Health & Fitness Calculators
BMI, BMR, daily calorie targets and healthy weight ranges.
BMI Calculator
Body Mass Index with WHO categories and your healthy weight range.
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Calorie & BMR
Basal metabolic rate (Mifflin-St Jeor) and daily calorie targets by goal.
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Body Fat Calculator
Estimate body-fat percentage with the U.S. Navy tape method.
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Ideal Weight
Healthy target weight from four clinical formulas (Devine, Robinson, Miller, Hamwi).
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Water Intake
Recommended daily water based on weight and activity level.
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Running Pace
Pace, finish time or distance for runs — 5K, 10K, half & full marathon.
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Pregnancy & Due Date
Estimate due date, current week, trimester and key milestones from your last period.
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One-Rep Max (1RM)
Estimate your max lift from reps (Epley & Brzycki) plus a training-percentage table.
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Macro Calculator
Split daily calories into protein, carbs and fat grams for your chosen diet.
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Lean Body Mass
Lean mass and fat mass from the Boer formula using height and weight.
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Calories Burned
Calories burned by activity using MET values, your weight and workout duration.
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Ovulation Calculator
Estimate your ovulation day and most fertile window from your cycle.
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TDEE Calculator
Total daily energy expenditure with cut and bulk calorie targets.
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Waist-to-Hip Ratio
Waist-to-hip ratio and health-risk category by gender.
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Waist-to-Height Ratio
Waist-to-height ratio, a simple cardiometabolic risk indicator.
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Protein Intake Calculator
Daily protein target in grams for your body weight and goal.
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Target Heart Rate
Personalized training heart rate using the Karvonen method.
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Max Heart Rate
Estimated maximum heart rate and training zones by formula.
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Conception Calculator
Estimated conception date, fertile window and due date from your last period.
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Blood Alcohol (BAC)
Estimated blood alcohol content by the Widmark formula.
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Sleep Calculator
Total sleep and 90-minute sleep cycles between bedtime and wake time.
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Steps to Calories
Calories burned and distance walked from your step count.
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VO₂ Max Calculator
Estimate VO₂ max and fitness rating from the Cooper 12-minute run.
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Body Surface Area (BSA)
Body surface area by the Mosteller and Du Bois formulas.
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Weight Loss Goal
Weekly loss and daily calorie deficit to hit a goal weight by a date.
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Calories from Macros
Total calories and split from protein, carb and fat grams.
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Army Body Fat Calculator
Body-fat percentage using the US military tape (circumference) method.
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Pregnancy Weight Gain
Recommended pregnancy weight gain by pre-pregnancy BMI and week.
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Child Height Predictor
Predict a child's adult height from the parents' heights.
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Smoking Cost Calculator
How much smoking costs per day, month, year and over time.
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Keto Macro Calculator
Daily fat, protein and carb grams for a ketogenic diet.
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Alcohol Calories
Calories in an alcoholic drink from volume, ABV and carbs.
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Carb Intake Calculator
Daily carbohydrate target in grams for your weight and activity.
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FFMI Calculator
Fat-free mass index and normalized FFMI from weight, height and body fat.
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Ponderal Index
Ponderal index — a height-adjusted body mass measure.
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BMI Prime Calculator
BMI Prime — your BMI as a ratio to the upper healthy limit.
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Adjusted Body Weight
Ideal and adjusted body weight for clinical dosing.
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Macro Split Calculator
Protein, carb and fat grams from calories and a chosen split.
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Gestational Age Calculator
Weeks pregnant, trimester and due date from your last period.
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Waist Circumference Risk
Health-risk category from waist size using WHO thresholds by gender.
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RMR Calculator
Resting metabolic rate via Mifflin-St Jeor or Katch-McArdle.
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Fat Intake Calculator
Daily fat grams from your calories and target fat percentage.
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Sodium Intake Calculator
Recommended daily sodium limit for your health situation.
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Walking Calories Calculator
Calories burned and distance covered from your walk time and pace.
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