There are 1000 nanometres in one millimetre.
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1 millimetre = 1 million nanometres.
1 micrometre = 1000 nanometres so 1 sq micrometre = 1000*1000 sq nanometres or 1 million sq nanometres.
1 millimetre = 1,000,000 nanometres. To convert a value in millimetres to nanometres, multiply by 1,000,000
1 micrometre = 1000 nanometres so 300 micrometres = 300 000 nanometres. Simple!
One millimeter is 0.000001km