Health Tools Calculators

Calculate your Body Mass Index and weight category — underweight, normal, overweight, or obese — based on height and weight.

Estimate your daily calorie needs and weight loss or gain targets using the Mifflin-St Jeor equation — the most accurate formula for the general population.

Estimate your daily water needs in ounces and liters based on body weight and exercise using evidence-based hydration guidelines.

Convert your daily calorie target into specific grams of protein, carbohydrates, and fat for your fitness goal.

Estimate your body fat percentage using the U.S. Navy circumference method — accurate within 3% of DEXA scan results for most adults.

Calculate your ideal body weight using four established medical formulas and find your target weight range.

Calculate your Basal Metabolic Rate — the calories your body burns at complete rest to sustain basic physiological functions.

Calculate your Total Daily Energy Expenditure — the number of calories you burn each day including movement, exercise, and all daily activities.

Calculate your optimal daily protein intake in grams based on your body weight and fitness goal.

Calculate your maximum heart rate and personalized training zones using the Karvonen heart rate reserve formula.

Find ideal bedtimes that align with your natural 90-minute sleep cycles so you wake up refreshed rather than groggy.

Find the healthy weight range for your height based on BMI 18.5–24.9, and see exactly where your current weight falls.

Estimate calories burned for any physical activity using MET (Metabolic Equivalent of Task) values, your weight, and duration.

Estimate your pregnancy due date, gestational age, and trimester from the first day of your last menstrual period.

Estimate your ovulation day and fertile window to understand your fertility pattern and optimize timing for conception.