Health & Fitness Calculators
Estimate body mass index, daily calorie needs, basal metabolic rate, body fat and more using the formulas health organisations and researchers actually publish. Every page names its formula and links to the source.
These tools give screening estimates, not diagnoses. Bodies differ, so treat the numbers as a starting point and talk to a doctor or registered dietitian before making decisions about your health.
Body weight and shape
Calories and nutrition
- Calorie Calculator Estimate daily calories to maintain, lose or gain weight.
- BMR Calculator Estimate the calories your body burns at complete rest.
- Water Intake Calculator Estimate your daily water needs from official reference intakes.
- Macro Calculator Turn your calorie target into daily grams of protein, carbs and fat.
Fitness and training
- Running Pace Calculator Find your pace, finish time or distance in km or miles.
- Calories Burned Calculator Estimate calories burned for 40 activities from your weight and time.
- Heart Rate Zone Calculator Find your maximum heart rate and five training zones in bpm.
- One Rep Max Calculator Estimate your 1RM from a set of 10 reps or fewer.