415,000,000 t915,000,000,000 lb
Every human on Earth together weighs about 415 million tonnes (915 billion lb). That is our calculation: 8.3 billion people, the UN’s figure for mid-2026, times an average of 50 kg (110 lb), children included. A 2023 study in PNAS reached a similar 390 million tonnes, over six times the weight of all wild mammals.
| 8.3 billion people at 50 kgThe figure on this page: UN projection for mid-2026 | 415,000,000 t915,000,000,000 lb |
|---|---|
| 8.1 billion people at 50 kgSame calculation with the UN figure for mid-2023 | 405,000,000 t893,000,000,000 lb |
| Greenspoon et al. (2023)About 8 billion people, all ages | 390,000,000 t860,000,000,000 lb |
| Adults only, if every country had US body sizesWalpole et al. (2012), 2005 population | 345,000,000 t761,000,000,000 lb |
| Adults only, 2005Walpole et al. (2012), average adult 62 kg | 287,000,000 t633,000,000,000 lb |
Nobody can put humanity on a scale, so every figure is a multiplication. Ours is 8.3 billion people x 50 kg = 415 billion kg, or 415 million tonnes. The 50 kg is an average over everyone alive, babies and children included, which is why it sits well below a typical adult’s weight.
The 8.3 billion comes from the UN’s World Population Prospects 2024, which puts the world at about 8.30 billion on 1 July 2026. The population keeps moving: it was about 8.09 billion in mid-2023, which at 50 kg each gives 405 million tonnes, and the US Census Bureau projects 8.2 billion for July 2026, which gives 410 million tonnes. Uncertainty in the average weight matters more than the last 100 or 200 million people.
Our number lines up with the research. In 2023, Lior Greenspoon and colleagues at the Weizmann Institute put the total weight of humans at about 390 million tonnes, which works out to just under 50 kg per person for a population of about 8 billion.
The most detailed count of adult weight is “The weight of nations”, published in BMC Public Health in 2012 by Sarah Walpole and colleagues. Using 2005 data, it found the world’s adults weighed about 287 million tonnes, with an average adult body mass of 62 kg (137 lb).
That average hides big regional gaps. The average adult in North America weighed 80.7 kg (178 lb), compared with 70.8 kg in Europe, 60.7 kg in Africa and 57.7 kg (127 lb) in Asia. Put another way, one tonne of people is about 12 North American adults or 17 Asian adults. North America had about 6% of the world’s adults but 34% of its obesity biomass.
The authors also asked what would happen if every country had the US distribution of body size. Adult biomass would rise by 58 million tonnes, about 20%, the same as adding 935 million people of average weight.
The 2023 Weizmann study weighed humanity against the rest of the mammal world. Livestock, mostly cattle, come to about 630 million tonnes, heavier than all humans. All wild land mammals together weigh only about 20 million tonnes, and wild marine mammals about 40 million tonnes, more than half of that being baleen whales.
So wild land mammals add up to less than 10% of humanity’s weight, about 6 lb (2.7 kg) for each person alive. Domestic dogs alone weigh about as much as every wild land mammal combined.
On the scale of all life, though, people are a rounding error. A 2018 PNAS study by Yinon Bar-On, Rob Phillips and Ron Milo put humans at about 0.06 billion tonnes of carbon, out of roughly 550 billion tonnes of carbon in all living things, most of it in plants.
About 915 billion lb, using our figure of 415 million tonnes. The 2023 Weizmann estimate of 390 million tonnes is about 860 billion lb.
Counting everyone, children included, the average is roughly 50 kg (110 lb). The average adult weighed about 62 kg (137 lb) in a 2012 study using 2005 data, ranging from 57.7 kg in Asia to 80.7 kg in North America.
Humans outweigh all wild mammals combined, about 390 million tonnes against roughly 60 million tonnes on land and at sea. They do not outweigh livestock (about 630 million tonnes), and they are a tiny fraction of all animal life, which includes insects, fish and other groups.
Yes, both because there are more people and because average body size is rising. The UN projects about 8.3 billion people in mid-2026, and a 2012 study found that US-level body sizes everywhere would add 20% to adult biomass.
Last checked October 3, 2026.
