Free Kitchen Calculators
for US Cooks and Party Hosts
36 free calculators covering everything from Thanksgiving turkey to brisket servings, party drinks, recipe scaling, and baking conversions. Built for US cooks using US measurements: pounds, cups, ounces, and degrees Fahrenheit.
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Kitchen and Party Food Planning Guide: Portions, Conversions, and Safety
Feeding a crowd is a math problem wearing an apron. How many pounds of brisket for 40 people? How long does a 20 pound turkey take to thaw? How many bags of ice does a backyard graduation party need in July? This guide gathers the per-person numbers American caterers and pitmasters rely on, the kitchen conversions that trip people up, and the federal food safety temperatures that keep everyone healthy.
Start with the right calculator
| Occasion or task | Start with | Then |
|---|---|---|
| Thanksgiving | Thanksgiving Turkey | Turkey Thawing Time, Stuffing, Gravy |
| Backyard BBQ | Brisket, Pulled Pork, or Ribs | Burgers and Hot Dogs |
| Seafood boil | Crawfish Boil | Crab Legs, Oyster Roast |
| Drinks for a party | Party Alcohol | Keg, Wine, Party Ice |
| Scaling a recipe | Recipe Scaler | Cups to Grams, Stick of Butter |
| Baking | Baker’s Percentage | Sourdough Hydration, Baking Pan Conversion |
Per-person and conversion numbers worth memorizing
- Turkey: plan 1 to 1.5 pounds of whole bird per guest. USDA guidance is about 24 hours of refrigerator thawing for every 4 to 5 pounds, or about 30 minutes per pound in cold water changed every 30 minutes.
- Smoked meats: brisket loses roughly half its raw weight during trimming and cooking, and pork shoulder about 40 percent. Plan about 1/2 pound of raw meat per adult for brisket or pulled pork.
- Butter: one US stick is 1/2 cup, 8 tablespoons, 4 ounces, or about 113 grams.
- Flour and sugar: one cup of all-purpose flour weighs about 120 to 125 grams, and one cup of granulated sugar about 200 grams, which is why weighing beats scooping.
- Drinks: a standard US drink contains about 14 grams of pure alcohol: 12 ounces of 5 percent beer, 5 ounces of 12 percent wine, or 1.5 ounces of 80 proof spirits. A 750 ml bottle of wine pours about 5 glasses, and a half-barrel keg holds 15.5 gallons, about 165 twelve-ounce pours.
- Ice: plan about 1 pound per guest for drinks, and double it on hot days or when ice also chills the coolers.
Safe minimum internal temperatures
USDA food safety guidance calls for 165°F for all poultry, 160°F for ground beef and pork, and 145°F for whole cuts of beef, pork, veal, and lamb followed by a 3 minute rest. Hold hot food at 140°F or above and cold food at 40°F or below, and do not leave perishable food out for more than 2 hours (1 hour above 90°F).
Worked examples
Houston, Texas graduation party for 60. At 1/2 pound of raw brisket per adult, plan 30 pounds raw, about three 10 pound packer briskets, which yields roughly 15 pounds cooked. Add 60 to 90 pounds of ice if the party runs through a July afternoon.
Chicago, Illinois Thanksgiving for 12. At 1.5 pounds per guest, a 16 to 18 pound turkey. Refrigerator thawing at 4 to 5 pounds per day means it should move from the freezer to the fridge on the Saturday before Thanksgiving.
New Orleans, Louisiana crawfish boil for 25. Most locals plan 3 to 5 pounds of live crawfish per person, so a 25 person party needs about 75 to 125 pounds, or roughly two to four 35 to 40 pound sacks.
Common kitchen math mistakes
- Converting dry ingredients with the fluid ounce on a measuring cup.
- Scaling baking times along with ingredient amounts when doubling a recipe.
- Thawing a turkey on the counter instead of in the fridge or cold water.
- Planning drinks for the guest count without adjusting for the length of the event.
Quick answers
How do I scale a recipe that serves 6 to serve 15? Multiply every ingredient by 15 / 6 = 2.5. Spices, salt, and leaveners often need a little less than straight scaling, and cooking time depends on pan depth rather than the total amount. The Recipe Scaler handles the unit conversions.
How many pizzas for 20 people? Plan about 3 slices per adult, so 60 slices, or 8 large 8-slice pizzas. Teenagers can push that to 4 slices each. The Pizza Party Calculator adjusts for kids and appetites.
Official references
Thawing, cooking, and holding guidance comes from the USDA Food Safety and Inspection Service and FoodSafety.gov’s safe minimum temperature chart. The standard drink definition is published by the National Institute on Alcohol Abuse and Alcoholism.