About this calculator
A running pace calculator converts between distance, time, and pace, and can show race splits.
Who should use it: Runners planning workouts and race strategies.
When to use it: Use it when building a training pace from a goal finish time or vice versa.
Pace and speed
Enter a finish time to solve pace, or a target pace to solve finish time. Splits assume even pacing. Metric uses min/km and km/h; imperial uses min/mile and mph.
Step-by-step
Choose units and distance
Preset race or custom distance.
Pick a mode
From finish time or from desired pace.
Enter time or pace
Hours, minutes, and seconds as needed.
Review pace, speed, and splits
Use even splits as a planning baseline.
Worked example: 25-minute 5K
Metric mode, 5K race, finish time 25:00.
- Distance = 5 km
- Pace = 25:00 ÷ 5 = 5:00 /km
- Speed = 12 km/h
Pace 5:00 per km with even kilometer splits every 5:00.
How to interpret the result
Even splits assume constant pace; hills and heat usually require adjusting targets.
Key definitions
- Pace
- Time required to cover one kilometer or mile.
- Even split
- Holding approximately the same pace for every segment of the race.
- Cadence
- Steps per minute — related to form, not calculated directly here.
Common use cases
- Race planning
- Workout pacing
- Comparing km vs mile pace
Tips
- Practice goal pace in training before race day.
- Heat, hills, and crowds often slow real splits versus the even model.
- Pair pace goals with heart-rate zones for intensity control.
Common mistakes
Starting much faster than goal pace
Fix: Use the even-split plan as a ceiling for early miles.
Mixing km and mile paces
Fix: Keep unit system consistent when comparing workouts.
Limitations
- Does not model elevation, wind, or fatigue physiology.
- Not a coaching prescription.