Serving Size Calculator
Meat shrinks, rice swells — buy by the raw weight.
Work out Serving Size. Meat shrinks, rice swells — buy by the raw weight. States the assumption instead of hiding it.
Meat 70–80%, rice about 300%, dried pasta about 240%
Raw quantity to buy
2.13 kg
1.6 kg cooked, across 8 servings
Meat loses 20 to 30% of its weight in cooking, mostly as water, so buying by the plated portion under-buys every time. Bone-in cuts lose more again once the bone is discounted — for a bone-in roast, allow about half as much again as the boneless equivalent.
How the Serving Size Calculator works
The raw quantity needed for a target cooked portion, allowing for what cooking does to the weight. Meat loses 20 to 30%; rice and pasta gain, which is why the raw figure looks so small in the packet.
Also known as: how much meat per person · raw to cooked weight calculator · how much rice per person · portion size for a dinner party
Cooking moves weight in both directions
Meat loses 20 to 30% of its weight in cooking, almost all of it water lost as steam. Higher heat and longer cooking both increase it, which is why a well-done steak weighs noticeably less than a rare one cut from the same piece.
Rice and dried pasta move the other way, absorbing water and gaining substantially — rice roughly triples and pasta roughly doubles and a half. Which is why 75 g of dried pasta looks absurdly small in the packet and is a normal portion on the plate.
Buying by the plated portion therefore under-buys meat and over-buys pasta, in both cases by a large margin. Working backwards from the cooked portion through the yield is the only way to get the shopping list right.
Bone, and what a chicken actually yields
A whole chicken yields roughly half its raw weight as edible meat once the carcass is discounted. A 1.8 kg bird gives around 900 g, which is four to six portions rather than the eight the raw weight might suggest.
Bone-in cuts generally need about half as much again as the boneless equivalent to deliver the same portion. The exact share varies by cut — a rib of beef differs considerably from a chicken thigh.
That does not make bone-in more expensive per portion. Bone-in cuts are usually cheaper per kilogram and the bones make stock, so the saving frequently survives the waste. It is a calculation worth doing rather than assuming either way.
Portions, and whose portion
Restaurant portions are larger than nutritional guideline portions, and both vary enormously by country. Catering at home to remembered restaurant portions is a common reason quantities feel excessive and a common reason they are.
Mixed groups are handled by weighting rather than headcount — children at roughly half an adult, adjusted up for teenagers. It is the same weighting the party calculator uses and it makes the per-person figure comparable.
Leftovers are better planned as extra servings than as a percentage. Adding two servings keeps the portion size honest; adding 20% quietly inflates every portion and produces both more food and larger plates than intended.
Where to go next
The Serving Size question rarely arrives on its own. These are the ones that usually come with it:
- Party Food Calculator — A four-hour party is not twice a two-hour one.
- Cooking Time Calculator — Twice the weight is nowhere near twice the time.
- Meal Cost Calculator — Portion cost, not whole-pack cost.
- Ring Size Calculator — Finger measurement to US, UK, EU and Japanese sizes.
Frequently asked questions
How much meat should I buy per person?
Work backwards from the plated portion and the cooking yield. A 200 g cooked portion at 75% yield needs about 267 g raw, and bone-in cuts need more again.
How much does meat shrink when cooked?
Typically 20 to 30%, mostly water lost as steam. Higher heat and longer cooking both increase it, which is why a well-done steak weighs noticeably less than a rare one.
How much dried pasta per person?
Around 75 to 100 g dried, which roughly doubles and a half in cooking. It looks absurdly small in the packet and is a normal portion on the plate.
How much rice per person?
About 60 to 75 g uncooked, which roughly triples. The same trap as pasta — the raw weight looks wrong until it is cooked.
How do I account for a bone-in joint?
Allow roughly half as much again as the boneless equivalent, since the bone is weight you do not eat. The exact share depends on the cut.
Should I plan for leftovers?
Deliberately, if you want them. Adding servings is more reliable than adding a percentage, because it keeps the portion size honest rather than quietly inflating it.
How much does a chicken yield?
Roughly half its raw weight as edible meat once the carcass and bones are discounted. A 1.8 kg bird gives around 900 g of meat, which is four to six portions.
Do slow-cooked meats shrink more?
By weight yes, though the texture is the point — long cooking breaks down collagen into gelatine, which is why a shoulder that has lost 40% is better eating than one that lost 20%.
How much salad per person?
About 80 to 100 g of leaves as a side, which looks like a great deal of volume for very little weight. Dressed salad is the item most often over-prepared.
What is a standard restaurant portion?
Larger than a nutritional guideline portion, and it varies enormously by country and venue. Catering to restaurant portions at home is a common reason quantities feel excessive.
How do I scale for a mix of adults and children?
Count children as roughly half an adult for planning, adjusting up for teenagers. The same weighting the party calculator uses works here.
Does bone-in meat cost more per edible portion?
Often less, despite the waste, because bone-in cuts are usually cheaper per kilogram and the bones make stock. The saving depends on the cut and the price gap.
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