Race Pace & Equivalent Time Calculator
Enter a recent race result and use it as a guide for equivalent race times and paces over other common distances.
Tips for Better Results
Race predictions are most useful when you treat them as a guide alongside your training, rather than as an exact promise of what you will run.
Predictions are generally most accurate when your recent race is reasonably close in distance to your target. For example, a 10K result usually gives a better half-marathon guide than a 1-mile result.
Marathon predictions based on short races such as a 5K can be optimistic unless you have the endurance, long runs, fuelling practice and marathon-specific training to support that pace.
Race-day conditions matter. Hills, trail terrain, heat, wind, fatigue, pacing and fuelling can all change the pace you can realistically hold.
How to use the guide
A recent race or hard time trial is much more useful than a training run where you had plenty left.
A 5K result usually gives a stronger guide to 10K than it does to a marathon because the endurance demands are closer.
Use the predicted pace alongside your training history, long-run endurance, terrain and current race-specific work.
Your recent result
For the best guide, use a recent race or hard time trial on reasonably similar terrain and conditions.
Your target race time and pace guide will appear here.
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Equivalent race guide
These are estimated equivalents from your entered result. Your best real-world pace may be a little faster or slower depending on training, terrain, weather, race profile, fuelling and how well suited you are to each distance.
| Distance | Equivalent time | Pace / km | Pace / mile | 400 m split |
|---|---|---|---|---|
| Calculate a recent result to fill the race guide. | ||||
How the estimate is calculated
The calculator uses the Riegel race-prediction relationship, a commonly used way of estimating equivalent performances between running distances.
The 1.06 exponent is a general endurance guide. Individual runners vary, so equivalent times should be treated as planning guidance rather than an exact prediction.