Free Health & Fitness Calculators
Calculators for nutrition, training, sleep and pregnancy, from BMI and macros to VO2 max and pace, with clear explanations of what the numbers mean.
Most health numbers are simple formulas, but the details matter: which BMR equation, which activity multiplier, which heart rate formula. These calculators show the formula they use and explain the limits of each estimate, so you can use the results sensibly.
Use them together: find your calories with the calorie or BMR calculator, split them into macros, check your protein target, and track progress with the weight loss tracker template. Runners can pair the pace and VO2 max calculators with heart rate zones.
Popular health & fitness tools
- BMI Calculator — body mass index for adults
- Calorie Calculator — daily calories for your goal
- Macro Calculator — protein, carbs and fat
- BMR Calculator — three formulas compared
- Heart Rate Zone Calculator — training zones
- Due Date Calculator — pregnancy due date and week
- Intermittent Fasting Timer — track 16:8 and more
- Caffeine Calculator — caffeine in your system at bedtime
All results are general estimates for information only and are not medical advice. Talk with a healthcare provider about your own goals, especially during pregnancy or if you have a medical condition.
Health & Fitness — all tools
Frequently asked questions
Are these health calculators accurate?
They use standard, published formulas, which are good population estimates but cannot account for every individual difference.
Is my health data stored?
No. Calculations run in your browser; only the fasting timer saves its history, and only in your own browser.
Are these calculators medical advice?
No. They are educational tools. Speak with a doctor or registered dietitian about your personal health decisions.