Cooking Time Calculator
Estimate how long to roast or bake a cut of meat based on its weight and cooking method. Useful any time a recipe gives minutes-per-pound instructions with a fixed preheat or resting base time.
About this calculator
Many roasting guides express cooking time as a linear function of weight plus a fixed startup allowance. The formula is: cookingTime = (weight × timePerPound) + baseTime. Here, weight is in pounds, timePerPound is the method-specific rate in minutes per pound (e.g. 20 min/lb for a medium-rare roast), and baseTime accounts for oven preheating equilibrium or a minimum cook period regardless of size. The relationship is linear — doubling the weight roughly doubles the variable portion of the time, but the base time stays constant. Always verify doneness with an internal meat thermometer; this formula gives a reliable estimate, not a guarantee, since oven calibration and starting meat temperature vary.
How to use
You are roasting a 5 lb chicken. Your recipe says 18 minutes per pound with a 15-minute base time. Enter weight = 5, timePerPound = 18, baseTime = 15. The calculator computes: (5 × 18) + 15 = 90 + 15 = 105 minutes. That's 1 hour 45 minutes total roasting time. Set your timer accordingly and check that the internal temperature reaches 165 °F (74 °C) before serving.
Frequently asked questions
How many minutes per pound should I use for a Thanksgiving turkey?
A general guideline for an unstuffed turkey roasted at 325 °F is 13–15 minutes per pound, with a base time near zero for birds over 12 lbs. A stuffed turkey needs 15–17 minutes per pound because the stuffing slows heat penetration. These are estimates — the USDA recommends always checking that the thickest part of the thigh reaches 165 °F. Brined or pre-basted birds may cook slightly faster.
What is the base time in the cooking time formula and why does it matter?
Base time represents a fixed cooking period that applies regardless of the meat's weight — often accounting for the time it takes the oven environment to stabilize around the roast, or a minimum safe cooking window. Without it, a very small piece of meat could calculate to an unrealistically short cook time. For many roasting formulas the base time is 0, but some recipes add 20–30 minutes for larger cuts like prime rib. Always check the specific recipe guidance for the cut you're preparing.
Why does the cooking time formula sometimes give inaccurate results for large cuts?
The linear formula assumes uniform heat penetration, but very large or thick cuts have a higher volume-to-surface ratio, which slows heat transfer to the center. Starting meat temperature also matters — a cold-from-fridge roast takes longer than one at room temperature. Bone-in cuts conduct heat differently than boneless ones. For precision cooking, use the formula as a planning estimate and rely on an instant-read thermometer to confirm doneness.