Pace Calculator
Calculate running pace, finish times, or required speed for races.
A pace calculator computes running pace (time per mile or kilometer) from a distance and total time, or works in reverse to predict finish time from a target pace and race distance. This running pace calculator doubles as a marathon pace calculator, jogging pace calculator, and half marathon pace calculator, supporting common race distances - 5K, 10K, half marathon, and marathon - for both training pace planning and race goal-setting.
Enter any two of distance, time, and pace to calculate the missing third value.
Worked Calculation Examples
| Scenario | Result | Calculation Step |
|---|---|---|
| Run 5K (3.1 miles) in 25 minutes | 8:03 / mile (5:00 / km) | Average speed of 7.46 mph. |
Pace vs. Speed: Two Ways to Describe the Same Thing
Pace expresses effort as time per unit distance (minutes per mile or per kilometer), while speed expresses it as distance per unit time (miles or kilometers per hour) - runners typically think in pace, while speed is more common in cycling and driving contexts. The two are mathematically related (pace is the inverse of speed), and this calculator can convert between them.
Using Pace to Set Realistic Race Goals
Working backward from a goal finish time - like breaking 4 hours in a marathon - to a required average pace is one of the most common uses of a pace calculator, since it translates an abstract time goal into a concrete per-mile target that is easier to track during the actual race or in training runs. A marathon (26.2 miles) finished in under 4 hours requires an average pace of about 9:09 per mile, for example.
Why Even Pacing Beats Uneven Pacing
Race strategy analysis generally shows that even or negative-split pacing (running the second half at the same speed or slightly faster than the first half) tends to produce better overall race times than starting fast and slowing down significantly - a fast start feels sustainable in the moment but often leads to a much larger slowdown later in the race than the early time gained, a pattern often called 'positive splitting.'
How to Use the Pace Calculator
- Open the Pace Calculator and enter the values requested in the input fields.
- Check the units, percentages, dates, or time periods before reading the answer.
- Review the instant result and adjust any value to compare another scenario.
- Use the formula, example, and FAQs below to understand how the pace calculator works.
Frequently Asked Questions
What pace is needed to break 4 hours in a marathon?
You need an average pace of 9:09 per mile (5:41 per km).
How do I calculate my pace per mile?
Divide your total time by the distance covered in miles. For example, running 5 miles in 45 minutes is a pace of 9 minutes per mile (45 / 5).
What's a good 5K pace for beginners?
Pace varies widely by fitness level, but many beginner runners complete a 5K (3.1 miles) somewhere in the 10-14 minute per mile range - the more meaningful goal for most beginners is consistent improvement over time rather than hitting a specific benchmark pace.
How do I convert pace to speed?
Divide 60 by your pace in minutes per mile to get miles per hour. For example, an 8-minute mile pace equals 7.5 mph (60 / 8).
What is negative split pacing?
Running the second half of a race faster than the first half. Pacing analysis generally associates negative or even splits with better overall race outcomes compared to starting too fast and fading.
Does this calculator work for kilometers as well as miles?
Yes, you can calculate pace, time, or distance using either miles or kilometers.
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Last updated: September 29, 2026.