Health & Fitness Calculators

Estimate the everyday numbers of health and training: body composition, daily calorie needs, macro splits and gym maxes, plus cycle-based due-date and ovulation estimates. Each page explains the formula behind the figure and its limits — these are population-level estimates, not medical advice.

• BMI CalculatorCalculate your body mass index (BMI) from your weight and height.
• BMR CalculatorEstimate your basal metabolic rate — the calories your body burns at complete rest.
• TDEE Calculator — Daily Calorie NeedsEstimate the calories you burn per day from your BMR and activity level.
• Ideal Weight CalculatorEstimate an ideal body weight from height and sex using the Devine formula.
• Water Intake CalculatorA daily drinking-water estimate from your body weight and exercise time.
• Body Fat Calculator (US Navy Method)Estimate body fat percentage from tape measurements using the US Navy circumference formula.
• Macro CalculatorSplit daily calories into grams of protein, carbs and fat at your chosen percentages.
• One Rep Max CalculatorEstimate your one-rep max from a weight and rep count, with common training percentages.
• Pregnancy Due Date CalculatorEstimate a due date from the first day of the last menstrual period, adjusted for cycle length.
• Ovulation CalculatorEstimate your ovulation date and fertile window from your last period and cycle length.