Train smarter with target heart-rate zones and running pace, speed, time, and distance.
Max heart rate and target training zones, including Karvonen (heart-rate reserve).
CalculatorSolve for pace, speed, time, or distance for any run.
A practical, evidence-based guide to estimating your maximum heart rate and using training zones to structure smarter workouts.
Learn the difference between pace and speed, how to read and convert pace, and how to use it to plan smarter, better-paced runs.
This tool is for general informational and educational purposes only and is not medical advice. It does not diagnose, treat, or replace care from a qualified professional. Always consult a physician or other qualified healthcare provider about your individual health.