Microscopic · #1014 biggest of 1,014
How big is a proton?
0.002 pm
A proton measures 0.002 pm. It would take roughly 58,824 of them to span an atom.
By the numbers
- That's 0.002 pm — down at the scale of individual atoms.
- You'd need about 1 quadrillion of them stacked up to reach the height of an average adult.
- About 58,824 of them would fit across an atom.
- Out of all 1,014 things in this collection, it ranks #1014 by size.
Size comparison
How proton stacks up against things of a similar size. Tap any bar to explore it.
carbon atom
1.4e+2 pm
hydrogen atom
1.0e+2 pm
helium atom
62 pm
atomic nucleus
0.010 pm
proton
0.0017 pm
Bars use a logarithmic scale so everything fits — real differences are even more extreme!
Fun fact
It's so small that about 588 billion of them would fit across a single millimeter.
More in Microscopic
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