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Marathon Time Calculator - Race Finish Predictor
Free marathon time calculator. Predict your finish time for 5K, 10K, half marathon, and marathon based on your pace.
Marathon Time Calculator
Predict your race finish time
Race Prediction
Enter your values to see results
and click the "Calculate" button
Marathon Time Calculator
Calculate your predicted finish time for any race distance. See if you're on track to Boston Qualify.
Race Time Formula
Finish Time = Distance × Pace
Marathon: 26.2 miles. Half: 13.1 miles. 10K: 6.2 miles. 5K: 3.1 miles. Add 10-20 seconds/mile for longer races due to fatigue.
Frequently Asked Questions
What's a Boston qualifying time?
Varies by age/gender. Men 18-34: 3:00. Women 18-34: 3:30. Times get easier with age. Need to beat BQ by ~5+ min due to demand.
How accurate are pace predictions?
Works best for similar distances. 5K pace won't perfectly predict marathon. Training, weather, course elevation all affect actual race time.
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