Health Calculators

Free online Health calculators and tools.

Blood Alcohol Content (BAC) EstimatorEstimate blood alcohol content using the Widmark formula.Blood Pressure Category CalculatorClassifies a blood pressure reading into a general category based on commonly published systolic/diastolic thresholds.BMI CalculatorCalculate your Body Mass Index (BMI) from height and weight and see your weight category.BMR Calculator (Basal Metabolic Rate)Calculate your Basal Metabolic Rate (BMR) — the calories your body burns at rest — using the Mifflin-St Jeor equation.Body Adiposity Index (BAI) CalculatorEstimate body fat percentage using the Body Adiposity Index formula, without needing a scale.Body Fat Percentage CalculatorEstimate your body fat percentage from BMI, age and sex using the Deurenberg formula.Calorie Deficit for Weight Loss CalculatorCalculates the daily calorie deficit and target daily calories needed to reach a chosen weekly weight loss goal.Calories Burned by MET Value CalculatorEstimates calories burned during an activity using its MET (metabolic equivalent) value, your body weight and duration.HbA1c to Average Glucose CalculatorConvert an HbA1c percentage to an estimated average blood glucose level.Heart Rate Zone CalculatorCalculate your target heart rate zones for moderate and vigorous exercise using the Karvonen method.Hydration Needs by Weight CalculatorEstimates a general daily water intake target based on your body weight.Ideal Body Weight CalculatorEstimate ideal body weight from height and sex using the Devine formula.Lean Body Mass CalculatorEstimate lean body mass and fat mass from weight, height and sex using the Boer formula.Macronutrient (Macro) Split CalculatorCalculate daily protein, carbohydrate and fat targets in grams from your calorie goal and macro percentages.Ovulation Window CalculatorEstimates your likely ovulation day and fertile window from the start of your last period and average cycle length.Pregnancy Due Date CalculatorEstimates your baby's due date and current weeks pregnant from the first day of your last menstrual period.Pregnancy Weight Gain CalculatorEstimate a healthy pregnancy weight gain range based on your pre-pregnancy BMI.Protein Intake CalculatorEstimates daily protein intake target based on body weight and activity level.Recommended Daily Fiber Intake CalculatorEstimates a general daily dietary fiber target based on commonly published age and sex guidelines.RMR Calculator (Katch-McArdle Formula)Estimate your Resting Metabolic Rate using the Katch-McArdle formula, based on lean body mass.Skinfold Body Fat Percentage Calculator (Jackson-Pollock 3-Site)Estimate body fat percentage from three skinfold measurements using the Jackson-Pollock formula.Sleep Cycle Bedtime CalculatorWorks backward from your wake-up time to suggest a bedtime aligned with complete 90-minute sleep cycles.Sweat Rate Calculator (Athlete Hydration)Estimate your sweat rate during exercise from your pre- and post-exercise body weight.TDEE Calculator (Total Daily Energy Expenditure)Calculate your Total Daily Energy Expenditure (TDEE) — the calories you burn per day including activity.Waist Circumference Health Risk CalculatorCheck your waist circumference against general health risk thresholds.Waist-to-Height Ratio CalculatorCalculates your waist-to-height ratio and a general risk category, a simple alternative to BMI for assessing central body fat.Waist-to-Hip Ratio CalculatorCalculate your waist-to-hip ratio and see your general health risk category based on WHO guidance.
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