• 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.

  • 1

    Aerobic Pace Calculator

    This calculator will tell you exactly what pace and heart rate will keep you running aerobically.

  • 2

    Age Grading Calculator

    Makes it easy to calculate your age graded performance to compare yourself against those young guns or your former self.

  • 3

    Fitness Loss Calculator

    Find out what your estimated performance decline would be for any race distance

  • 4

    Weight Loss Calculator

    An easy-to-use calculator that will help you determine your optimal HR training zones

  • AEROBIC PACE CALCULATOR

    Hydration Calculator

    Find out your sweat rate and how much you need to drink after a run based off conditions

  • 4

    Ideal Race Weight

    Based on your height, gender and body fat, researchers have developed a formula to determine what your ideal running weight is.