Calwarden

Pace Calculator for Runners

Calculate running pace per mile or km.

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Inputs

miles

Your values stay on this device.

Results

Pace per Mile
Speed6.2

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Assumptions

  • The result uses average pace over the full distance rather than showing split-by-split variation.
  • Distance and time are assumed to be measured accurately and in consistent units.
  • Terrain, hills, weather, and stop time can make real race pacing feel very different from the average result.

Sensitivity preview

Hours -10%: Pace per Mile 9:41

Hours Current: Pace per Mile 9:41

Hours +10%: Pace per Mile 9:41

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About this Pace Calculator

Whether you are training for a 5K or a Marathon, knowing your pace helps you stay on track. This tool converts Time and Distance into Pace (min/mile) and Speed (mph).

Who this calculator is for

  • Runners converting finish times and distances into pace or speed.
  • Athletes planning race strategy for 5Ks through marathons.
  • Anyone checking whether a target time matches a realistic pace.

When to use it

  • Use this calculator after a run or race to find average pace.
  • Use it when setting target splits for an upcoming event.
  • Use it to compare how pace changes across distance or finishing time goals.

How to use this calculator

  1. Enter Time (Hours, Minutes, Seconds) of your run.
  2. Enter Distance traveled.
  3. View your Pace (minutes per mile) and Speed.

Key assumptions

  • The result uses average pace over the full distance rather than showing split-by-split variation.
  • Distance and time are assumed to be measured accurately and in consistent units.
  • Terrain, hills, weather, and stop time can make real race pacing feel very different from the average result.

Accuracy and testing

Review formula sources, default test cases, assumptions, unit handling, rounding rules, and changelog for this calculator.

View accuracy page

How this calculator works

Pace = Total Time / Distance. Speed = Distance / Total Time.

Inputs explained

Time

The duration of your run or race.

Distance

How far you ran. Common distances: 5K (3.1 mi), 10K (6.2 mi), Half Marathon (13.1 mi), Marathon (26.2 mi).

Understanding your results

Your Pace is the time it takes to complete one mile (or km). Lower numbers mean you are faster. Speed is your velocity in MPH.

Example scenarios

5K Run

3.1 miles in 30 minutes. Pace = 9:41 min/mile.

Marathon

26.2 miles in 4 hours. Pace = 9:09 min/mile.

Key Features

  • Pace (min/mi)
  • Speed (mph)
  • Marathon Support

Tips & Best Practices

  • To break a 4-hour marathon, you need to sustain a pace of 9:09 min/mile.
  • Try 'Negative Splits'—running the second half of a race faster than the first—for better performance.
  • Treadmill running is slightly easier; set incline to 1% to simulate road resistance.

Glossary of Terms

Split
The time it takes to complete a specific segment of a race (e.g., Mile 1, Mile 2).
PR
Personal Record. Your fastest time for a specific distance.

Frequently Asked Questions

What is a good pace?
It varies wildly. An average jogging pace is 10-12 minutes per mile. Competitive runners maintain 6-8 minutes per mile.
What are 'Splits'?
Splits refer to the time it takes to complete specific segments of a race (e.g., each mile or each 5km). Consistent splits usually lead to better race times.
How does treadmill pace compare?
Treadmill running is slightly easier due to lack of wind resistance. Set the incline to 1% to simulate road conditions.
What is a 'Negative Split'?
Running the second half of a race faster than the first half. This is a common strategy for setting personal records.
How fast is a 4-hour marathon?
To finish a marathon in 4 hours, you need to maintain an average pace of roughly 9 minutes and 9 seconds per mile.