Give it any two of pace, finish time and distance and the third appears immediately. It also converts that pace into a treadmill speed, prints a cumulative split table for every kilometre or mile, and predicts your times at other race distances using Riegel's formula.
The split table assumes an even pace throughout. In practice, starting the first kilometre 5–10 seconds slower than target usually costs you less than fading in the closing stages.
Type the treadmill number straight into the machine's speed control — 5:00/km is 12.0 km/h, for example. Most treadmills step in 0.1 increments, which is why it is rounded to one decimal.
They use Riegel's formula with an exponent of 1.06. Predictions between nearby distances (5K to 10K) hold up well, but a marathon predicted from a 5K is usually optimistic — long races depend far more on endurance training volume.
They are the same thing inverted. Pace is minutes per kilometre; speed is kilometres per hour. Outdoor runners usually talk in pace, treadmills in speed.
No. Switching units converts the same distance into that unit — 10 km becomes 6.21 miles and every result stays the same.