Running pace • speed • finish time • splits
Running Pace & Split Calculator
Convert distance and time into pace and speed—or start from pace or speed to estimate finish time. Build kilometer or mile splits for 5K, 10K, half marathon, marathon, one-mile and custom-distance runs.
min/km & min/mikm/h & mphKM or mile splitsPHP fallback
Example5K in 25:00
Pace5:00 / km
Speed12.0 km/h
Every full kilometer split is 5:00 at even pace.
Free running calculator
Calculate pace, speed, finish time and splits
Select what you already know, then enter the distance. The calculator normalizes every route to meters internally and returns both metric and imperial running metrics.
- Use Elapsed time after a completed run or race.
- Use Pace when planning a target finish.
- Use Speed for treadmill or speed-based sessions.
Your running result
Pace, speed and finish-time summary
Equivalent metrics are calculated from one normalized distance and elapsed time.
Enter your run details above.Your pace, speed, finish time and split table will appear here.
Even-pace split plan
Kilometer splits
Each row assumes the same average pace from start to finish.
| Split | Segment | Segment time | Cumulative |
|---|
Running math
How pace, speed and finish time relate
All three values describe the same performance from different angles. This calculator converts the inputs to meters and seconds first so metric and imperial results stay consistent.
pace = elapsed time ÷ distanceShown as minutes per kilometer and minutes per mile.
speed = distance ÷ elapsed timeShown as kilometers per hour and miles per hour.
time = pace × distanceUseful when you know your target pace and race distance.
Common race distances
Built-in running distance presets
Use a preset or switch to a custom distance for training routes, track sessions and non-standard events.
Practical running use
Use splits as a pacing reference, not a guarantee
Even splits are useful for planning, but terrain, weather, aid stations, elevation, fatigue and race tactics can change real-world pace.
Compare like with like
Track similar routes and conditions when using pace trends to judge progress.
Use effort on hills
Trying to force identical pace uphill and downhill can distort effort. Use the split table as a reference, then adapt to the course.
Know GPS limits
Watch distance and pace can drift on turns, under tree cover, around tall buildings and on measured race courses.
Plan fueling separately
Long-distance pacing and hydration/fueling are related but separate decisions. Use the hydration tool for an additional planning estimate.
Related cardio & fitness tools
Connect pace with your broader training plan
Tool guide
Understand and use the Running Pace & Split Calculator
Use these tool-specific notes to understand the method, enter better data, interpret the output, and apply the result appropriately.
Pace, Time, Distance
Any two of distance, time, and pace determine the third. The calculator keeps the arithmetic consistent across kilometres, miles, and common race distances.
Metric ↔ Imperial
The exact mile conversion is used when switching units so the physical distance stays the same. Changing km to miles does not simply relabel the number.
Build Splits
Use even or target splits to plan checkpoints across a race or training session. Split tables are pacing aids, not guarantees that the pace will be sustainable.
Use Real Conditions
Hills, wind, heat, surface, fatigue, and GPS measurement can all affect real pace. Compare training sessions with enough context instead of treating every second as physiological change.
Frequently asked questions
Running Pace & Split Calculator FAQs
Practical answers about this tool's inputs, method, results, limitations, and common real-world use.
How do I calculate running pace?
Divide elapsed time by distance. A 25-minute 5K equals 5:00 per kilometer. This tool also converts that performance to pace per mile automatically.
How do I calculate speed from pace?
Speed is distance divided by elapsed time. For example, 5:00 per kilometer corresponds to 12.0 km/h.
Does the split table include a partial final split?
Yes. Full kilometers or miles are listed first, followed by a Finish row for any remaining fractional distance.
Can I use this for a treadmill?
Yes. Enter treadmill speed to calculate equivalent pace and finish time for a selected distance. Real outdoor running can differ because of terrain, wind and other conditions.
Why are marathon and half-marathon distances not round numbers?
The marathon preset uses 42.195 km and the half marathon uses 21.0975 km, so split calculations preserve the official race distances.
Are GPS watch splits always exact?
No. Consumer GPS distance can differ from a measured course, especially around turns, buildings or poor satellite coverage. Treat watch pace as useful field data rather than perfect course measurement.
What is the difference between running pace and speed?
Pace is time required per unit distance, such as min/km or min/mile. Speed is distance covered per unit time, such as km/h or mph; one increases when the other decreases.
How are race splits calculated?
The calculator multiplies the target pace by each checkpoint distance. Even splits assume constant pace, while real races can be faster or slower in different sections.
Can I enter a custom race distance?
Yes. Use a custom distance when your event is not one of the presets. If you switch units, the calculator converts the numeric distance so the actual route length is preserved.
Why can treadmill pace differ from outdoor pace?
Treadmill calibration, belt mechanics, air resistance, terrain, weather, and self-selected pacing can create differences. Use the pace calculator for arithmetic, not as proof that two environments are physiologically identical.
Method & references
Distance standards and calculation method
The pace/speed equations are direct unit conversions. Race presets use established road-running distances.
- World Athletics certified road events — identifies certified road-race distances including the mile, 5 km, 10 km, half marathon and marathon.
- Marathon preset: 42.195 km. Half-marathon preset: 21.0975 km.
- 1 international mile = 1.609344 km for unit conversion.
Content reviewed: .
Pacing note
This calculator provides mathematical pace and split estimates. It does not account for course elevation, weather, fatigue, illness, injury, recovery status or individual race strategy. Adjust training and race targets to your experience and current condition.