Rex says
Same equations the textbooks use — just way less awkward. Pop in your stats and I'll tell you what the number actually means for you.
Try a scenario
Click to load — tweak from there.Inputs
Result
Pace per km
5:00
Pace per mile
8:03
Speed (km/h)
12.00
Speed (mph)
7.46
Psst — share this and help Rex grow
One click, a permanent link with your numbers baked in.
How to use this
- 1Enter distance.
- 2Enter distance unit.
- 3Enter hours.
- 4Enter minutes.
- 5Enter seconds.
- 6Read your pace per km on the right — it updates as you type.
- 7Hit Share to keep the scenario or send it to someone.
About this calculator
Given a distance and finish time, compute pace per mile and per kilometer.
Worked example
Using the values the calculator loads with:
Inputs
- Distance: 5
- Distance unit: Kilometers
- Hours: 0
- Minutes: 25
- Seconds: 0
Results
- Pace per km: 5:00
- Pace per mile: 8:03
- Speed (km/h): 12
- Speed (mph): 7.46
What each field means
Inputs
- Distance
- The distance used in the calculation. Starts at 5 so you have a working example on load.
- Distance unit
- Pick the option that matches your situation — the maths changes per option. Choices: Kilometers, Miles.
- Hours
- The hours used in the calculation. Starts at 0 so you have a working example on load. Accepted range: 0–24.
- Minutes
- The minutes used in the calculation. Starts at 25 so you have a working example on load. Accepted range: 0–59.
- Seconds
- The seconds used in the calculation. Starts at 0 so you have a working example on load. Accepted range: 0–59.
Results
- Pace per km
- Returned as a plain value and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Pace per mile
- Returned as a plain value. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Speed (km/h)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Speed (mph)
- Returned as a decimal number. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the running pace calculator work?
Given a distance and finish time, compute pace per mile and per kilometer.
What do I need to enter?
5 values: distance, distance unit, hours, minutes, and seconds. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the pace per km result mean?
It is returned as a plain value and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Population formulas describe averages; individual bodies vary, especially at the extremes of height, age, or muscle mass.
Who is this tool for?
It's built for anyone tracking a health or training target and wanting the standard formula applied correctly, without a signup or an app.
Accuracy and limitations
- Population formulas describe averages; individual bodies vary, especially at the extremes of height, age, or muscle mass.
- Results do not account for medical conditions, medication, or pregnancy.
- Use this as a directional reference, not a diagnosis — talk to a clinician before acting on it.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Pace Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/pace
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/pace" target="_blank" rel="noopener">Pace Calculator — RevenueLab</a> (2026).</p>
Source: [Pace Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/pace) (2026).