Mass1.4 kg
4.7 tenthsLabrador puppies
122AAA batteries
1.2 hundredthsDwayne The Rock Johnson weights
Average adult brain
Photo from Wikimedia Commons
Human Brain
1.4 kg of the universe trying to understand itself/The Human Body
The adult human brain weighs about 1.4 kg and occupies roughly 1,400 mL. Despite being only 2% of body mass, it consumes about 20% of the body's energy, around 20 watts at rest. It contains approximately 86 billion neurons, each connected to thousands of others, forming a network of roughly 100 trillion synapses. It runs at 37.3°C and never gets a day off.
Measurements
Volume1.4 thousandths m³
4Coffee mugs
33.4 quadrillionthsGrand Canyons
41.8Ping pong balls
About 1,400 mL
Power consumption20 W
2.5 tenthsResting humans
1 hundredthsPressure washers
2.5 tenthsResting human bodies
About 20% of the body's resting energy budget
Brain temperature310 K
9 tenthsCar dashboards in summer
6.6 tenthsBread ovens
1.08Hardwood floors
37.3°C; slightly above core body temp
Length (front to back)1.7 tenths m
167 millionNanometers
3.9 hundredthsTrampoline diameters
Average anterior-posterior length
Width1.4 tenths m
5.6Cherry tomatoes
3.11Matchsticks
5.8 tenthsEnvelope lengths
Average lateral width
Cortical surface area (unfolded)2.5 tenths m²
6 hundredthsPing pong tables
2.4 hundredthsTrampoline surfaces
About the size of 2.5 pages of newspaper
Daily energy consumption1.7 million J
27.4 billionthsHiroshima blasts
51.6 octillionthsSun daily outputs
17.3 quintillionGamma ray photons
About 400-500 kcal per day; ~86 billion neurons with ~100 trillion synapses