Sports
Race Projection Calculator
Scale a known result with an explicit fatigue exponent, then apply training and target-course changes separately before deriving target pace.
Target-to-known distance ratio-
Baseline projected target time (minutes)-
Time after entered training change-
Projected target finish time-
Projected pace (minutes per km)-
Known pace (minutes per km)-
Projected target pace minus known pace-
Projected average speed (km/h)-
Decision view
Known-race to target-race projection
Known-race to target-race projectionDistance scaling, training change, and course adjustment are applied in separate labeled steps.
Exact scenario comparisonDistance-fatigue exponent changes while all other entered assumptions remain constant.
| Distance-fatigue exponent | Target-to-known distance ratio | Baseline projected target time (minutes) | Time after entered training change | Projected target finish time | Projected pace (minutes per km) | Known pace (minutes per km) | Projected target pace minus known pace | Projected average speed (km/h) |
|---|
How to use Race Projection Calculator
- Use a recent comparable race.
- Choose an exponent appropriate to distance and athlete.
- Treat training and course adjustments as explicit scenarios.
Calculator guide
Understanding Race Projection Calculator
A race projection is a distance-scaling heuristic adjusted for training and course conditions, not a promised finish time.
Calculation method
How the calculation works
Scale a known race result by an explicit distance-fatigue exponent, then apply separately entered training and target-course adjustments. Multiply known time by the distance ratio raised to the entered exponent, then apply training and course percentages sequentially.
Race planning
Turn the projection into pacing bands
Use the central result as a planning anchor rather than an exact target.
Worked situations
Practical examples
- Longer distances usually project a slower pace.
- A negative training change reduces time.
- A positive course adjustment increases projected time.
Better inputs
Useful tips
- Compare more than one exponent.
- Use similar terrain and weather.
- Include fueling and injury context.
Before relying on the result
Limitations and common mistakes
- Fitness, training specificity, elevation, heat, wind, terrain, fueling, injury, pacing, and distance accuracy are excluded.
- The exponent is a heuristic.
- Uncertainty grows with distance mismatch.
Reference
Key terms
- Fatigue exponent
- Power applied to the target-to-known distance ratio.
- Base projection
- Distance-scaled time before other adjustments.
- Course adjustment
- Entered percentage change for target conditions.
- Target pace
- Projected time divided by target distance.
Important note
Calculated from the entered performance values using the displayed method. Health, fitness, terrain, weather, equipment, and event conditions can change real-world outcomes.
Frequently asked questions
What does a negative training change mean?
It shortens projected time.
Is the exponent universal?
No.
Does target pace include stops?
No.
Can this predict a first race?
Only if a suitable known performance is available.