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Ultramarathon Finish Time Predictor Calculator
Predict ultramarathon finish time from a marathon time with fatigue and terrain factors.
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Predict ultramarathon finish time from a marathon time with fatigue and terrain factors.
Ultramarathon Finish Time Predictor Estimator
Enter your numbers below for an instant estimate.
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💡 Tip: Finish = marathon time x (distance / 42.195)^k + climb allowance.
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Ultramarathon Quick Guide
Typical values for reference.
| Marathon h | Distance | Climb | Finish |
|---|---|---|---|
| 3.5 h | 50 km | 1000 m | 4h 22m |
| 4 h | 80 km | 2500 m | 8h 51m |
| 4.5 h | 100 km | 3500 m | 13h 10m |
| 5 h | 160 km | 6000 m | 26h 36m |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Ultramarathon Finish Time Calculator FAQ
Answers to common questions about this calculator.
Scale a marathon time by distance with a fatigue factor.
Yes, add time for every 100 m of ascent.
It is a rough guide.
Fuelling plans strongly affect late-race pace.