โฝ Sports
Marathon Finish Time Calculator
The Riegel formula predicts a longer race time from a shorter one using an exponent of about 1.06, which captures the way pace slows with distance. A half marathon time multiplied by 2.11 typically gives a realistic marathon estimate for a well-trained runner.
How it works
Recent race distance
Race time โ hours
Race time โ minutes
Fatigue exponent
Target distance
Predicted finish time
Predicted time
Required pace
Required pace
Halfway split
Note
Frequently asked questions
How do I use the Marathon Finish Time Calculator?
Fill in the fields above โ the result recalculates instantly as you type. Everything runs in your browser, so the values you enter are never collected or stored.
Is this calculator free?
Yes. It is completely free, requires no account, and works on phones, tablets and desktops.