Bird Weight Comparison (Body Mass KG)
Bird body weights in kg, from bee hummingbird 0.002 to ostrich 104. Zoological mass specs with linked converter tool. See all 15 top birds listed here.
Visual comparison
All values
Click any row to load it as Entry A.
| Name | Value | Context | Source |
|---|---|---|---|
| Bee Hummingbird Cheapest row here. Smallest bird. | 0 kilograms | Cuba, avg 2.28g male 1.95 female 2.6 | Animal Diversity Web Mellisuga helenae avg 2.28g |
| Barn Owl Silent hunter mid. | 0.52 kilograms | Range 430-620g, male 470 female 570 | Animal Diversity Web Tyto alba 430-620g |
| Peregrine Falcon Crow sized stoop king. | 0.91 kilograms | Avg 907g, females 40-50 percent heavier | Animal Diversity Web Falco peregrinus 907g |
| Bald Eagle Females larger. Plumage alone 0.7. | 4.3 kilograms | Average adult | Animal Diversity Web Haliaeetus leucocephalus 4.3kg |
| Golden Eagle female Highly dimorphic. | 5 kilograms | Female 3.94-6.125, male 3-4.5 | Animal Diversity Web Aquila chrysaetos female mid 5.0 |
| Wandering Albatross Largest flying wingspan. | 8.13 kilograms | Avg 8130g range 5.9-12.7 | Animal Diversity Web Diomedea exulans avg 8.13kg |
| Wild Turkey male Thanksgiving dimorphism. | 8.9 kilograms | Male 6.8-11, female 3.6-5.4 | Animal Diversity Web Meleagris gallopavo male mid 8.9 |
| King Penguin Second largest penguin. | 11.8 kilograms | Avg range 9.3-17.3 | Animal Diversity Web Aptenodytes patagonicus avg 11.8 |
| Mute Swan Sex and season variable. | 11.9 kilograms | Range 7.6-14.3 | Animal Diversity Web Cygnus olor 7.6-14.3; Audubon guide |
| Andean Condor male Soaring scavenger. | 15 kilograms | Male to 15, female near 11 | Britannica condor: male 15kg female 11kg |
| Greater Rhea Males larger. | 23 kilograms | Range 15-30 | Smithsonian National Zoo Rhea 15-30kg |
| Emperor Penguin Winter breeder. | 31.5 kilograms | Avg range 25-45 | Animal Diversity Web Aptenodytes forsteri avg 31.5kg |
| Emu Captive ranges run heavier. | 33 kilograms | Avg, max 70 | Wikipedia largest birds avg 33 max 70; National Zoo |
| Southern Cassowary female Dagger claw giant. | 76 kilograms | Female 76 male 55 | San Diego Zoo cassowary female 76 male 55 |
| Common Ostrich Priciest row here. Flightless king. | 104 kilograms | Avg North African male, max 156.8 | Animal Diversity Web Struthio 90-130 + Wiki avg 104 |
About this converter
Adult body mass runs 0.00228 to 104 kilos across flying and flightless birds. Bee hummingbirds average 2.28 grams, barn owls 520, peregrines 907, bald eagles 4.3, golden eagle females 5, albatrosses 8.13, turkey males 8.9, king penguins 11.8, mute swans 11.9, condor males 15, rheas 23, emperor penguins 31.5, emus 33, cassowary females 76 and ostriches 104 average toward 156.8 max. Sex dimorphism splits eagles, condors, turkeys and cassowaries, with rows naming the sex used. Averages anchor rows since seasons swing individuals.
How to use it
Pick two birds and a unit in the top row. The three boxes below stay linked. Change any box and the other two update. Try 1 ostrich against hummingbirds to see the forty five thousand to one gap. Switch to grams for small bird math. Log scale bars keep both readable.
Captive ranges run heavier than wild averages for emus and swans. False 200 kilo ostrich claims never verify against 156.8 measured max. Ruby-throated hummingbirds near 3.6 grams stay out to keep one tiny anchor. Plumage alone weighs 700 grams on bald eagles.
FAQ
What is the smallest bird?
Bee hummingbird at 2.28 grams average. Males 1.95, females 2.6.
How heavy is an ostrich?
104 kilos average toward 156.8 max. Flightless king here.
Why name sexes in rows?
Eagles, condors, turkeys and cassowaries differ sharply by sex.
How many hummingbirds equal an ostrich?
About forty five thousand bee hummingbirds per ostrich.
Sources
- Animal Diversity Web: ostrich, emu, penguins, albatross, eagles, turkey, falcon, owl, hummingbird mass accounts
- Britannica condor (male 15 female 11), Audubon mute swan guide, Smithsonian rhea, San Diego Zoo cassowary
Last verified: 2026-10-01 · 15 entries
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