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Running Pace Calculator

Calculate running pace, speed, and finish times. Get race predictions for 5K, 10K, half marathon, and marathon distances.

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Running Calculator

Results

Pace /km

5:00

Pace /mile

8:03

Speed

12.0 km/h

7.5 mph

Distance

5.0 km

3.1 mi

Time

25:00

Race Predictions

5K25:00
10K50:00
Half Marathon1:45:29
Marathon3:30:59
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How to Use Running Pace Calculator

  1. 1

    Choose mode

    Calculate pace from time, finish time from pace, or distance from time and pace.

  2. 2

    Enter distance

    Select a preset distance (5K, 10K, half/full marathon) or enter a custom distance.

  3. 3

    Enter time or pace

    Enter your known time or pace values.

  4. 4

    View results

    See pace per km and mile, speed, and race predictions.

Frequently Asked Questions

For beginners, 10-12 min/mile (6:13-7:27 min/km) is typical. Intermediate runners average 8-10 min/mile. Competitive runners aim for under 7 min/mile. Pace varies by age, fitness, and conditions.

Pace = total time / distance. For example, a 5K in 25 minutes = 25/3.1 = 8:04 min/mile, or 25/5 = 5:00 min/km.

5K = 3.1 miles, 10K = 6.2 miles, Half Marathon = 13.1 miles (21.1 km), Marathon = 26.2 miles (42.2 km). Each roughly doubles the distance and more than doubles the challenge.

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Understanding Running Pace and Performance

Running pace (minutes per mile or kilometer) is the most practical metric for training because it directly tells you how fast to run. Speed (mph or km/h) is the same information inverted but less intuitive for runners. A 10:00 min/mile pace equals 6.0 mph. Importantly, the relationship is not linear: improving from 10:00 to 9:00 min/mile is a 10% improvement, but from 6:00 to 5:00 requires a 17% improvement in speed — each minute faster gets exponentially harder.

Race Prediction and the "Fade Factor"

Doubling the race distance more than doubles the finish time because fatigue accumulates non-linearly. A runner who finishes a 5K in 25 minutes will not run a 10K in 50 minutes — a realistic prediction is closer to 52-53 minutes. Marathon time is roughly 4.6x the 10K time, not 4.2x. These prediction formulas use the Riegel formula (T2 = T1 x (D2/D1)^1.06), where the 1.06 exponent captures the fatigue factor.

Pacing Strategy for Race Day

Negative splits — running the second half faster than the first — produce the best race results for most runners. Starting too fast causes early glycogen depletion and forces you to slow dramatically in the final miles. Elite marathoners typically run the first half only 1-2% slower than the second half. For recreational runners, even splits (consistent pace throughout) are a more realistic and effective target than chasing negative splits.