Free health calculators for BMI, calories, hydration, sleep, fasting, and more — built to give you real answers, fast.
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Calculate your Body Mass Index with metric or imperial units. Understand your weight category with context.
Find your Total Daily Energy Expenditure and ideal calorie intake based on your goal.
How much water should you drink per day? Get a personalized recommendation based on weight and activity.
Find the best bedtime or wake-up time to align with your natural 90-minute sleep cycles.
Plan your fasting window for 16:8, 18:6, or 5:2. Get your eat/fast schedule at a glance.
Calculate your ideal daily protein, carbohydrate, and fat targets based on your body and goals.
Estimate your body fat percentage using the U.S. Navy method — no calipers needed.
Find your healthy weight range based on height, frame size, and multiple established formulas.
Calculate your finish time, required pace, or distance for any running goal.
Find out how much Vitamin D you need daily based on your age, sun exposure, skin tone, and location.
Find your optimal daily protein target based on your weight, activity level, and fitness goals.
Estimate your 1RM for any lift and get your full training percentage breakdown instantly.
Find your 5 personalised training zones for fat burn, cardio endurance, and peak performance.
Find your exact Zone 2 training range — the fat-burning, aerobic base-building sweet spot.
See exactly how many calories you burned based on your heart rate, age, weight, and workout duration.
Calculate your Maximum Aerobic Function heart rate using the Maffetone 180 Formula — personalised for your health and training status.
Find your Zone 1 active recovery range — the low-intensity ceiling for rest-day movement that reduces soreness without adding training stress.
Personalised daily protein target adjusted for hormonal and metabolic changes after 40.
Find your ideal fasting window based on your life stage, hormonal phase, and goals.
Track your active fast in real time. See elapsed time, fasting stages, and when your eating window opens.
Find your daily calorie target for fat loss — with a safe deficit, TDEE estimate, and timeline to your goal weight.
Find out how much of your weight is lean tissue versus fat — a smarter measure of body composition than the scale alone.
Calculate your WHR and understand your health risk level based on WHO guidelines — in seconds.
We built My Wellness Calc because health information should be accessible, clear, and free — without ads that block your screen or paywalls that hide your results.
Short quizzes that match you to a protocol — backed by evidence, not guesswork.
Find the intermittent fasting schedule that fits your lifestyle and goals.
FitnessNewFind which heart rate zone — Zone 2, MAF, or higher — suits your goals.
Body & WeightNewClarify whether your priority is fat loss, muscle gain, or recomposition.
NutritionNewFind out if your daily intake matches your body weight, goals, and activity level.
LifestyleNewFind your natural chronotype and get personalised sleep timing recommendations.
Body & WeightNewStalled on the scale? Find out what's most likely causing it.
Evidence-based wellness guides to help you make better decisions.
Step-by-step: find your TDEE, set a safe deficit, and calculate your daily calorie target — with a worked example.
NutritionNewDaily fiber targets by age and gender, best food sources, and signs you're not getting enough.
NutritionNewHow hormonal changes affect fasting after 40, which protocols work best, and what to avoid.