Heart Rate Calculator
An easy-to-use calculator that will help you determine your optimal HR training zones
Improvement Calculator
Estimate your rate of improvement based on your experience level
Long Run Pace Calculator
Find your optimal long run pace based on scientific research and evidence
Temperature Conversion Calculator
Now you can calculate exactly how much heat is impacting your race & workout times
Boston Marathon Calculator
This calculator will tell you exactly how to pace the fabled Boston Marathon course.
Aerobic Pace Calculator
This calculator will tell you exactly what pace and heart rate will keep you running aerobically.
Age Grading Calculator
Makes it easy to calculate your age graded performance to compare yourself against those young guns or your former self.
Fitness Loss Calculator
Find out what your estimated performance decline would be for any race distance
Weight Loss Calculator
An easy-to-use calculator that will help you determine your optimal HR training zones
Hydration Calculator
Find out your sweat rate and how much you need to drink after a run based off conditions
Ideal Race Weight
Based on your height, gender and body fat, researchers have developed a formula to determine what your ideal running weight is.