Millimeter per Second to Foot per Hour

Millimeter per second measures distance in millimeters traveled in one second. Used for small-scale movements and precise measurements.

1 mm/s = 0.001 m/s = 0.0036 km/h = 0.06 m/min.

To m/s: ÷ 1,000. To cm/s: ÷ 10. To km/h: × 0.0036.

Vibration measurements (machinery typically 0.1–50 mm/s RMS), small motor speeds, precision linear actuators, and tape/film transport speeds.

Machinery vibration: >10 mm/s indicates problems. Seismic activity: 0.001–100 mm/s. CD/DVD read head: 1.2–1.4 mm/s linear velocity.

Confusing mm/s with cm/s (10× different) or m/s (1000× different).

1,000 mm/s = 1 m/s. Very common in vibration analysis. 10 mm/s RMS is a typical machinery vibration threshold.

Foot per hour measures distance in feet traveled over one hour. Used for very slow movements in imperial units.

1 ft/h = 0.000085 m/s = 0.0003048 km/h = 0.3048 m/h.

To ft/s: ÷ 3,600. To mph: ÷ 5,280. To m/s: × 0.000085.

Glacier movement in US studies, very slow industrial processes, and some geological measurements.

Some glaciers move at 50–500 ft/h. Very slow conveyor systems might use this unit.

Confusing with ft/min (60× faster) or ft/s (3,600× faster).

5,280 ft/h = 1 mph. Extremely slow. Rarely used outside specialized contexts.