Reviewed against Merck Veterinary Manual, peer-reviewed avian nutrition literature and Association of Avian Veterinarians guidance — August 2026. Estimate only, not a feeding prescription.
Bird Feed Calculator: Estimate Your Bird's Daily Food in Grams
This bird feed calculator gives you a planning estimate of how much food your bird is likely to need each day, in kilocalories and grams. It uses published avian energy equations, your bird's current weight and its activity level. It is a starting point for portioning, shopping and monitoring, not a diet prescription. No calculator can set a diet for a specific bird, because energy needs vary widely between species and individuals. Weigh your bird regularly and let the weight trend, not the number below, decide what you actually feed.
Daily Feed Estimate
Enter your bird's details to get an estimated daily energy need and the approximate weight of food that represents. This is a planning estimate, not a prescribed ration.
Your estimate
Why this is an estimate and not a feeding requirement
Companion bird nutrient requirements are largely extrapolated from poultry research. Very few controlled feeding trials exist for pet parrots, canaries or softbills. That gap is the honest reason this page gives a range.
The energy equation used here scales with body weight and separates songbirds from other birds. It does not know your bird's species, digestive efficiency, room temperature, molt status or personality. Two birds of identical weight can differ substantially.
So treat the output as a planning figure. It helps you portion fresh food, judge whether a bag will last a month, and spot when a reported intake is wildly off. It does not tell you what to put in the bowl.
Weighing your bird in grams
A gram scale is the single most useful bird care tool you can own. Body weight changes before most owners notice anything else, because birds instinctively conceal illness until it is advanced.
Use a digital kitchen or pet scale that reads in whole grams, with a perch or a flat platform. Weigh at the same time each day or week, ideally in the morning before the first feed, and write the number down.
Ounces are too coarse for small birds. A budgerigar can lose a clinically serious fraction of its body weight inside a reading that still shows the same ounce value.
Reading the weight trend
A single weight means very little. A run of weights means a great deal. Small day-to-day movement is normal and reflects crop contents, droppings and hydration.
What matters is direction over weeks. A steady downward drift, a sudden drop, or a climb you did not intend are all reasons to speak to an avian vet rather than to adjust portions yourself.
This page deliberately avoids quoting a fixed percentage change as the danger threshold. Published thresholds vary and a figure that is trivial in a macaw can be critical in a finch. Judge it against your own bird's baseline.
Pellets, seeds and fresh foods
Strictly seed-based diets are documented as suboptimal for parrots, being deficient in vitamin A, calcium, and the amino acids lysine and methionine. Supplementing a seed diet does not reliably fix this, partly because birds select the seeds they like.
Formulated pelleted and extruded diets were designed to remove that selection problem, since the nutrients are built into every piece. Clinical reporting credits them with substantial improvement in pet bird health.
Pellet quality varies and brands must be judged individually. Excess is also a real risk: oversupplementation of vitamin A and vitamin D3 causes documented toxicity, and adding a multivitamin on top of a complete pellet is how that usually happens.
Fresh vegetables, dark leafy greens and limited fruit add variety and foraging value. Extra items should not be allowed to unbalance the formulated part of the diet.
Why one percentage does not fit every bird
The commonly repeated advice that pellets should be sixty to eighty percent of intake reflects clinical convention and manufacturer guidance for granivorous parrots. It is not an established requirement, and it does not transfer to every group.
Lories and lorikeets are nectar feeders and need a high moisture diet with readily digestible carbohydrate. Dry parrot pellets are not equivalent, and feeding them as a staple to a lory is a substitution the species is not built for.
Canaries and finches were historically fed seed mixes that are documented as low in vitamins A, D3, E and K, poor in calcium to phosphorus balance, and short of lysine and methionine. Formulated diets, greens and egg food are used to close those gaps.
Toucans and mynahs sit in a different category again. Iron storage disease is common in these species, so a low-iron diet is the priority, with dietary iron guidance for toucans and mynahs currently set under fifty to one hundred parts per million.
Pigeons and doves swallow seed whole and use grit mechanically. Parrots remove the hull before swallowing and do not need grit, which is one of the myths that avian nutrition research has actively overturned.
Changing your bird's diet safely
Diet transition is the point where well-intentioned owners cause the most harm. Birds recognize food by sight and texture and can simply refuse an unfamiliar item, even to the point of starvation.
Move gradually, keep the familiar food available while the new food is introduced, and weigh daily rather than weekly through the transition. Losing weight during a conversion means the conversion is failing.
Small species have almost no reserve. A canary, finch or budgerigar that stops eating can deteriorate within a day or two, which is why supervised conversion matters most in exactly the birds owners assume are hardiest.
Sudden large increases in dietary protein are also worth avoiding, because an abrupt rise can overload the kidneys and produce visceral gout. Increase protein gradually if there is a reason to increase it at all.
Foods to avoid
Veterinary guidance advises owners not to feed birds chocolate, caffeinated drinks, alcohol, salty or sugary junk food, milk products, onions, avocado, or apple seeds.
Avocado deserves particular emphasis, as it is specifically identified as toxic to small parrots. The seeds and pits of several fruits are also excluded from safe lists, so remove them before offering the flesh.
Vitamin and mineral supplementation through the drinking water is not recommended. Intake cannot be standardized, some minerals destroy vitamins, and unpleasant taste can reduce water consumption and cause dehydration.
