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.
Estimate your VO2 max from a field test and see your fitness category by age — the most powerful predictor of cardiovascular health.
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.
Estimate how much VO2 max and strength you lose during a break from training — and how many weeks of retraining it takes to get back.
Find how much moderate activity your sitting load calls for, how big the gap is, and how often to break up sitting.
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 your daily calorie target for building muscle — with a controlled surplus, TDEE estimate, and fat-gain assessment.
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.
Find your Fat-Free Mass Index and normalized FFMI — a far better measure of muscularity than BMI.
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 your realistic starting level and get a plan matched to it.
LifestyleYou exercise — but what about the other ten hours? Find your movement profile.
FitnessResume, rebuild, or restart? Find your comeback approach.
NutritionFind the intermittent fasting schedule that fits your lifestyle and goals.
NutritionFind out if your daily intake matches your body weight, goals, and activity level.
Body & WeightStalled on the scale? Find out what's most likely causing it.
Evidence-based wellness guides to help you make better decisions.
What your morning HRV reading should mean for today's Zone 2 session — and how Zone 2 improves HRV over time.
FitnessMatch your specific mismatch to its cause — from warm-up fatigue to rep-range error — plus how to test a true max safely.
NutritionThe per-meal protein threshold that reduces hunger, the best sources for it, and why you might still be hungry despite hitting your target.