Pace Calculator - Running Pace, Time & Distance (km or mi)

Calculate running pace, finish time, or distance for 5K, 10K, half marathon, or marathon

🔒 100% in-browser🆓 Free forever⚡ No sign-up
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Pace / km
5:00
Speed
12.00 km/h
Common race distances (km): 5K=5, 10K=10, half=21.0975, marathon=42.195.
Estimates only. Results are generated by generalised formulas from the inputs you provide and are for informational purposes only. They are not financial, tax, legal, medical, or professional advice, and do not account for your individual circumstances, jurisdiction, taxes, fees, or health conditions. Verify important figures with a qualified professional. By using this tool you agree to our Terms & Disclaimer.

How it works

  1. 1
    Pick what to find

    Pace, time, or distance. Toggle units (km or mi).

  2. 2
    Enter the other two values

    Time as h:mm:ss or mm:ss. Pace as mm:ss per unit.

  3. 3
    Read the answer

    The missing value and your average speed update instantly.

About Pace Calculator - Running Pace, Time & Distance (km or mi)

Free running pace calculator. Compute any of the three: pace per km or mile, finish time, or distance covered. Enter any two values and get the third instantly. Handy for training splits, race predictions, and pace charts. Runs entirely in your browser. Pace Calculator - Running Pace, Time & Distance (km or mi) on 712 Tools runs entirely inside your browser using modern JavaScript APIs - no server ever sees your data. That means instant results, complete privacy, and no upload limits.

Whether you need to calculate running pace, finish time, or distance for 5k, 10k, half marathon, or marathon for a debugging session, a quick sanity check, or a production incident, this tool is free to use as many times as you need. There are no watermarks, no sign-up, and no ads inside the tool itself.

Frequently asked questions

What are common race distances?

5K = 5 km, 10K = 10 km, half marathon = 21.0975 km (13.1094 mi), marathon = 42.195 km (26.2188 mi).

How do I convert min/km to min/mi?

Multiply min/km by 1.60934. Example: 5:00/km ≈ 8:03/mi.

Is my data uploaded?

No. All calculations run entirely in your browser.

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