Marathon Pace Calculator

Race pace is total running time in minutes divided by distance in kilometres or miles. A full marathon is 42.195 km (26.2188 miles) and a half is exactly half that, so the arithmetic is straight division once both inputs are in consistent units. The calculator accepts minutes and seconds separately to preserve precision — a 3:30:00 marathon is 210 minutes, or about 4:58 per kilometre and 8:00 per mile.

Steady pace here is the even-split baseline; race strategy often deviates with negative splits where the second half is run slightly faster to conserve early glycogen and manage heat. Track your training paces at this effort, then add 2–4% for marathon distance if extrapolating from a half, because fatigue imposes a real physiological penalty beyond 30 km.