What are the sources for pace calculations?

The half marathon is 21.0975 km (13.1094 miles) on the World Athletics half marathon page, https://worldathletics.org/disciplines/road-running/half-marathon. The marathon is 42.195 km (26 miles 385 yards) on the World Athletics marathon page, https://worldathletics.org/disciplines/road/marathon. The mile is 1,609.344 m, the international mile in NIST Special Publication 811, https://www.nist.gov/pml/special-publication-811. Pace itself is time divided by distance.

Pace Calculator

Minutes per mile, or a race time for 5K, 10K, half, marathon, or a custom distance. An estimate, not a diagnosis.

Custom distance and pace

Smart Tips

• Pace is finish time divided by distance. Race time is pace multiplied by distance.

• 5K and 10K are 5,000 m and 10,000 m. The half marathon is 21.0975 km. The marathon is 42.195 km.

• The mile used for minutes per mile is 1,609.344 m.

• The unit switch changes a custom distance and whether the pace you type is per mile or per kilometer. The hero stays minutes per mile.

• This page does not predict a marathon from a 5K, and it does not build a training plan.

• A pace is not cardiac clearance. Stop if you have chest pain.

The Formula

min/mile = time ÷ (distance in meters / 1,609.344)
race time = min/mile × (distance in meters / 1,609.344)

5K 5,000 meters
Exact metric distance

10K 10,000 meters
Exact metric distance

Half 21.0975 km
World Athletics, 13.1094 miles

Marathon 42.195 km
World Athletics, 26 miles 385 yards

One mile is 1,609.344 meters (63,360 × 0.0254 m). A 5K in 25:00 is 482.8032 seconds per mile, which displays as 8:03.

Key Insights

Two modes, one page

Finish time to pace, or pace to race time. The presets are 5K, 10K, half, marathon, and a custom distance.

Minutes per mile stay visible

The hero is always minutes per mile. Minutes per kilometer and the race clock sit beside it.

Not a predictor

The page does not scale one race onto another. It does not use a fatigue exponent, and it is not a training plan.

Official road distances

The half marathon and marathon meters are the World Athletics distances, not a rounded 13.1 or 26.2.

Medical Disclaimer

Estimate only: This page is an estimate, not a diagnosis, a lab test, or a treatment plan.

Not a training plan: A pace is clock arithmetic. It is not a workout, a heart-rate zone, or clearance to race.

Frequently Asked Questions

Minutes per mile are the finish time divided by the distance in miles. Miles are meters divided by 1,609.344. Minutes per kilometer are the same time divided by the distance in kilometers.

5K is 5,000 meters. 10K is 10,000 meters. The half marathon is 21.0975 kilometers. The marathon is 42.195 kilometers. Custom accepts miles or kilometers from the unit switch.

You enter a pace and a distance. The page multiplies them. It does not predict a different race from a result you already have, and it does not write a training plan.

Five kilometers is shorter than 3.2 miles. 1,500 seconds times 1,609.344 divided by 5,000 is 482.8032 seconds per mile, which is 8:03 when rounded to the nearest second.

The speed calculator reports miles per hour or kilometers per hour. This page reports minutes per mile and a race clock. They answer different questions.

The half marathon is 21.0975 km (13.1094 miles) on the World Athletics half marathon page. The marathon is 42.195 km (26 miles 385 yards) on the World Athletics marathon page. The mile is 1,609.344 m, the international mile in NIST Special Publication 811. Pace itself is time divided by distance.

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Note:Pace is time divided by distance. Race distances are 5,000 m, 10,000 m, 21.0975 km, and 42.195 km. This is an estimate, not a diagnosis or a training plan.