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Performance projection
Predict your next race
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| Race | Projected finish | Average pace / mile |
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How accurate is the race prediction?
The calculator uses the Riegel performance formula: predicted time = known time × (target distance ÷ known distance)1.06. It assumes similar conditions and race-specific preparation. A 5K time alone cannot confirm marathon endurance, so longer-distance results can be optimistic.
Example
If you race a 5K in 22:00, the tool estimates your times across the other standard distances. You can change your race and time above to get your own estimates instantly.