Running pace
Distance + time → pace, speed and split times.
- Instant
- Free
- Private (processed locally)
- No sign-up
Your race plan, quantified kilometre by kilometre
“I want to run 10K in 50 minutes” — fine, but what pace is that? 5:00 min/km, i.e. 12 km/h, passing the 5th kilometre at 25:00. This tool turns a target time into a concrete plan to follow on your watch.
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Pick the distance
5K, 10K, half, marathon or a custom distance.
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Enter your target time
Hours, minutes, seconds.
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Read pace, speed and splits
Everything recalculates instantly.
Reference splits for a 4-hour marathon
| Checkpoint | Time |
|---|---|
| Km 10 | 56:53 |
| Half (21.1 km) | 2:00:00 |
| Km 30 | 2:50:38 |
| Finish (42.2 km) | 4:00:00 |
Target pace should feel “comfortably hard”: if you cannot speak a short sentence at your target marathon pace, it is too ambitious for race day.
Frequently asked questions
Pace vs speed: what’s the difference?
Pace is time per kilometre (5:00 min/km); speed is distance per hour (12 km/h). Runners think in pace (readable on the watch every km), treadmills and bikes in speed. Conversion: speed = 60 ÷ pace in minutes.
What are split times for?
To hold your race plan: if you target 4 h for the marathon, you must pass halfway at 2:00:00 and km 30 at 2:50:38. Going out 5% too fast at the start often costs a collapse in the final 10 kilometres.
What is a “good” 10K time?
Common benchmarks: under 60 min (6:00/km) = good recreational level, under 50 min (5:00/km) = regular runner, under 45 min = seasoned athlete, under 40 min (4:00/km) = excellent amateur level.
How do I estimate my marathon time from a 10K?
Riegel’s formula multiplies by (42.195/10)^1.06 ≈ 4.6: a 50-minute 10K suggests a marathon around 3 h 50 — provided you have done the corresponding endurance training. The marathon does not forgive optimistic extrapolation.