km to nm Converter - Kilometer to Nanometer

Kilometer (km) to Nanometer (nm)

Direct answer

1 km = 1e+12 nm

nm = km × 1e+12

Converter

Input

Result

1e+12nm

nm = km × 1e+12

km = nm × 1e-12

Example: 10 km = 10 × 1e+12 = 1e+13 nm.

Express both km and nm in the same base unit m (meter), then cancel the shared base unit.

1
Rewrite km in the base unit
$1 km = 1, 000 m$
2
Rewrite nm in the base unit
$1 nm = 1 \times 1 0^{- 9} m$
3
Forward conversion
$1 km = \frac{1 , 000 m}{1 \times 1 0 ^{- 9} m} \times 1 nm = \frac{1 , 000}{1 \times 1 0 ^{- 9}} nm = 1 \times 1 0^{12} nm$
4
Reverse conversion
$1 nm = \frac{1 \times 1 0 ^{- 9} m}{1 , 000 m} \times 1 km = \frac{1 \times 1 0 ^{- 9}}{1 , 000} km = 1 \times 1 0^{- 12} km$

A guarded explanation for this pair page covering definition, principle, assumptions, and cautions.

Guarded output

AI text is for interpretation only. The page calculator remains the source of truth for numeric results.

1 km = 1e+12 nm.

10 km = 1e+13 nm.

100 km = 1e+14 nm.

Use nm = km × 1e+12.

1 nm = 1e-12 km.

Use the conversion factor and round the result to the precision required by your calculation.