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Sports & Fitness Calculators

Calculate your running pace per km, set Karvonen heart rate zones, find your 1 rep max for powerlifting, and estimate VO2max. The MET-based calorie calculator converts any activity into kilocalories burned, while the step counter translates distance into steps and back. Pick a calculator below.

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.

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Frequently asked questions about sport

How to calculate BMI?

BMI = weight (kg) / height² (m²). Normal: 18.5–24.9; overweight: 25–29.9; obese: ≥ 30.

What is BMR?

BMR (Basal Metabolic Rate) is the minimum calories needed to sustain life at rest.

How to calculate maximum heart rate?

Maximum heart rate (HRmax) ≈ 220 − age (Haskell) or more accurately: 208 − 0.7 × age (Tanaka).

Running burns approximately 60–80 kcal/km depending on body weight. E.g. a 70 kg person burns ~70 kcal/km.

Heart rate zones are intensity ranges (%HRmax): Z1 (<60%), Z2 (60–70%), Z3 (70–80%), Z4 (80–90%), Z5 (>90%).

Running pace [min/km] = time (min) / distance (km). E.g. 30 min / 5 km = 6:00 min/km.

Daily calorie need = BMR × physical activity level (PAL). For moderate activity: BMR × 1.55.

A healthy BMI is 18.5–24.9. Below 18.5 is underweight; above 25 is overweight.

Body fat % can be estimated using skinfold measurements or formulas (e.g. Navy Body Fat Formula).

BMI does not account for body composition — it may overestimate results in muscular athletes. Body fat % is more accurate.