You can easily convert 1000 millimeters into feet using each unit definition:
With this information, you can calculate the quantity of feet 1000 millimeters is equal to.
In 1000 mm there are 3.2808399 ft.
Which is the same to say that 1000 millimeters is 3.2808399 feet.
One thousand millimeters equals to three feet. *Approximation
Performing the inverse calculation of the relationship between units, we obtain that 1 foot is 0.3048 times 1000 millimeters.
A foot is zero times one thousand millimeters. *Approximation