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Jeffing Calculator
Master the run-walk method with precision. Calculate optimal intervals and predict your finish time
with optional fast finish strategies.
- Run/walk interval optimisation
- Fast finish planning
- Distance per cycle calculation
- Effective pace calculation
Open Jeffing Calculator →
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Pace Table Generator
Generate time tables for track workouts. Perfect for interval training and
understanding pace progression across common track distances.
- Customisable pace ranges
- Multiple distance targets
- Track split calculations
- Export-ready tables
Open Pace Table →
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Age Grade Calculator
Calculate Age Grade for road distances using the 2015 and 2025 WMA factors. Note parkrun is based on
the 2015 factors.
- Age Grade from time
- Time from Age grade
- Future age grades and times
- 2015 and 2025 WMA factors
Open Age Grade Calculator →
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Head to Head Calculator
Compare the performance of two runners side by side using WMA Age Grades
- Compare 2 Runners
- Calculate Age Grades from times
- See who the winner is!
- 2015 and 2025 WMA factors
Open Head to Head Calculator →