Marathon, half marathon, 10-mile & 10k run calculator

Marathon run calculator - calculate target times for marathons, half-marathons, 10k, 10-mile and other races
This marathon run calculator will develop your pecs too!
Use this Marathon Run Calculator to calculate target race times for marathons, half-marathons, 10-mile, 10k and any other race distance. As used by Paula Radcliffe's accountant's nephew!

OK, so you have decided to run a marathon. Or maybe a half marathon. Or maybe a 10k race. The big question is - what should your target time be?

Say you have just done an 8-mile training run in 56 minutes and 45 seconds. Are you are on-track for a 3 hour 30 minute marathon? Enter your training run distance and time, click on the big button and voila! the run calculator says yes, but only just: that translates into a marathon time of 3 hours, 29 minutes and 22 seconds.

Note that the Marathon Run Calculator doesn't just extrapolate speeds - it adjusts for fatigue in quite a complicated way, based on chunks of data gleaned from various running magazines.

If you are preparing for a half-marathon, or a 10k or ten-mile race, just substitute the correct distance. Also, check out my Training Run Calculator, which helps you calculate your marathon or other race targets based on your training runs.

Enter your best training run...      (just write over the default data)

Enter the distance you have just run:

 miles (or enter km and click )

Enter the time you just took:

hours minutes seconds

The distance for which you are training:

miles (or enter km and click )

And now...   


Target speed:  

 miles at  mph or  kph

Target run time:

hours minutes  seconds

Target split time:

 minutes and seconds per mile

Target split time:

 minutes and seconds per kilometer

Pretty cool, huh? Don't tell me I don't share the good sh*t with you. The Marathon Run Calculator is my first real javascript, and I'm donkey-proud of it!