Health & Fitness Calculators
Estimate BMI, calories, energy needs and other adult health and fitness measurements.
About these tools
Health and fitness calculators provide educational estimates for measurements such as BMI, calorie needs, basal metabolic rate, energy expenditure and body composition.
Health formulas describe populations, not individual diagnoses. Age, pregnancy, medical conditions, medications, athletic training and other factors can make a general calculator inappropriate for an individual situation.
Browse Health & Fitness
BMI Calculator
Calculate adult body mass index, BMI category and BMI-based weight range.
Open tool →Calorie Calculator
Estimate daily maintenance calories from resting energy and activity level.
Open tool →TDEE Calculator
Estimate total daily energy expenditure from resting energy and activity.
Open tool →BMR Calculator
Estimate adult resting energy using the Mifflin-St Jeor equation.
Open tool →Body Fat Calculator
Estimate adult body-fat percentage from tape-measure circumferences.
Open tool →Period Calculator
Estimate your next period date and upcoming menstrual cycles.
Open tool →Ovulation Calculator
Estimate ovulation timing, fertile days and your next period.
Open tool →Fertile Window Calculator
Estimate possible fertile windows across upcoming menstrual cycles.
Open tool →Pregnancy Due Date Calculator
Estimate due date, pregnancy week, conception date and days remaining.
Open tool →Pregnancy Week Calculator
Calculate estimated pregnancy week, day and due-date countdown.
Open tool →How calculations and results are handled
Health tools identify the formula or reference used where appropriate and display limitations alongside the result. They are informational tools and do not provide medical diagnosis or treatment.
Each individual tool page explains its own inputs, result and important limitations where additional context is useful.