

Adjustment	3,500–5,000 ft	5,000–7,000 ft	7,000+ ft
Oven temperature	+15°F	+25°F	+25°F
Sugar (per cup)	-1 Tbsp	-2 Tbsp	-3 Tbsp
Leavening (per tsp)	-⅛ tsp	-¼ tsp	-¼ tsp
Liquid (per cup)	+2 Tbsp	+3 Tbsp	+4 Tbsp
Flour (per cup)	+1 Tbsp	+2 Tbsp	+3 Tbsp

Key Takeaways

+25°F = -10–15% time; -25°F = +10–15% time.
Convection: reduce temp by 25°F OR time by 25% — not both.
Air fryer: -25°F and -20–25% time from conventional oven.
Doubled recipe: increase time by 25–50%, not double.
Always verify doneness with a thermometer, not just time.