If you are unsure about a specific food, do not test it. Ask an avian veterinarian first.
Life stages this calculator will not estimate
Unweaned chicks being hand-fed are excluded entirely. Formula concentration, volume, temperature, frequency and weaning progression are species and age specific, and errors cause aspiration, crop burn, crop stasis and stunting.
This page will not generate a hand-rearing formula under any circumstances, because a generic figure applied to a chick is genuinely dangerous. Hand-rearing belongs with an avian veterinarian or an experienced breeder working alongside one.
Breeding, laying and chick-feeding birds are also excluded. Protein and calcium demands rise sharply, requirements differ from maintenance in all species, and calcium management during laying is clinical work.
Birds losing weight, birds that are unwell, and birds on any weight-reduction plan are excluded as well. Restricting food in a bird can precipitate hepatic lipidosis, which is a documented cause of death in captive birds.
When to see an avian veterinarian
Contact an avian vet for any unexplained weight change, reduced appetite, change in droppings, fluffed or quiet posture, labored breathing, or a change in vocalization and activity.
Also seek help before starting any weight-loss plan, before converting a reluctant bird onto a new diet, and before adding any supplement to a complete formulated food.
Not every general practice vet treats birds. The Association of Avian Veterinarians directory and the AAV bird owner resources are the practical starting points.
Methodology
Basal metabolic rate is calculated as K multiplied by body weight in kilograms raised to the power 0.75. The constant K is 129 for passerines and 78 for non-passerines, which is the standard allometric approach in avian clinical practice.
Maintenance energy is basal rate multiplied by an activity factor. Published clinical guidance places that factor between 1 and 2, with roughly 1.5 used for convalescing birds and 2 for growth.
This calculator uses 1.3, 1.5 and 1.8 for its three activity options. Those are evenly spaced points chosen by this site within the published band. They are not species-validated multipliers and the page says so in the output.
Food weight is energy need divided by energy density. Where you supply a manufacturer kcal per gram figure, that value is used. Where you do not, a placeholder of 3.5 kcal per gram is used and is labeled in the result as a site assumption.
Nothing else is modeled. Ambient temperature, molt, digestibility, wastage, feather condition and individual variation all affect real intake and none of them appear in the equation.
Known limitations
The allometric equation frequently produces figures below observed intake in birds under roughly one hundred grams. The result panel flags this for small birds, and the correct response is to feed to maintain weight rather than to ration.
The amount offered always exceeds the amount eaten. Hulls, dropped pieces and selective feeding mean bowl contents are not consumption.
Most bird food labels do not publish an energy density, which is why the manufacturer input is optional rather than required. When a brand does publish one, use it.
Older adults are not given a separate factor because no validated geriatric adjustment exists for companion birds in the published literature.
Frequently asked questions
How much should I feed my bird each day?
There is no single correct figure. Use the estimate above as a planning range, offer a complete diet, and let weekly weights confirm whether the amount is right for your individual bird.
Should I switch my bird from seeds to pellets?
Seed-only diets are documented as deficient for parrots and most commercial canary and finch mixes are documented as deficient too. Conversion is usually beneficial, but plan it with an avian vet and weigh daily throughout.
Can I just measure food by the spoon or the scoop?
Volume measures vary with pellet size, density and how you fill the scoop. Grams are the only reliable unit, and the same scale that weighs your bird will weigh the food.
My bird is overweight. How much should I cut back?
This calculator will not answer that, by design. Weight reduction in birds must be veterinary supervised, because restriction can trigger hepatic lipidosis.
Why does the calculator refuse to help with hand-feeding chicks?
Because a generic formula figure applied to an unweaned chick can kill it. Volume, concentration, temperature and frequency vary by species and age, and the failure modes are aspiration, crop burn and stunting.
Does my bird need grit?
Pigeons, doves and some passerines swallow seed whole and use grit mechanically. Parrots dehull seed before swallowing and do not need it. Routinely feeding grit to parrots is one of the debunked practices in avian nutrition.
Should I add a vitamin supplement to the water?
Supplementing through drinking water is not recommended. Intake cannot be standardized, some minerals degrade vitamins, and altered taste can reduce water intake. Ask your vet before adding anything to a complete diet.
Sources
- Merck Veterinary Manual — Nutrition in Psittacines, full review September 2025.
- Merck Veterinary Manual — Nutrition in Passerines.
- Merck Veterinary Manual — Nutritional Diseases of Pet Birds.
- Koutsos EA, Matson KD, Klasing KC. Nutrition of birds in the order Psittaciformes: a review. Journal of Avian Medicine and Surgery. 2001;15(4):257–275. DOI.
- Ullrey DE, Allen ME, Baer DJ. Formulated diets versus seed mixtures for psittacines. Journal of Nutrition. 1991;121:S193–S205.
- Koutsos EA, Klasing KC, Smith J, Woods LW. Adult cockatiels metabolically adapt to high protein diets. Journal of Nutrition. 2001;131(7):2014–2020. DOI.
- LafeberVet — Clinical Perspectives on the Principles of Avian Nutrition.
- LafeberVet — Avian Nutrition Basics.
- dvm360 — Critical care of avian patients, for the BMR and MER constants used.
- Association of Avian Veterinarians — Bird Owner Resources and Find a Vet directory.