Pace Calculator

Pace Calculator

Calculate any one of pace, time, or distance given the other two. Projects finish times for common race distances.

Capabilities

• Three-way solve: Provide any two of distance, time, and pace — the tool computes the third.
• Race splits: Projected finish times for 5K, 10K, half marathon (13.1 mi / 21.1 km), and marathon (26.2 mi / 42.2 km).
• Unit support: Works in miles or kilometers for distance and pace.
• Time formatting: Input and output in hours:minutes:seconds.

Gotchas

• Provide exactly two inputs: If all three are given, pace is recalculated from distance and time (time+distance take priority).
• Pace is per-unit: Pace is expressed as minutes:seconds per mile or per kilometer, matching the distance_unit.
• Race splits assume constant pace: Projected times don't account for fatigue, hills, or pacing strategy.