A nanometre is one whole of a nanometre! If you want a nanometre expressed as a fraction of a metre, a mile or some other measure you need to specify what that other measure is.
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1 nanometer=1.0510-9
Nanometer is definitely smaller then a meter.
A micron is 1,000 times larger than a nanometer.
A nanometer is about one billionth of a metre (0.000000001 meters)
A nanometer is (1/1,000,000,000) of a meter, you decide