RediCalc.com
Last updated: June 1, 2026

Running Pace Calculator

Calculate your running pace per mile or kilometer from any distance and time. Get instant race predictions for 5K, 10K, half marathon, and full marathon distances using the Riegel formula.

Enter Your Run Details

hr
min
sec

Pace & Predictions

Pace per km5:00/km
Pace per mile8:02/mi
Speed12.0 kph / 7.5 mph
5K Prediction25:00
10K Prediction52:07
Half Marathon1:55:00
Full Marathon3:59:46
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Understanding the Running Pace Calculator

A running pace calculator connects the three variables every runner cares about — distance, time, and pace. Enter any two and it finds the third, so you can plan race strategy, predict finish times, or figure out the pace you need to hit a goal.

Pace, time, and distance

Pace is usually expressed as minutes per mile or per kilometer. Knowing your target pace lets you plan exactly how fast to run each segment of a race, while predicting a finish time from a training pace helps set realistic goals. Even splits — running each mile at a steady pace — are a proven strategy for many distance races.

Using pace in training

Different workouts call for different paces: easy runs build endurance at a conversational pace, while tempo and interval sessions push faster. Calculating these zones from your goal race pace helps structure training so each run serves its purpose, rather than running every day at the same middling speed.

Tips & things to know

  • Aim for even splits to avoid burning out early in a race.
  • Easy runs should feel conversational — most training is slow.
  • Use your goal pace to set training zones.

How the Running Pace Calculator Works

Pace is calculated by dividing total time by distance. Race predictions use the Riegel formula:

Pace = Total Time / Distance

Riegel Formula: T2 = T1 × (D2/D1)^1.06

Example: 5K in 25:00 → 5:00/km pace → predicted 10K: 51:30

Sources

  • Riegel, P.S. "Athletic Records and Human Endurance" (1981).

How to Use the Running Pace Calculator

1

Open the Running Pace Calculator

Navigate to the Running Pace Calculator page on Redicalc. The calculator loads instantly with no sign-up required.

2

Enter your values

Fill in body measurements such as age, weight, height, and gender. Toggle between metric and imperial units if available.

3

Review your results

Your running pace results appear instantly as you type. Review the breakdown, charts, or detailed analysis provided.

4

Adjust and compare

Try different input values to compare scenarios. This helps you understand how changes affect the outcome.

5

Share or save your results

Use the copy or share buttons to save your results. You can also bookmark the page for quick access later.

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Frequently Asked Questions

What is a good running pace for beginners?

Most beginners run at 10-13 minutes per mile (6:15-8:05 per km). Focus on completing the distance comfortably before trying to improve pace.

How accurate are race predictions?

The Riegel formula is most accurate when predicting races 2-4x your training distance. Predictions for very long distances may be optimistic without proper long-run training.

How can I improve my running pace?

Include interval training, tempo runs, and long runs in your program. Gradually increase weekly mileage by no more than 10% per week.

What is negative splitting?

Running the second half of a race faster than the first. It is considered the most efficient pacing strategy for distance running.

Does pace change with elevation?

Yes. Expect to add roughly 12-15 seconds per mile for every 100 feet of elevation gain. Adjust expectations for hilly courses.