Fitness & Health Calculators

BMI, calorie needs, body fat, ideal weight, pregnancy and more. Formulas follow CDC and WHO guidance and widely used equations such as Mifflin-St Jeor – screening estimates, not medical diagnosis.

• BMI Calculator

  Body Mass Index with WHO category and healthy weight range.

• Calorie Calculator

  Daily calories to maintain, lose or gain weight.

• BMR Calculator

  Basal Metabolic Rate by two scientific formulas.

• Body Fat Calculator

  Body fat percentage using the U.S. Navy method.

• Ideal Weight Calculator

  Ideal body weight by four popular formulas.

• Lean Body Mass Calculator

  Weight of everything except body fat (Boer formula).

• Target Heart Rate Calculator

  Max heart rate and training zones (Karvonen).

• Water Intake Calculator

  How much water to drink per day.

• Protein Calculator

  Daily protein needs by activity and goal.

• Running Pace Calculator

  Pace per km/mile and speed from distance and time.

• Pregnancy Due Date Calculator

  Estimated due date from the last menstrual period.

• Ovulation Calculator

  Estimate ovulation day and fertile window.

• Age Calculator

  Exact age in years, months, days and more.