How Much Food a Bird Actually Needs, and Why the Number Is a Starting Point
Portion size for birds is usually handled by filling the dish, which tells you nothing and makes the commonest problem — a bird eating only its favourite seeds from a full bowl — invisible. A measured portion is the fix, and the starting figure is simple.
The planning figures
The food portion calculator works from roughly 10% of body weight a day:
| Species | Typical weight | Daily food | Weekly |
|---|---|---|---|
| Budgie / Parakeet | 35 g | 3.5 g/day | 24.5 g/week |
| Lovebird | 55 g | 5.5 g/day | 38.5 g/week |
| Cockatiel | 90 g | 9 g/day | 63 g/week |
| Conure | 100 g | 10 g/day | 70 g/week |
| Finch | 13 g | 1.3 g/day | 9.1 g/week |
| Canary | 20 g | 2 g/day | 14 g/week |
| African Grey | 450 g | 45 g/day | 315 g/week |
| Cockatoo | 550 g | 55 g/day | 385 g/week |
| Macaw | 1,050 g | 105 g/day | 735 g/week |
A budgie at 35 g wants about 3.5 g a day — 24.5 g a week, which is a strikingly small amount and much less than most owners put in a dish.
Why a full bowl is the problem
Given a full bowl of mixed seed, most birds eat the highest-fat items and leave the rest. The bowl looks full because it is full of the things the bird rejected, and the owner concludes the bird is eating well while it selectively eats a diet of sunflower seeds.
A measured portion makes consumption visible. If it is gone, the bird ate it; if a third remains, you can see what a third of what.
The number is a starting point, not a prescription
Individual needs vary with age, activity, breeding condition, temperature and health. A young bird, a bird in a cold room and a bird recovering from illness all need more than the table says.
Weigh the bird, not the food, to check. A kitchen scale accurate to a gram and a perch is all it takes, and weight trend over weeks is the single most useful health indicator a keeper has. Birds hide illness; the scale does not.
A sustained drop of a few per cent warrants a vet. Not a diet adjustment — a vet.
Weight is not the same as amount eaten
Much of what goes in the dish ends up on the floor. Scattering is normal foraging behaviour and it means the portion that disappears overstates what was consumed — another argument for weighing the bird rather than inferring from the bowl.
What the figure says nothing about
Composition, which matters more than quantity. An all-seed diet at exactly the right weight is still an all-seed diet, and it is associated with materially shortened lifespans in companion parrots.
What a balanced diet looks like varies by species and is a conversation for an avian vet rather than a calculator. Converting a seed-addicted bird to a better diet is also a genuinely difficult process that should be done with veterinary guidance, because a bird that simply stops eating is in danger within days.
Foods that are dangerous
Avocado, chocolate, caffeine, alcohol, onion and garlic, and anything salted are all harmful to birds, some of them severely and in small quantities. Fruit pits and apple seeds contain compounds best avoided.
This is not an exhaustive list, which is the point: check before offering something new rather than assuming that what is safe for a person is safe for a 35-gram animal.
Using the calculator sensibly
Take the figure as the starting portion, measure it rather than eyeballing it, and then let the bird's weight over the following weeks tell you whether it is right. That loop — portion, weigh, adjust — is the whole method, and it catches problems long before they are visible.
How to weigh a bird
A digital kitchen scale reading to one gram, with a perch or a bowl taped to it and tared. Weigh at the same time of day — first thing, before feeding, is the consistent choice — and write it down.
A single weight tells you almost nothing. A column of weights over weeks tells you a great deal, and it is the earliest warning available for most of the things that go wrong.
Feeding on a schedule rather than ad lib
Measured portions offered at set times make consumption legible and make a bird noticeably more interested in food, which helps enormously when converting a diet or introducing something new.
It also makes foraging work, because a bird with a permanently full bowl has no reason to work for anything. The portion and the enrichment are the same project — see the rotation guide.
What it is not is restriction. The measured amount is the amount the bird needs; the point is knowing whether it was eaten.
Fresh food, and what happens to it
Vegetables and some fruit belong in most companion parrot diets, and they spoil. Offer them for a few hours and remove what is left rather than leaving it to go over in a warm room — bacterial growth in old food is a real risk in a small animal.
Which vegetables, and in what proportion, varies by species and is worth asking an avian vet rather than guessing from a general list.
The short version
Start at roughly 10% of body weight a day, measure it rather than filling the bowl, weigh the bird weekly, and take any sustained change to a vet. The number is where you begin; the scale is what tells you whether it was right.
And treat composition as the bigger question. Getting the quantity right on the wrong diet is precision applied to the wrong variable, and diet is the single largest thing an owner controls about how long the bird in the lifespan table actually lives.
If your bird is currently on all seed, that conversion is the most valuable thing you can do for it — and it is the one to do with veterinary guidance rather than alone.
Nothing here is veterinary advice. Anything about a specific bird's health, weight or behaviour is a conversation for an avian vet, who can examine the bird.