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Free health calculators
Standard published formulas on the numbers you enter. Not medical or dietary advice.
Health tools
- Daily protein calculatorType your body weight and pick a general or active range to see a daily protein target in grams, backed by published nutrition research.
- GLP-1 protein calculatorA protein calculator with a range for active weight reduction on GLP-1 medicines, cited to a 2025 joint advisory from four U.S. medical societies.
- Daily calorie (TDEE) calculatorEstimate total daily energy expenditure from your age, weight, height and activity level using the Mifflin-St Jeor equation and CDC activity guidance.
- Water intake calculatorTurn your body weight into a daily water range using a common milliliters-per-kilogram rule of thumb, with National Academies figures for context.
- BMI calculatorCalculate adult BMI from your height and weight and see where it falls in the CDC's four BMI categories, with CDC's own caveats about what BMI misses.
- Body fat calculatorEstimate body fat percentage from neck, waist and height — plus hip, for women — using the U.S. Navy circumference method and its published accuracy.
- Fiber intake calculatorTurn your daily calories into a fiber target using the 14-gram-per-1,000-calorie Adequate Intake that most U.S. adults currently fall short of.
- Weight loss percentage calculatorCalculate the percentage of body weight you've lost between two weigh-ins — the measure researchers use instead of raw pounds or kilograms.
- Goal weight timeline calculatorEstimate how many weeks a steady weekly rate would take to close the gap between your current weight and your goal weight, at a pace you set.
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