Health & Fitness Calculators

Understand your body and set realistic fitness goals with clear, evidence-based numbers — not guesswork.

These tools provide estimates based on established formulas — they are not a substitute for professional medical advice.

BMI Calculator

Calculate your Body Mass Index and see which weight category it falls into, based on your height and weight.

Find your daily calorie needs for maintaining, losing, or gaining weight based on your activity level.

Split your daily calorie target into grams of protein, carbs, and fat based on your goal.

Estimate your body fat percentage using the U.S. Navy circumference method.

Find out how much water you should drink daily based on your weight and activity level.

Estimate a healthy weight range for your height using several established medical formulas.

Find your maximum heart rate and training zones for fat burning, cardio, and peak performance.

Estimate your due date and current week of pregnancy based on your last menstrual period.

Calculate your Total Daily Energy Expenditure using multiple BMR formulas and your activity level.

Estimate your one-rep max from a submaximal lift using Epley, Brzycki, and Lombardi formulas.

Calculate running or walking pace, speed, distance, or finish time for any race distance.

Estimate your Blood Alcohol Content based on drinks consumed, body weight, sex, and time elapsed.

Predict your next period, ovulation window, and fertile days based on your cycle length.