5K Pace Calculator — calculate 5k pace for training and performance. Evidence-based formula and benchmarks.
This page predicts a 5K finish time from a recent race or time trial and opens with the target fixed at 5 kilometres. The headline prediction and target pace belong to the 5K; the distance and finish time you enter describe the known performance used to estimate it.
A race-equivalence model can help translate one result into a training reference, but it cannot know the runner's preparation, terrain, weather, pacing, or fatigue. A 5K prediction based on a 10K effort is a different kind of estimate from a target based on a short interval session.
For training context across distances, compare this result with Running Pace Calculator and 10K Pace Calculator. Use equivalent units and comparable effort conditions when reviewing pace across distances.
Use a completed effort that was measured reliably and is recent enough to reflect current fitness.
The default sample is a 25-minute 5K, which is only a worked starting example and not a benchmark for ability.
The widget uses the Riegel relationship: target time = known time × (target distance ÷ known distance)^1.06. For this calculator the target distance is always 5 km. Target pace per kilometre divides the predicted seconds by 5; pace per mile converts the same target duration to a 5K distance in miles.
If a runner covers 10 km in 50 minutes, the model predicts approximately 24 minutes 11 seconds for 5K using the 1.06 exponent. The estimate is not a direct conversion from average pace; it assumes the longer performance can be projected through a standard endurance-decay curve.
The time is a modelled finish, rounded to whole seconds, while the pace rows divide that same target time across kilometres or miles. These values are internally linked: changing the source distance or source time changes both the headline finish and the target pace.
Use the estimate to plan a controlled benchmark or compare race-equivalent performances, not to promise a result on race day. A runner whose speed work is stronger than endurance may outperform the simple curve over 5K; another runner may need more recovery or aerobic preparation.
A measured road or track race is usually a better input than a treadmill session with uncertain calibration. Record whether the course was certified, the route was hilly, and whether the time came from gun time or chip time.
For training, treat the target pace as a starting range rather than a command to run every workout at that speed. Easy days, recovery, and the session's purpose still matter, and the calculator does not prescribe a training plan.
If your source effort was run on a track, use the measured distance rather than the watch's rounded GPS display. A small distance error changes the ratio raised to the 1.06 power and therefore shifts both predicted time and pace.
A prediction can be more useful as a consistency check than as a precise goal. Compare its pace with recent workouts, then note whether those sessions were controlled, threshold, or interval work instead of treating every training speed as equivalent.
For a useful comparison, save the source event, date, weather, and the exact time used. If the next estimate comes from a different kind of effort, label the source change; otherwise an apparent improvement may reflect input selection rather than new fitness.
The fixed target is 5 km, or about 3.107 miles. A pace per mile therefore represents the same predicted finish time divided by 3.107, whereas pace per kilometre divides it by 5; the two pace values should not be confused with different predictions.
When the source distance is also 5 km, the distance ratio is one and any positive exponent leaves the time unchanged. That identity is a useful check that the page is using the entered performance as the baseline rather than silently swapping its target.
Do not enter the target's predicted result as the source performance and then interpret the unchanged 5K output as independent evidence. The calculator needs an observed time and distance; the prediction is derived from those inputs.
Avoid entering a split or interval as if it were an all-out race without noting its context. A fast kilometre inside a workout includes neither the pacing nor the sustained effort pattern required to establish 5K endurance.
Do not compare a 5K run on a short course or a downhill route with a standard-distance result without labeling the conditions. The equation assumes the source distance is accurate and contains no correction for course measurement or elevation.
This is a general race-equivalence estimate, not medical advice or an individualized training prescription. Stop exercise for concerning symptoms and consult an appropriate professional about health or training decisions.