Sports & Fitness Calculators

Sport and fitness — training calculators

Data-driven training consistently outperforms guesswork. The sports calculators on Liczbnik bring together the most important formulas so you can make informed decisions before, during, and after every session. Running pace expressed in minutes per kilometre is the standard metric for runners. Enter a time and distance and the calculator instantly returns your pace alongside the equivalent speed in km/h, letting you structure each segment of a training plan and measure progress over time. Karvonen heart rate zones factor in both resting and maximum heart rate, producing a personalised intensity range that is more accurate than simple percentage-of-max-HR formulas. Zone 2 (60–70% of heart rate reserve) is the aerobic base-building zone, while zones 4 and 5 are reserved for threshold and interval work. In powerlifting and strength training, the one-rep max (1RM) is the heaviest load you can lift for a single repetition. The Brzycki formula estimates your 1RM from a submaximal set, allowing you to gauge strength safely without a true max attempt. VO2max measures the maximum volume of oxygen your body can consume per minute per kilogram of body weight (ml/kg/min). Values above 50 ml/kg/min are typical of trained endurance athletes. The calculator estimates VO2max from running pace or Cooper test results. Calories burned during any activity are calculated using the MET value: kcal = MET x body weight (kg) x duration (h). MET values for running range from about 6 for a slow jog to over 16 for an all-out sprint, so intensity has an enormous impact on total energy expenditure. The step counter is useful for anyone targeting 10,000 steps per day: it converts distance to steps based on stride length derived from height, or a manually entered value.