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CookHelper

Cooking calculators for the big roast and the weeknight pot

Turkey and ham times worked back from dinner, rice water for any grain, oven dial conversions and ingredient swaps at the right ratio. No sign-up, and it works with flour on your fingers.

Quick turkey check

3 hr 45 min

unstuffed at 325°F, until the thigh reads 165°F. Full schedule →

Holiday cooking

The big roasts, timed backwards from the moment everyone sits down.

Turkey cooking timeRoast time by weight, stuffed or not, with a dinner-time schedule.Turkey thawing timeFridge or cold-water thaw, and the day to start.Turkey per personGuest count to bird size, with or without leftovers.Ham cooking timeSpiral, bone-in, boneless or fresh ham, to the right temperature.Prime rib cooking timeMinutes per pound by doneness, plus the pull temperature.

Everyday essentials

The numbers you look up on a Tuesday night.

Rice to water ratioWater, time and yield for eight kinds of rice.Oven temperature conversionFahrenheit, Celsius, fan and gas mark on one dial.Cups to gramsIngredient-aware conversions for flour, sugar, butter and more.Recipe scalerPaste a recipe, change the servings, get clean fractions.

Ingredient helpers

Out of something? Swap it at the right ratio.

Substitution finderEvery swap in one searchable list, plus an ask-a-cook helper.Buttermilk substituteLemon or vinegar and milk, yogurt, kefir.Egg substituteFlax, applesauce, aquafaba and when each works.

How the numbers are worked out

Roast times follow the USDA Food Safety and Inspection Service charts for a 325°F oven, filled in between the weight bands so a 15.6 lb bird gets its own answer rather than a range. Safe temperatures are the USDA minimums: 165°F for poultry, 145°F with a three-minute rest for whole cuts of pork, beef and fresh ham, and 140°F for reheating a fully cooked ham.

Cup-to-gram weights use King Arthur Baking’s published ingredient weight chart, and rice ratios start from the absorption rate of each grain plus the small amount that steams away from a lidded pot.

Every calculator runs in your browser the moment you change a number. The one AI feature, the ask-a-cook box on the substitution pages, only runs when you press Ask.