Online Pace Calculator

What Is This Tool?

The Pace Calculator helps runners work out pace, time, or distance — give it any two and it finds the third. The Pace tab takes a time and distance and returns your pace as min/mile and min/km, plus speed as mph, km/h, m/min, and m/s. The Time tab turns a distance and pace into a total time, and the Distance tab turns a time and pace into a distance in miles, kilometers, meters, and yards. Every tab also estimates finish times for popular races from the marathon down to 800 meters. Distance can be entered in kilometers or miles, and results can be downloaded as a PDF.

How to Use This Tool?

• Choose Pace, Time, or Distance mode.
• Enter the two values you know — time, distance, or pace.
• Click Calculate to see the result and race-time estimates.
• Switch units or download a PDF as needed.

Key Features

• Calculates pace, time, or distance from the other two values.
• Shows speed in min/mile, min/km, mph, km/h, m/min, and m/s.
• Estimates finish times for popular races from the marathon to 800 meters.
• Includes a quick event picker that fills in standard distances.
• Supports kilometers or miles and offers a PDF download.

Examples

• 1:20:00 over 8.05 km gives a pace of 9min 57s per km, or 16min per mile.
• That same effort equals 6.035 km/h and 1.676 m/s.
• A 5 km run at 8min/km takes 40 minutes.
• 12:30:00 at 8min/km covers 93.75 km.

Common Use Cases

• Planning a target pace for a race.
• Estimating finish time for a given distance and pace.
• Working out how far you can go in a set time.
• Comparing your speed across different units.
• Setting split goals for training runs.

Tips & Best Practices

• Enter time as hh:mm:ss for accurate results.
• Use your goal pace to project race finish times.
• Match the distance unit to how you measure your runs.
• Build pacing plans around the race-time table.
• Treat estimates as targets — real pace varies with terrain and fatigue.

Limitations

• Estimates assume an even pace and ignore hills, wind, and fatigue.
• Race-time projections are theoretical, not performance predictions.
• The Pace tab calculates in kilometers internally.
• Nothing is saved between sessions — only the current result can be exported as a PDF.

Frequently Asked Questions

What can it calculate?

Any one of pace, time, or distance when you provide the other two.

What's the difference between pace and speed?

Pace is time per distance, such as min/km; speed is distance per time, such as km/h.

How does it estimate race times?

It applies your pace to standard race distances to project finish times.

Can I use miles?

Yes — switch units on the Pace tab; the other tabs work in kilometers.

Key Terminology

Pace

The time taken per unit of distance, such as minutes per kilometer.

Speed

The distance covered per unit of time, such as kilometers per hour.

Split

The time recorded for a specific segment of a run.

Marathon

A race of 42.195 kilometers.

Finish time

The total time projected to complete a distance.

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