Use the free Roast Chicken Quantity Calculator below, right in your browser. No sign-up, no software to install, and nothing is sent to a server.
Roast chicken is the most forgiving roast in the kitchen, and it is also the one where the form you buy changes the maths the most. A whole bird, a tray of bone-in thighs, and a pack of boneless breasts are three different shopping problems, even though they all end up as roast chicken on the table. This calculator works out the raw weight for the form you plan to cook, and turns it into a bird count when you buy whole birds.
Whole birds need about 500 grams per person for a standard appetite, 400 grams for light eaters, and 650 grams for hearty eaters. That sounds like a lot, but bones, skin, and the cavity make up a large share of a whole bird, and the cooked meat is much less than the raw weight. A typical supermarket bird weighs about 1.8 kilos, so a standard appetite works out to roughly one bird for every three to four guests.
Bone-in parts, such as thighs, drumsticks, and wings, need about 400 grams per person standard, 300 grams light, and 550 grams hearty. Parts cook faster than a whole bird, they are easier to serve, and everyone can pick their favourite piece, which usually means the dark meat disappears first. If your group strongly prefers legs over breast, buy extra thighs rather than increasing the total weight, since the extra breast meat would go uneaten.
Boneless parts need much less: about 250 grams per person standard, 200 grams light, and 325 grams hearty. Boneless breasts and thighs are almost all meat, so the raw weight is close to what lands on the plate apart from moisture loss. They also cook fastest and dry out fastest, so they reward a thermometer and a short rest more than extra time in the oven. Boneless thighs are more forgiving than breasts and are usually cheaper too.
Children and side dishes shift the numbers as usual. A child under ten eats about half an adult portion, so count two children as one adult. A meal with roast potatoes, vegetables, bread, and salad lets you lean toward the light end, while a simple meal where chicken is nearly the whole plate calls for the standard or hearty setting. If the chicken is one of several mains, for example at a buffet, the light setting is usually enough.
Fresh and frozen chicken need the same weight for planning, but frozen birds need time to thaw safely: about twelve hours per kilo in the fridge, so a 2 kilo bird needs a full day. Never thaw chicken at room temperature, and never refreeze raw chicken that has thawed. If you buy parts, they thaw faster, often overnight, and they are easier to store flat in the freezer in portion-sized bags.
Cooking a whole bird well is mostly about temperature and rest. Roast at around 200 degrees for the first twenty minutes to crisp the skin, then lower the heat and cook until the thickest part of the thigh reaches 74 degrees. A thermometer in the thigh, away from the bone, is the only reliable test: juices running clear is a rough guide, not a guarantee. Basting helps the skin but does little for the meat, so do not open the oven constantly.
Resting is short for chicken but still matters. Rest a whole bird for 15 minutes, loosely tented, before carving, and rest parts for 10 minutes. The juices settle, the meat stays moist, and the skin stays crisp if you do not wrap the bird tightly. Use the resting time to make gravy from the pan juices and to finish the vegetables.
Carving a whole bird is simple once you know the order. Remove the legs first by cutting through the joint, then slice the breast meat in even slices. Separate drumsticks from thighs if you want more pieces, and offer the wings to anyone who likes them. Save the carcass for stock: simmered with an onion, a carrot, and a bay leaf, it makes soup that stretches the meal to a second day.
Leftovers are one of the best reasons to roast a slightly larger bird. Cold chicken makes sandwiches, salads, and wraps, and it keeps in the fridge for two to three days. If you want leftovers on purpose, add about a quarter to the calculator result, or simply buy one extra bird for a large group. Store the meat in a sealed container within two hours of cooking, and slice it before storing so it cools fast.
Budget is kind to chicken compared with other roasts. Whole birds are usually the cheapest per kilo, parts cost more for the convenience, and boneless breasts are the dearest. For a crowd, whole birds almost always win on price, and two medium birds often cook better than one very large one, since they roast faster and give you twice as many legs.
To use the calculator, enter your guest count, choose whole birds or parts, and choose the appetite. You will get the raw weight to buy, a bird count for whole birds, and a resting reminder. Buy the birds closest to that weight, cook to 74 degrees in the thigh, rest before carving, and your roast chicken will feed the table with enough to spare.
Versión en español: Calculadora de Cantidad de Pollo Asado – Peso del Pollo Entero por Invitado