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CalcSpectrum

Pace Calculator

Calculate your running pace per kilometer and per mile, plus speed in km/h and mph, from a distance and elapsed time.

Free to use · Instant results

Calculator Inputs

Enter the distance covered, matching the unit selected below.

Enter total elapsed time in minutes (decimals allowed, e.g. 27.5 for 27:30).

Pace (min/km)
5:00
Pace (min/mile)
8:03
Speed (km/h)
12.00
Speed (mph)
7.46
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About these results

CalcSpectrum calculators produce automated estimates using established formulas and the specific values you enter. Because real-world outcomes depend on input accuracy, mathematical assumptions, and rounding conventions, please verify critical figures with an appropriately qualified financial, tax, medical, legal, or other professional, as relevant.

Health & Fitness Notice: Wellness and body metric calculations provide informational estimates based on generalized population formulas. They do not provide medical diagnosis, clinical advice, or treatment plans. Consult an appropriately qualified medical or healthcare professional for personal guidance.

How It's Calculated

Formula

pace (s/km)=elapsed time (s)distance (km)speed (km/h)=distance (km)elapsed time (h)\text{pace (s/km)} = \frac{\text{elapsed time (s)}}{\text{distance (km)}} \text{speed (km/h)} = \frac{\text{distance (km)}}{\text{elapsed time (h)}}

This calculator converts a distance and elapsed time into running pace (minutes per kilometer and minutes per mile) and speed (km/h and mph). Pace is simply elapsed time divided by distance; speed is distance divided by elapsed time — the two are reciprocals of each other, just expressed in different units. Distance-unit conversion (km <-> mile) uses the same exact 1609.344 m/mile constant as this site's Length Converter, so pace-per-km and pace-per-mile always describe the exact same run. This is an estimate for general informational and educational purposes, based on a published formula — it is not a medical diagnosis, and it is not a substitute for individualized advice from a qualified healthcare provider. This is pure performance math — it does not account for terrain, elevation, weather, or pacing strategy across the distance.

Worked Examples

5 km in 25 minutes

  1. Elapsed time: 25 min = 1,500 s
  2. Pace per km: 1,500 s / 5 km = 300 s/km = 5:00 / km
  3. Pace per mile: 300 s/km × 1.609344 km/mile ≈ 482.8 s/mile ≈ 8:03 / mile
  4. Speed: 5 km / (25/60 h) = 12 km/h

10 km in 60 minutes

  1. Elapsed time: 60 min = 3,600 s
  2. Pace per km: 3,600 s / 10 km = 360 s/km = 6:00 / km
  3. Speed: 10 km / 1 h = 10 km/h

Frequently Asked Questions

How is pace different from speed?

Pace is time per unit distance (e.g. minutes per km) — lower is faster. Speed is distance per unit time (e.g. km/h) — higher is faster. They're mathematically reciprocal descriptions of the same run.

Why do pace-per-km and pace-per-mile look different for the same run?

A mile (1.609344 km) is longer than a kilometer, so covering it takes proportionally longer — pace-per-mile is always pace-per-km multiplied by 1.609344, not a different run.

Can I enter fractional minutes and seconds?

Yes. Enter elapsed time as decimal minutes — for example, 27 minutes 30 seconds is 27.5.