Not sure how far that last run was? Use this Google-based app to determine your distance.
Find out what pace you need for your next PR race with MarathonGuide.com's pace calculator.
Heat Impacting Pace Calculator
Calculate exactly how much heat is impacting your race and workout times with this unique pace calculator from RunnersConnect.net.
Age-Grading calculations take into account your age and gender to produce a percentage score for your run. The calculation uses data collated by the World Association of Veteran Athletics, to adjust your performance for age and gender. It takes World Record performances for each age and distance, for both men and women, and uses these as benchmarks. Find out more through Goodrunguide.co.uk.
Hal Higdon Training Plans
Hal Higdon is one of the founders of the Road Runners Club of America and long-time contributor of Runners' World magazine who has comprehensive sets of training plans/guides from 5k to marathons. He also offers other guides for new runners and triathlons.
The Injured Runner
"The Injured Runner" provides the most comprehensive, research based information available to help runners completely recover from injury. Offers articles and products to help runners do what they love to do - run!