Running

Estimate your marathon finish time from a recent half-marathon performance using Riegel's formula.

Convert running pace between minutes per mile and minutes per kilometer instantly.

Estimate race finish time at a new distance using the Riegel formula and a known performance.

Calculate average running pace, speed, and split times from distance and duration.

Estimate running fitness (VDOT) from race performance using Jack Daniels's Running Formula equations.

Express any race result as a percentage of a reference standard using the WMA ratio formula.

Estimate time cost of vertical gain using the 12 s/mile per 100 ft coaching heuristic.

Convert a marathon goal time into per-kilometer pace and checkpoint splits for race-day pacing.

Calculate average steps per minute from total step count and run duration.

Break your run into equal splits and see the cumulative time at each distance marker.

Calculate Easy, Marathon, Threshold, and Interval paces from your VDOT score using Daniels' formula.

Convert treadmill speed in mph to running pace in minutes per mile and minutes per kilometer.

Split your race time into a slower first half and faster second half with adjustable pace gaps.

Estimate running power in watts from body weight and pace using a Stryd-style metabolic coefficient.

Calculate stride length from distance and step count using biomechanical gait-cycle definitions.