Running Pace Calculator & Race Split Planner
Enter any two of distance, time and pace to get the third — in kilometers or miles — then turn the result into a printable split table.
Enter a distance and a time to see your pace.
These results calculate a pacing scenario from your inputs. They do not predict your fitness or guarantee that a target is achievable.
How it works
- Pick a mode: find pace (distance + time), find time (distance + pace) or find distance (time + pace). Only the two inputs of the chosen mode are editable.
- Results update as you type. Switching between km and miles keeps your values and changes only the display.
- Everything is calculated in your browser. Nothing you enter is sent to a server.
Worked example
Distance 10 km in a time of 50:00 gives a pace of 5:00 per kilometer, about 8:03 per mile, and a speed of 12.00 km/h. Select “Load example” in the calculator to reproduce it, then open the race split calculator to break the same run into 1 km or 1 mile segments.
Pace vs speed
Pace and speed describe the same run from opposite directions: pace is how long each kilometer or mile takes, speed is how far you travel per hour. The calculator shows both because watches and treadmills mix the two conventions. For the exact relationship and conversion shortcuts, read running pace vs speed and min/km vs min/mile.
Frequently asked questions
How do I calculate my running pace?
Pace is time divided by distance. Enter a distance and your finish time above — for example 10 km in 50:00 — and the calculator shows the matching pace for every kilometer and mile, plus the equivalent speed.
What pace do I need for a 50-minute 10K?
A 50:00 10K is exactly 5:00 per kilometer, which is about 8:03 per mile or 12 km/h. Load the example above to see it in the calculator, then use the split planner to break it into laps.
Is pace the same as speed?
No. Pace is time per unit distance (min/km), while speed is distance per unit time (km/h). They are inverses of each other, so a faster (smaller) pace means a higher speed. Read the full pace vs speed explainer.
Related guides
- Min per km vs min per mile — Why both conventions exist, the exact 1.609344 conversion, and quick mental math.
- How to read race splits — Cumulative vs segment times, and why a 1-second wobble is just rounding.
- Even vs negative splits — What the two pacing scenarios mean and how the calculator models them.