The average adult human brain weighs approximately 1.4 kilograms (kg). This is about 2% of the total body weight. However, brain weight can vary depending on factors such as age, sex, and individual differences.
Variation in Brain Weight
Studies show variations in brain weight across individuals. For example, research indicates:
- The average adult male brain weighs around 1336 grams (1.336 kg), while the average adult female brain weighs approximately 1198 grams (1.198 kg). https://pubmed.ncbi.nlm.nih.gov/8072950/
- Brain weight decreases with age, with a reported decrease of 2.7 grams per year in males. https://pubmed.ncbi.nlm.nih.gov/8072950/
It's important to note that these are average values, and individual brain weights can fall outside this range.
Brain Weight in Other Animals
For comparison, consider the brain weight of other animals:
- Elephant: The elephant brain is significantly larger, weighing between 4.5 to 5.5 kg. https://seaworld.org/animals/all-about/elephants/characteristics https://pmc.ncbi.nlm.nih.gov/articles/PMC4053853/
This information clarifies that the question "How many kg of brain?" refers to human brain weight, unless otherwise specified. The answer provided reflects the average adult human brain weight.
