Race Finish Time Predictor
Predict your race finish time based on your time at any split checkpoint. Enter your split and see your projected finish assuming even pacing throughout the race.
Race Distance
Split Checkpoint
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How to Use
Select your race distance
Choose the total distance you're racing (5K, 10K, Half Marathon, Marathon, etc.).
Select your split checkpoint
Choose where you're taking your split (1K, Mile, 5K mark, etc.). Only checkpoints before the finish are shown.
Enter your split time
Type the time when you reached your checkpoint in MM:SS or H:MM:SS format.
View projected finish
See your projected finish time and race progress percentage.
How It Works
Finish = Split Time x (Race Distance / Split Distance)
Example: First 5K of a 10K in 22:00
22:00 x (10 / 5) = 44:00 projected finish
This assumes even pacing. For longer races where fatigue plays a larger role, consider adding a buffer to your projection for more realistic expectations.
Frequently Asked Questions
How do I predict my race finish time from a split?
Enter your total race distance, a split checkpoint (like the first mile or 5K), and your time at that split. The calculator projects your finish time assuming you maintain the same pace throughout the race.
Why would my actual finish time differ from the prediction?
Race times often differ from projections due to positive or negative splits. If you start fast and slow down (positive split), your finish time will be slower. If you negative split (start conservatively and speed up), you'll finish faster. Weather, hills, and fatigue also affect pacing.
Can I use this for workouts and tempo runs?
Absolutely. Enter your total workout distance, a segment distance, and the time for that segment. This helps you project your workout finish time and ensures you're hitting target paces throughout the session.
What's a good split to use for marathon prediction?
The half marathon split is most common for marathon predictions. If you run a 1:45:00 half and maintain that pace, you'd project a 3:30:00 marathon. Most runners slow down in the second half, so experienced marathoners often add 2-5% to their projected time.