Running Pace Calculator

How to Use Running Pace Calculator

1. Choose your mode. Select "Time + Distance → Pace" if you know your run time, or "Pace + Distance → Time" if you want to know how long a distance will take at a given pace.
2. Enter your values. For time mode, input the distance and your finish time (hh:mm:ss). For pace mode, enter your pace per km and the target distance.
3. Click Calculate. The tool computes your pace per kilometre and per mile, plus your speed in km/h.
4. Check the race predictions. The Riegel formula predicts your times for 5K, 10K, half marathon and full marathon based on the distance and time you entered.

Benefits of Running Pace Calculator

• Converts between time and pace in both directions, so you can plan a target pace or estimate a race finish time.
• Shows pace in both per‑km and per‑mile, helpful for runners who switch between metric and imperial events.
• The Riegel race predictor gives realistic finish time estimates for common race distances from a single known performance.
• No sign‑up needed; the calculator runs instantly in your browser.

Frequently Asked Questions

How accurate is the Riegel race time prediction?

It is a well‑validated formula, but it assumes equivalent training for the longer distance. A 5K‑based marathon prediction will be optimistic if you haven't put in the long runs.

What is a good running pace for a beginner?

A comfortable pace for new runners is typically 6:00–7:30 min/km. The goal is to maintain conversation during the run; speed will naturally improve with consistent training.

Can I use this calculator for treadmill running?

Yes, but treadmill pace calibration can differ slightly from outdoor running. Use the displayed pace as a reference and adjust based on perceived effort.

Is Running Pace Calculator free and private?

Yes — it is 100% free, needs no sign‑up, and everything runs in your browser; your data never leaves your device.