Pace is the language of running. Whether you are training for your first 5K or chasing a marathon PR, knowing your pace — and what it predicts for other distances — is one of the most useful pieces of data a runner can have. This calculator works three ways: find your pace, predict your finish time, or calculate how far you ran.

The number on the cardio machine is almost certainly wrong. Treadmills, ellipticals, and stationary bikes consistently overestimate calorie burn — sometimes by 30 percent or more — because they do not account for your body weight, fitness level, or actual effort. This workout calorie calculator gives you a more accurate estimate.

Starting an exercise habit is hard. Not because the exercises themselves are hard, but because the habit does not exist yet. There is no groove worn into your daily routine, no automatic pull toward movement, no identity of “someone who exercises.” The 30-day starter plan is designed to build that groove, one small step at a time.