Nine tools, one training picture
Pace Calculator
Calculate running pace, speed, distance, or time from any two known values. Plan your race splits, set training paces, and measure improvement across different distances.
Heart Rate Calculator
Estimate your target heart rate zones — resting, moderate, vigorous, and maximum — using age-based formulas. A practical reference for training intensity and cardiovascular awareness.
Calories Burned Calculator
Estimate calories burned during exercise based on activity type, duration, body weight, and intensity level. Covers walking, running, cycling, swimming, and many more activities.
1RM Calculator
Estimate your one-repetition maximum for strength training exercises using multiple validated formulas (Epley, Brzycki, Lombardi). A safe planning reference for progressive overload programming.
VO2 Max Calculator
Estimate your maximal oxygen uptake using submaximal test methods. A key indicator of aerobic fitness and cardiovascular endurance, useful for tracking training adaptations over time.
Walking Calories Calculator
Calculate calories burned during walking based on distance, duration, body weight, and pace. A simple tool for estimating the energy cost of your daily steps and walking workouts.
Running Calories Calculator
Estimate calories burned during running based on distance, pace, body weight, and terrain. A practical reference for runners planning nutrition and energy balance around training.
Steps to Calories Calculator
Convert your daily step count into an estimated calorie burn based on stride length, body weight, and walking speed. A motivational reference for general activity tracking.
Plank Calculator
Estimate your core endurance level based on how long you can hold a plank. A simple fitness benchmark for tracking core strength improvements over time.
Fitness, compared
Short reads that untangle the training methods people mix up most.
Fitness data is a compass, not a scorecard
Fitness calculators give you a starting estimate, not a fixed verdict. Your actual performance varies with sleep, nutrition, stress, and recovery — so the numbers on screen are most useful as baselines to test against your real-world experience.
Use these tools to plan your training, not to judge your progress. The healthiest relationship with fitness data is the one that leaves room for how you actually feel, perform, and recover — with adjustments guided by gentle trends rather than any single number.