10K Pace From 5K: Calculate Your Target Pace

To calculate a 10K pace from a 5K result, enter your 5K finish time and the distance, in kilometres, you want to predict. The calculator applies a standard race-time projection and returns an estimated 10K pace and speed; it is a planning estimate, not a guarantee of your result.

Formula

This calculator uses the Riegel-style race-time prediction formula: T₂ = T₁ × (D₂ / D₁)^1.06. It first predicts your finish time for the target distance, then divides that time by the target distance to find average pace.

• T₁ is your 5K finish time, converted to minutes.
• D₁ is the reference distance, 5 kilometres.
• D₂ is the target distance in kilometres.
• T₂ is the predicted target finish time in minutes.
• Pace is T₂ ÷ D₂, in minutes per kilometre.

The exponent 1.06 represents an expected slowing as race distance increases. It makes the prediction more realistic than assuming you can hold your 5K pace for twice as far. The calculator displays pace to two decimal places in decimal minutes per kilometre, and speed in kilometres per hour.

Worked Example

With the defaults, the 5K time is 25 minutes and the target distance is 5 kilometres. The target is also 5K, so the formula should return the original pace:

1. Predicted time = 25 × (5 ÷ 5)^1.06 = 25 minutes.
2. Estimated pace = 25 ÷ 5 = 5 minutes per kilometre.
3. Estimated speed = 5 ÷ (25 ÷ 60) = 12 kilometres per hour.

So the calculator returns 5.00 min/km and 12.00 km/h for these default inputs. This same-distance example is a useful check that the formula is being applied correctly.

How to Estimate 10K Pace From a 5K

For a 10K prediction, enter your actual 5K finish time and set the distance to 10 kilometres. The calculation is T₂ = T₁ × 2^1.06, or approximately your 5K time multiplied by 2.085. Divide the projected 10K time by 10 to get minutes per kilometre.

For example, a 5K completed in 25 minutes gives a projected 10K time of about 52.1 minutes. That works out to roughly 5.21 minutes per kilometre, or about 5 minutes 13 seconds per kilometre. The predicted average speed is about 11.5 km/h. These are estimates: your course, weather, training, pacing, and race-day condition can change the outcome.

If you already know your 5K pace, multiply it by about 1.042 to estimate the 10K pace using this model. For instance, 5:00 per kilometre becomes about 5:13 per kilometre. This small pace increase compounds over ten kilometres, so the projected finish time is more than simply “twice the 5K pace” held unchanged.

When This Estimate Is Useful

A 5K-to-10K projection can help set an initial goal, plan a training effort, or compare performances over different distances. It is most useful when your 5K is recent, accurately measured, and run as a genuine hard effort on a reasonably comparable course.

• Use a recent race or timed effort rather than a casual run.
• Enter the full elapsed time, including seconds as a decimal if needed: 24:30 is 24.5 minutes.
• Choose 10 km for a standard 10K prediction. If you enter miles, convert the distance first; this calculator accepts kilometres only.
• Treat the result as a reference range or starting point, not a prescribed pace for every kilometre.

A race predictor cannot infer how much endurance training you have done. A runner with strong speed but little experience at longer distances may find the predicted 10K pace too ambitious. A runner who trains regularly for longer events may perform better than the formula suggests.

How to Read Pace and Speed

Pace is the time needed to cover one unit of distance. A pace of 5:13 min/km means about five minutes and thirteen seconds per kilometre; a lower pace number means a faster running speed. The calculator’s pace output is decimal minutes, so 5.21 min/km is about 5 minutes 13 seconds—not 5 minutes 21 seconds. Multiply the decimal part by 60 to convert it to seconds.

Speed expresses distance covered per hour. The same example’s approximate 11.5 km/h is the equivalent speed, but most runners find pace more useful for setting kilometre splits. To convert kilometres to miles, 1 km is approximately 0.621 miles; to convert kilometres per hour to miles per hour, multiply by approximately 0.621. Pace per mile will have a different numerical value and unit than pace per kilometre.

Limits and Common Mistakes

The formula models a typical decline in sustainable pace as distance rises; individual performance does not always follow that curve. It is less dependable when predicting much longer distances from a short race, when the 5K effort was not maximal, or when race conditions differ substantially. The exponent is a simplifying assumption, not a measurement of your personal endurance.

• Confusing decimal minutes with minutes and seconds: 5.50 minutes equals 5:30, not 5:50.
• Entering the wrong distance unit: use 5 for a 5K reference and 10 for a 10K target, both in kilometres.
• Assuming the predicted time is certain: the result is a model-based projection, and real race results vary.
• Comparing different kinds of efforts: a fresh, flat-course race is not directly equivalent to a training run with hills or stops.

For a more personalized prediction, compare several recent race performances at different distances, or use a recent 10K result if available. The formula can also calculate estimates for other target distances by changing the distance input, but accuracy generally depends on having suitable race-specific endurance.

Frequently Asked Questions

How do I calculate my 10K pace from my 5K time?
Multiply your 5K time by about 2.085 to estimate a 10K finish time, then divide that time by 10. The equivalent pace is about 1.042 times your 5K pace.

What 10K time does a 25-minute 5K predict?
The Riegel-style estimate is about 52 minutes 8 seconds for 10K, at approximately 5:13 per kilometre. Your actual result can be faster or slower.

Is 10K pace the same as 5K pace?
Usually, a runner’s average pace over 10K is slower. The projection accounts for this by increasing expected time per kilometre as distance grows.

Can I use a 5K training run to predict my 10K?
You can enter its time, but a relaxed or interrupted run is not a strong predictor of race performance. A recent, accurately timed hard effort gives a more useful estimate.

How do I convert min/km to min/mile?
Multiply minutes per kilometre by about 1.609 to get minutes per mile. Convert the decimal fraction of a minute into seconds afterward; for example, 5.00 min/km is about 8:03 min/mile.

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in t | Finish time | min | 25 | 0
in d | Distance | km | 5 | 0
out pace | Estimated pace | min/km | (t / 60) * (d / 5) ^ 1.06 * 60 / d | 2
out speed | Estimated speed | km/h | d / ((t / 60) * (d / 5) ^ 1.06) | 2