Pace Calculator
Convert between running pace, time, and distance.
This pace calculator converts between the three variables every runner juggles: distance, time, and pace. Enter any two of the three — say, a target finish time and a race distance — and it solves for the third, whether you need minutes per kilometre, minutes per mile, or an equivalent speed in km/h.
Pace discipline is often the single biggest difference between a race that goes to plan and one that falls apart in the final kilometres. Knowing your target pace in advance, and checking it against real split times during training, turns a goal finish time from a hope into a plan you can actually execute.
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The Core Pace Formula
Pace is simply time divided by distance: Pace (min/km) = Total time (minutes) ÷ Distance (km). Rearranged, Total time = Pace × Distance, and Distance = Total time ÷ Pace — the calculator solves whichever variable you leave blank.
To convert pace into speed, divide 60 by your minutes-per-kilometre figure: Speed (km/h) = 60 ÷ Pace (min/km). For example, a pace of 5:00 min/km equals 60 ÷ 5 = 12 km/h.
A Worked Example: Planning a 10K
Say you want to finish a 10 km race in 55 minutes. Pace = 55 ÷ 10 = 5.5 minutes per kilometre, which is 5 minutes 30 seconds per kilometre. Converting to speed: 60 ÷ 5.5 ≈ 10.9 km/h.
Knowing that 5:30/km split, you can check your watch at each kilometre marker during the race and adjust immediately if you drift too fast (risking an early fade) or too slow (leaving time on the table for a strong finish).
Pace, Splits, and Race Strategy
Many experienced runners aim for even or slightly negative splits — running the second half of a race at the same pace as, or marginally faster than, the first half — because starting conservatively preserves glycogen and reduces the risk of a late-race collapse.
- Even splits: same pace throughout, easiest to plan and pace mentally.
- Negative splits: second half faster than first, common strategy among competitive marathoners.
- Positive splits: second half slower than first, usually a sign of starting too aggressively.
Heat, humidity, wind, and hills all convert the same physical effort into a slower pace, so adjust your target on tough courses or hot days rather than chasing a flat-course number no matter the conditions.
Using Pace for Interval Training
Track workouts such as 400 m or 800 m repeats are usually prescribed relative to a goal race pace — for example, "5K pace minus 5 seconds per 400 m." Calculating your target race pace first, using this tool, makes it easy to work backward to accurate per-lap splits for structured sessions.
Always separate warm-up, drills, and cool-down from the "work" pace of the session; the calculated pace applies only to the effort intervals, not the full outing.
Pacing by Effort When Numbers Cannot Be Trusted
GPS watches lose accuracy under tree cover, in urban canyons between tall buildings, and on tightly winding trails, which can make a displayed pace unreliable exactly when you need it most. Rate of perceived exertion (RPE), a simple 1-to-10 self-assessment of how hard an effort feels, is a useful backup pacing tool that does not depend on satellite signal or calibration.
Experienced runners often train themselves to recognise specific paces by feel — easy conversational effort, moderate tempo effort, and hard interval effort — precisely so that a lost GPS signal or an unfamiliar course does not derail an entire session or race.
If your race is listed in miles but you train in kilometres (or the reverse), the Conversion Calculator handles the distance switch before you plug numbers in here. For fueling and recovery around long training weeks, the Calorie Calculator helps estimate how much extra daily energy those harder sessions actually cost.