These Running Calculators were created by Jonathan Farrell in 2014 - 2015 as a personal resource. The infomation here is as accurate as a calculator can be. Let's not forget that running is not always a calculated sport and that there is no way to calculate a runner's spirit, experience, or pain threshold. These calulators should be used as an informative guide and a suplement to your training.

• Pace Calculator: Need to know how fast you were running? Simply plug in the distance you ran and the length of time you were running, and we'll give you your pace per mile and MPH.
• Split Calculator: Want to nail perfect splits for a tempo run? Want to know where you should be during a race? Select your distance and enter your goal time and we’ll let you know exactly where you need to be.
• Finish Time Calculator: Want to know how long you’ll be out there running? Enter your target pace per mile and distance and we’ll let you know when you can plan on getting home.
• Training Calculator: Enter the time and distance of a goal race and we’ll tell you the pace recommendations that you should be training at.
• Race Time Predictor: This calculator lets you input an actual race time to see what you should be capable of at another distance. It is adjusted for distance (ie its 10K prediction isn’t just double your 5K time), but there are three caveats:
  1. It assumes you’ve done appropriate training for the distance. Doing a 22-minute 5K today doesn’t mean you can do a sub-4 marathon tomorrow. Obvious, really.
  2. It assumes you don’t have a natural significant bias towards either speed or endurance. Some people, no matter how much training they do, will always over-achieve at one end of the scale.
  3. The calculations become less accurate for times under three and a half minutes and over four hours.