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Ham Cooking Time Calculator

Find how long to cook your ham.

Result

1 h 45 min
2 h 26 min

How it is calculated

The tool multiplies the weight by a fixed minutes-per-kilogram rate, for an oven at 160 °C (325 °F):

precooked = weight × 35 min and fresh = weight × 48.5 min

weight is in kilograms. The total minutes are rounded to the nearest minute and shown as hours and minutes. Both times are given at once, so you pick the line that matches your ham: a precooked ham is only being reheated, a fresh (raw) one has to be cooked through. The calculation does not look at the shape of the joint, whether it is boneless, or the starting temperature, so treat it as a planning estimate and confirm doneness with a meat thermometer.

Worked example

A 3 kg ham.

  1. Precooked: 3 × 35 = 105 min = 1 h 45 min
  2. Fresh: 3 × 48.5 = 145.5 min, rounded to 146 min = 2 h 26 min

At 160 °C, plan about 1 h 45 min if it is precooked and 2 h 26 min if it is raw.

Try this example →

Common mistakes

  • Entering the weight in pounds: the rates are per kilogram, so 6.6 lb must be entered as about 3 kg.
  • Reading the wrong line: the fresh time is about 38 % longer than the precooked time, so mixing them up leaves a raw ham undercooked or a cooked one dry.
  • Entering the weight of the ham plus the glaze or packaging and expecting precision: use the net weight of the meat.
  • Relying on the time alone: ovens differ, so check the core temperature before serving.

About this calculator

This calculator estimates ham roasting time at 160°C (325°F) based on weight, following the same guideline culinary references use: roughly 15–20 minutes per pound (about 33–44 minutes per kg), adjusted for whether the ham is precooked or fresh. A precooked (city) ham only needs reheating to a safe serving temperature of about 140°F (60°C), while a fresh, uncooked ham must be cooked all the way to a food-safe internal temperature of 145°F (63°C) per USDA guidance, which takes considerably longer for the same weight.

Home cooks use it to time holiday roasts for Christmas, Easter, or Thanksgiving so the ham is ready when guests arrive, and caterers use it to schedule oven time across multiple dishes cooking simultaneously. Enter the ham's weight and whether it's precooked or fresh to get an estimated roasting time.

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