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General estimate for planning only — not medical advice. Consult a doctor about your specific situation.
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What does this calculator estimate?
The pace calculator computes your running pace per km and per mile from a distance and time, shows your speed, and projects finish times for common race distances.
Pace, speed, and distance
Pace is how long it takes to cover one unit of distance (minutes per km or mile), while speed is how far you travel per unit of time. They are reciprocals: a 6:00 min/km pace equals 10 km/h. Runners usually talk in pace, cyclists in speed, but both are useful.
Predicting race times
If you know your comfortable pace, you can estimate a finish time for any race distance by multiplying the pace by the distance. These projections assume you hold the pace for the whole race, so real times often differ — negative splits, hills, and weather all matter.
Improving your pace
Consistent training, intervals, and tempo runs build the endurance and speed that lower your average pace. Tracking pace over the same route or distance is a reliable way to measure improvement without over-interpreting a single run.
How this calculator works
Formula
Pace per unit distance = total time ÷ distance. Speed = distance ÷ time. This calculator takes a distance and a time, computes the pace in minutes per km and per mile, and projects race times assuming a constant pace.
Worked example
Running 5 km in 30 minutes gives a pace of 6:00 per kilometer (about 9:39 per mile) and a speed of 10 km/h. At that pace, a projected marathon time is about 4 hours 13 minutes.
Assumptions to verify
- Pace is assumed constant over the distance; real efforts vary with terrain and conditions.
- Distances use the standard values for each race distance.
- Time can be entered in hours, minutes, and seconds.
- This tool provides general estimates for planning and education only; it is not medical advice and not a substitute for a qualified healthcare professional.
- Always consult your doctor or another healthcare provider about your specific situation.
Frequently asked questions
How do I calculate my running pace?
Divide your total time by the distance. For 5 km in 30 minutes, that is 30 ÷ 5 = 6 minutes per km (about 9:39 per mile).
What is a good running pace?
A good pace is highly individual and depends on fitness and distance. The calculator projects race times from your pace so you can compare against typical benchmarks for your age and experience.
How do I convert pace to speed?
Speed is the inverse of pace: distance ÷ time. A 6:00 min/km pace is 10 km/h, or about 6.2 mph.
How is a marathon finish time predicted?
Multiply your per-km pace by 42.195 km. At 6:00 min/km that gives about 4 hours 13 minutes. It assumes you maintain that exact pace.
Does pace calculator work for walking or cycling?
Yes — enter any distance and time and it returns the pace and speed for that activity.
Cite this tool
BoringToolsKit. “Pace Calculator.” boringtoolskit.com/pace-calculator/ (reviewed August 2026). Free to reference in articles, syllabi, and answer posts with a link.
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