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.
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.
Evidence-based wellness guides to help you make better decisions.
BMI is widely used but often misunderstood. Here's what your number really tells you — and what it doesn't.
FastingThe 16:8 method explained simply — what happens in your body, who it's for, and how to start today.
HydrationThe "8 glasses a day" rule isn't one-size-fits-all. Here's the science behind personalized hydration.