Divide mm by 304.8 to convert to feet.
120 mm = 0.39 feet.120 mm = 0.39 feet.120 mm = 0.39 feet.120 mm = 0.39 feet.
1 m = 3.28 feet 1 mm = .00328 feet 2600 mm = 8.53 feet
1 mm = 0.00328 feet so 30 mm = 30*0.00328 feet = 0.0984 feet
About 0.00328 feet per mm
3500 mm = 11.48 feet.
120 mm = 0.39 feet.120 mm = 0.39 feet.120 mm = 0.39 feet.120 mm = 0.39 feet.
1 m = 3.28 feet 1 mm = .00328 feet 2600 mm = 8.53 feet
432 mm is 1.41732 feet.
940 mm is 3.08399 feet.
Without knowledge of the material you cannot.
1 mm = 0.00328 feet so 30 mm = 30*0.00328 feet = 0.0984 feet
About 0.00328 feet per mm
121 mm is 0.396982 feet.
637 mm is 2.0899 feet.
820 mm is 2.69029 feet.
1690 mm is 5.544619 feet.
700 mm is 2.29659 feet.