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10K in 50 Minutes: Pace per KM and Mile

Calculate your running pace per km and per mile, finish time and km splits, or predict race times with the Riegel formula — right in your browser.

Processing... 0%
Reading race data
Calculating pace and speed
Building split table

Result

This page opens the running pace calculator with a 10K in 50:00 already filled in: the required pace is 5:00 per kilometer, which equals 8:03 per mile or a steady 12.0 km/h (7.5 mph).

A sub-50 10K means holding the same pace as a 25-minute 5K, but twice as long — a solid amateur benchmark that usually follows months of structured tempo and interval work. The table lists all ten kilometer marks so you can check yourself against 5:00, 10:00, 15:00 and every split up to 50:00.

Use the predictor mode with this result to estimate your half marathon (around 1:50) and marathon potential, or lower the time to see what a sub-45 10K requires.

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Accepted Formats & Rules

  • Pace mode: distance + time gives pace per km, pace per mile, speed and km splits
  • Time mode: distance + target pace gives your projected finish time
  • Predictor mode: one known race result forecasts 5K, 10K, half and marathon times with Riegel's T2 = T1 × (D2/D1)^1.06

Key Benefits

✓ Three calculators in one: pace from a race result, finish time from a target pace, and Riegel race-time predictions.
✓ Metric and imperial at once: every pace is shown in min/km and min/mile, every speed in km/h and mph.
✓ A ready split table for your distance, so you know exactly what the clock should show at every kilometer mark.

Use Cases

  • • Signed up for a 10K and want to know what pace gets you across the line in under 50 minutes?
  • • Need km-by-km split times written on your hand for Sunday's half marathon?
  • • Wondering what marathon time your latest 10K result predicts?