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Picometers to Nanometers Converter
↔ Convert nm to pm instead

Common Conversions

pm nm
10 0.01
50 0.05
100 0.1
121 0.121
154 0.154
200 0.2
340 0.34
500 0.5
1000 1
5000 5
10000 10

Why this conversion matters in chemistry

Picometers are the natural unit for individual bond lengths and atomic radii — the kind of numbers that fall out of a DFT geometry optimization. Nanometers are how the same chemistry gets discussed once you zoom out to particle sizes, ligand-shell thicknesses, or DNA base-pair spacings. The 154 pm C–C bond becomes 0.154 nm when you want to ask how a chain of those bonds adds up to the radius of a 5 nm gold colloid. Dividing by 1000 is the ordinary step that lets a quantum-chemistry result and a colloid-chemistry measurement land in the same units before you compare them.

Formula

nm = pm / 1000

Worked Examples

154 pm = 0.154 nm

The C–C single bond, scaled up to the units a particle chemist would use to estimate ligand chain length.

1000 pm = 1 nm

One nanometer expressed in pm — the cleanest reference point in the conversion table.

100 pm = 0.1 nm

Exactly 1 ångström — the bridge value where the older crystallographic unit, the picometer, and the nanometer all line up cleanly.

340 pm = 0.34 nm

The stacking distance between adjacent DNA base pairs, the same number you see quoted as 3.4 Å.

Frequently Asked Questions

How do I convert pm to nm?
Divide by 1000. The relationship is exact, so 154 pm becomes precisely 0.154 nm with no rounding.
How does the ångström fit in?
1 Å = 100 pm = 0.1 nm. Crystallographers and a lot of structural-biology tools still output in Å, so the same bond length might appear in three different units across three different files describing the same structure.
Why do quantum-chemistry packages report in pm?
Picometers are the SI-recommended unit at the bond scale, and DFT bond lengths come out as integers in pm rather than awkward decimals in nm. It's a presentation choice that keeps the output readable.
What are typical unit-cell dimensions in pm?
Sodium chloride is 564 pm (5.64 Å) along the cubic edge. Diamond is 357 pm (3.57 Å). Most simple binary salts and elemental solids fall somewhere between 300 and 700 pm per side.