You cannot.
A metre cubed is a measure of volume while millilitres per metre is a measure of volume per unit of length. The two measure different things and, according to basic principles of dimensional analysis, conversion from one to the other is not valid.
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divide the meter by 1000
I meter is 100 centimeters to go from centimeters cubed to meters cubes you divide by 100 cubed; so for example 1000 cubic centimeters is 1000 divided by 100 cubed or 0.001 cubic meters
You cannot convert in this way. Milliliters is a measure of liquid volume, and meters are a measure of distance. Perhaps you want to know how many milliMETERS are in a meter? If so - see related questions below.
Multiply by one thousand1 meter = 1000 millimeters
there is only one cubed meter in 1000 liters. search up meters cubed to liters and at the top should be a calculator showing the answer.