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Free Running Tools
These tools run in your browser; you do not need an account. Your calculator inputs stay on your device. Plan running paces, race splits, heart-rate zones, weekly distance and strength training with examples and calculation details.
Running Volume Progression Calculator
Plan changes in weekly distance and check how each run grows. Use kilometres or miles.
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Running Pace Calculator
Given any two of pace, time, and distance — get the third instantly. Works in kilometres and miles.
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Race Time Predictor
Use a recent race result to estimate finish times at other distances with the Daniels-Gilbert formula.
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Training Pace Calculator
Find paces for easy runs, marathon training and faster workouts from a recent race result.
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Heart Rate Zone Calculator
Compare heart-rate zones using your age, heart-rate measurements or tested thresholds.
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Race Pace Calculator
Enter a goal finish time or choose a pace for each part of your race. Check that your splits add up.
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Race Strategy Calculator
Use a recent race result or your activity data to compare slower and faster race splits.
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