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BMR Calculator
Free BMR calculator using the Mifflin-St Jeor equation — the formula recommended by the Academy of Nutrition and Dietetics. Get your basal metabolic rate plus TDEE across five activity levels.
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Calorie Calculator
Calculate your daily calorie needs based on the Mifflin-St Jeor equation and USDA Dietary Guidelines activity factors. Get targets for weight loss, maintenance, or weight gain.
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Body Fat Calculator
Free body fat percentage calculator using the US Navy circumference method (Hodgdon-Beckett, 1984). Validated within ±3–4% of hydrostatic weighing — the lab reference standard.
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Water Intake Calculator
Free water intake calculator based on the National Academies (NASEM/IOM) Adequate Intake recommendations: 125 oz/day for men and 91 oz/day for women, including water from food and beverages.
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Pregnancy Due Date Calculator
Free pregnancy due date calculator using ACOG Committee Opinion 700 — Naegele's rule (LMP + 280 days), conception date, or first-trimester ultrasound. Includes weekly milestones.
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Ovulation Calculator
Free ovulation calculator using ACOG and ASRM guidance. Predicts your ovulation day, six-day fertile window, and the highest-probability conception days based on cycle length.
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Blood Pressure Calculator
Free blood pressure calculator using the 2017 ACC/AHA hypertension guideline. Categorize systolic and diastolic readings into normal, elevated, stage 1, stage 2, or hypertensive crisis.
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BAC Calculator
Free Blood Alcohol Content (BAC) calculator using the Widmark formula. Estimate your BAC after drinking and time until 0.00 — for educational use only, not legal proof of sobriety.
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Sleep Calculator
Find the best bedtime or wake-up time using 90-minute sleep cycles. Based on the National Sleep Foundation recommendation of 7–9 hours and 5–6 complete cycles per night.
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Protein Intake Calculator
Free protein intake calculator using USDA, ACSM, and ISSN guidelines. Get a personalized daily target in grams based on body weight, activity level, age, and goal (muscle, fat loss, longevity).
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Food Calorie Calculator
Free food calorie calculator with USDA FoodData Central values. Look up calories per serving for common foods, fast food, and restaurant items. Accurate for tracking and meal planning.
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BMI Calculator
Free BMI calculator for adults using CDC and NIH categories. Enter height and weight in metric or US units to find your Body Mass Index, weight class (underweight, healthy, overweight, obesity I–III), and a healthy reference weight.
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Macronutrient Calorie Calculator
Free macronutrient calorie calculator using Atwater factors (4/4/9 kcal/g) per USDA FoodData Central. Convert grams of carbs, protein, fat, and alcohol into calories with percentage split.