How it works
required pace = goal time ÷ 3.10686 mi (or ÷ 5 km)
Average pace is elapsed time divided by distance — the kinematic definition of speed, expressed as time per unit. For a 5K the distance is fixed at exactly 5,000 m, so the only variable is your goal time. We compute everything in SI units (metres and seconds) internally and convert to miles or kilometres only at the display edge, so both unit views are always consistent (ADR-9). The 1 km split assumes perfectly even pacing — each kilometre takes the same time. Because a 5K is only 12.5 track laps, the race is short enough to forgive a brief surge: many runners hold the even-pace target through 4 km and then close hard over the final lap or two, where a few seconds gained costs little in fatigue.
Sources
- 5 km road race distance World Athletics — the 5 km road race is defined as 5,000 metres (5 km). It is one of the most common recreational race distances worldwide.
- Definition of average pace Average speed = distance ÷ time (kinematics); pace is its inverse, expressed as time per unit distance. Halliday, Resnick & Krane, "Physics", 4th ed., §2-2.
- Even pacing and energy efficiency Riegel, P. S. (1981). "Athletic Records and Human Endurance." American Scientist 69(3), 285–290. Even-pace or slight negative-split strategies minimise energy cost over shorter road events such as 5 km.
FAQ
What pace do I need to run a sub-25 minute 5K?
To finish a 5K in under 25:00 you must average faster than 8:03 per mile (5:00 per km). That is exactly 5 minutes per kilometre — a clean benchmark for recreational runners.
What pace do I need for a sub-20 minute 5K?
A sub-20 minute 5K requires holding 6:26 per mile (4:00 per km). Each kilometre must pass in under 4 minutes and each 400 m lap in under 1:36. This is a competitive amateur milestone.
What pace do I need for a sub-30 minute 5K?
Under 30 minutes means averaging faster than 9:39 per mile (6:00 per km). At that pace each kilometre passes in exactly 6 minutes — a popular beginner goal after completing a 5K program.
How do miles and kilometre paces relate at 5K?
One mile is 1.609344 km, so the per-mile figure is always the larger number for the same effort. At 5K this matters because most road 5Ks mark kilometres while track and treadmill workouts count miles or laps — a sub-25 5K, for instance, is 5:00 per km but 8:03 per mile. This calculator shows both so a kilometre course marker and a mile-based watch never disagree.
Why is my per-400 m time useful for a 5K?
A standard outdoor track lap is 400 m and a 5K is exactly 12.5 laps. The per-400 m figure tells you your target lap time at 5K pace — perfect for track workouts and tempo intervals where you can check effort every lap.
What is a good 5K time for a beginner?
A good beginner target is 30–35 minutes (9:39–11:16 per mile, or 6:00–7:00 per km). Most runners who complete a Couch-to-5K program finish in that range. From there, targeting sub-30, sub-25, and eventually sub-20 are natural progressions.
How accurate is the even-pace 1 km split?
The split assumes perfectly even pace across the full 5,000 m. Real races vary by course profile and weather, and runners often go out faster in the first kilometre. Use the even-pace split as your target ceiling and plan to run the first kilometre 5–10 seconds slower to avoid burning out.
Pace figures are mathematically exact for the goal time you enter. The 1 km split assumes perfectly even pace and is not a personalised prediction. General information for planning purposes only — not medical, coaching, or race-strategy advice.