What this tool does
The calculator converts distance and time into pace per mile, pace per kilometer, and average speed in mph and km/h. US units are shown first, and you can switch to Metric at any time.
How to use it
- Choose US or Metric units.
- Enter your distance and your time as MM:SS or HH:MM:SS.
- Use the result as your average pace for that effort.
- For interval work, calculate each segment separately if you want split-specific pace.
Important limitations
These numbers are planning estimates, not a diagnosis or individualized medical advice. They can be less appropriate during pregnancy, breastfeeding, adolescence, illness, recovery from an eating disorder, or when a clinician has given you specific nutrition instructions.
Frequently asked questions
Can I use kilometers?
Yes. US miles are shown first, and the unit selector lets you switch to kilometers. Results show both pace per mile and pace per kilometer.
Why does the time format matter?
The calculator expects MM:SS or HH:MM:SS so time can be parsed consistently.
Does this handle very long efforts?
Yes, up to a large cap, but it is designed mainly for normal training and race use.