Petameter to Picometer

The picometer is a unit of length equal to 10⁻¹² meters, or one trillionth of a meter.

1 pm = 10⁻¹² m = 0.01 Å = 1,000 fm. One nanometer equals 1,000 picometers.

To convert pm to meters: multiply by 10⁻¹². To convert pm to angstroms: divide by 100.

Expressing covalent bond lengths (e.g., C–C bond ≈ 154 pm), atomic radii, and crystal lattice spacings.

The hydrogen atom has a radius of about 53 pm (the Bohr radius), while a carbon-carbon single bond is about 154 pm long.

Mixing up picometers and nanometers — remember 1 nm = 1,000 pm. Some sources still use the deprecated angstrom.

Think of pm as the natural unit for atoms: most atomic radii fall between 30 pm and 300 pm.