Running Pace Calculator
This pace calculator works out the relationship between distance, time, and pace so you can plan a run, a race, or a training session. It is built for runners and walkers training for anything from a 5K to a full marathon.
There is no mode to pick: enter any two of the three values and the calculator detects which one to solve for and fills it in automatically. The computed field is highlighted, and a summary shows your pace in min/km and min/mi alongside your speed in km/h and mph.
How to Use the Pace Calculator
Enter any two values
Fill in two of the three fields — Distance, Time, or Pace. The third is calculated automatically and marked as the computed result.
Use a distance preset
Tap 1K, 5K, 10K, Half, or Full to drop in a popular race distance without typing it.
Switch units if needed
Toggle distance between km and mi, and pace between min/km and min/mi. Existing values convert automatically when you switch.
Read the summary
The Speed summary shows your pace in both min/km and min/mi, plus your speed in km/h and mph, all at once.
Open the Race Pace Table
Expand the Race Pace Table to see estimated finish times for 1K through 50K at your current pace, with the closest distance highlighted.
Features
Smart Auto-Detection
Enter any 2 of the 3 values (distance, time, pace) and the calculator computes the third — no mode to select.
Real-Time Calculation
The computed field updates as you type and is highlighted so you always know which value was solved for.
Race Distance Presets
One-tap presets for 1K, 5K, 10K, Half Marathon (21.0975 km), and Marathon (42.195 km).
Distance Unit Toggle
Switch between kilometers and miles; any distance you entered converts automatically.
Pace Unit Toggle
Flip pace between min/km and min/mi, with values recalculated on the fly.
Speed Summary
See your pace in both min/km and min/mi plus your speed in km/h and mph in a single view.
Race Pace Table
Estimated finish times for six distances from 1K to 50K, with the row closest to your distance highlighted.
Saved Unit Preferences
Your distance and pace unit choices are remembered in your browser for your next visit.
Frequently Asked Questions
How do I calculate running pace from distance and time?
Enter your distance and your total time, and the calculator divides the time by the distance to give your pace. For example, 10 km in 50:00 works out to a pace of 5:00 min/km. You do not need to do the math yourself — just fill in two fields and the pace appears.
What is a good pace per km?
It depends on your fitness and the distance. As a rough guide for a 5K, beginners often run around 7:00–8:00 min/km, intermediate runners 5:30–6:30 min/km, and advanced runners 4:00–5:00 min/km. Use these as targets rather than rules and adjust to how you feel.
How do I convert pace to speed (km/h)?
Divide 60 by your pace in minutes. A pace of 5:00 min/km equals 60 ÷ 5 = 12 km/h. The calculator does this for you and shows speed in both km/h and mph in the summary.
What is the difference between pace and speed?
Pace is the time it takes to cover one unit of distance, such as 5:00 min/km. Speed is how far you travel in an hour, such as 12 km/h. They are inversely related: a lower (faster) pace means a higher speed.
How do I find my marathon pace?
Tap the Full preset to set the marathon distance (42.195 km), then enter either your target finish time or your goal pace. The calculator fills in the missing value, and the Race Pace Table shows finish times for shorter distances at the same pace.
How accurate are pace estimates for longer distances?
The calculator assumes a constant pace across the whole distance. In a real race most runners slow down over time because of fatigue, so treat the result as a baseline target rather than a guarantee, and plan splits accordingly.
Is my data private?
Yes. Every calculation happens in your browser and nothing is sent to a server. Only your unit preferences are stored, and they stay locally on your device.
No comments yet. Be the first to comment!