Running Tools
Free running calculators and pace charts. No sign-up required — all tools run instantly in your browser.
Pace Chart
Find your finish time at any pace for 5K, 10K, Half Marathon, Marathon, and more. Toggle between km and mile pace.
Race Time Predictor
Enter a recent race result and predict your finish time for any other distance using the Riegel formula.
Calorie Calculator
Estimate how many calories you burn running based on your weight, distance, and pace using MET values.
VDOT Calculator
Calculate your VDOT score from a race result to get equivalent race predictions and training paces.
Heart Rate Zone Calculator
Calculate your heart rate training zones using Standard or Karvonen methods. Supports multiple max HR formulas.
Treadmill Pace Converter
Convert between treadmill speed and running pace. Adjust for incline to find your flat-equivalent effort.
GAP Calculator
Calculate your grade-adjusted pace for hill running. See what your uphill or downhill effort equals on flat ground.
VO2 Max Calculator
Estimate your VO2 max from a race result, Cooper test, or resting heart rate. Get a fitness classification based on age and sex.
Track Your Running With ActivityManager
Automate your Strava activities, match workouts, and track your training with powerful rules. Connect Garmin, COROS, and more.
Try ActivityManager Free