💪Fitness & Health Calculators
BMI, calorie, pregnancy, body fat, and fitness calculators. Explore our full inventory of 31 verified calculators organized by topic below.
⭐ Featured & Most Used
BMI Calculator
Calculate your Body Mass Index (BMI) to assess if your weight is in a healthy range.
Calorie Calculator
Calculate the number of calories you need daily to maintain, lose, or gain weight.
Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method or BMI Deurenberg equation.
BMR Calculator
Calculate Basal Metabolic Rate (BMR) — the calories your body burns at complete rest.
Pregnancy Calculator
Calculate your due date, week of pregnancy, and key pregnancy milestones from LMP.
Due Date Calculator
Calculate your estimated due date using last menstrual period, conception date, or ultrasound.
TDEE Calculator
Calculate Total Daily Energy Expenditure (TDEE) based on BMR and activity level.
⚖️Body Composition & Weight Assessment(11)
Body fat percentage, BMI benchmarks, lean mass, military body fat, ideal weight, and body frame shape.
BMI Calculator
Calculate your Body Mass Index (BMI) to assess if your weight is in a healthy range.
Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method or BMI Deurenberg equation.
Lean Body Mass Calculator
Calculate lean body mass (fat-free mass) using various body composition formulas.
Army Body Fat Calculator
Calculate body fat percentage using the US Army circumference method (AR 600-9).
Ideal Weight Calculator
Estimate ideal body weight based on height using multiple recognized formulas.
Healthy Weight Calculator
Calculate the healthy BMI weight range for your height.
Body Type Calculator
Determine your body type (ectomorph, mesomorph, endomorph) based on physical measurements.
Body Surface Area Calculator
Calculate body surface area (BSA) using the DuBois, Mosteller, or Haycock formula.
Overweight Calculator
Calculate how much weight you are above or below the healthy BMI range for your height.
Anorexic BMI Calculator
Understand BMI ranges associated with anorexia and the health risks of extremely low BMI.
Weight Watcher Points Calculator
Estimate WW (Weight Watchers) PersonalPoints based on food nutrition values.
🥗Metabolism, Nutrition & Calorie Planning(7)
Basal metabolic rate, total daily energy expenditure, macro ratios, protein needs, and deficit targets.
BMR Calculator
Calculate Basal Metabolic Rate (BMR) — the calories your body burns at complete rest.
Calorie Calculator
Calculate the number of calories you need daily to maintain, lose, or gain weight.
TDEE Calculator
Calculate Total Daily Energy Expenditure (TDEE) based on BMR and activity level.
Macro Calculator
Calculate ideal macronutrient ratios (protein, carbs, fat) for your fitness goals.
Protein Calculator
Calculate your recommended daily protein intake based on weight, activity, and goals.
Carbohydrate Calculator
Calculate recommended daily carbohydrate intake based on caloric goals and activity level.
Fat Intake Calculator
Calculate recommended daily dietary fat intake based on total calorie goals.
🏃Fitness, Cardio & Athletic Performance(4)
Running and walking pace, exercise calorie burn, target heart rate training zones, and 1-rep strength maxes.
Pace Calculator
Calculate running pace, time, or distance. Convert between min/km and min/mile.
Calories Burned Calculator
Calculate calories burned during exercise based on activity type, duration, and body weight.
Target Heart Rate Calculator
Calculate target heart rate zones for aerobic and anaerobic exercise.
One Rep Max Calculator
Estimate your one-rep maximum for weightlifting using multiple established formulas.
👶Pregnancy, Fertility & Clinical Health Metrics(9)
Estimated due date, ovulation windows, pregnancy weight gain, kidney filtration (eGFR), and BAC levels.
Pregnancy Calculator
Calculate your due date, week of pregnancy, and key pregnancy milestones from LMP.
Due Date Calculator
Calculate your estimated due date using last menstrual period, conception date, or ultrasound.
Pregnancy Conception Calculator
Estimate the date of conception based on your due date or last menstrual period.
Pregnancy Weight Gain Calculator
Calculate recommended weight gain during pregnancy based on pre-pregnancy BMI (IOM guidelines).
Ovulation Calculator
Estimate your ovulation date and fertile window based on your menstrual cycle length.
Conception Calculator
Estimate when conception likely occurred based on the due date or last menstrual period.
Period Calculator
Predict future period dates and track menstrual cycle patterns.
GFR Calculator
Estimate Glomerular Filtration Rate (eGFR) using the CKD-EPI 2021 equation to assess kidney function.
BAC Calculator
Estimate Blood Alcohol Content (BAC) using the Widmark formula. For educational purposes only.
📋 Complete A-Z Directory (31)
Browse every fitness & health calculators available on CalculatorDigital.
Anorexic BMI Calculator
Understand BMI ranges associated with anorexia and the health risks of extremely low BMI.
Army Body Fat Calculator
Calculate body fat percentage using the US Army circumference method (AR 600-9).
BAC Calculator
Estimate Blood Alcohol Content (BAC) using the Widmark formula. For educational purposes only.
BMI Calculator
Calculate your Body Mass Index (BMI) to assess if your weight is in a healthy range.
BMR Calculator
Calculate Basal Metabolic Rate (BMR) — the calories your body burns at complete rest.
Body Fat Calculator
Estimate body fat percentage using the US Navy circumference method or BMI Deurenberg equation.
Body Surface Area Calculator
Calculate body surface area (BSA) using the DuBois, Mosteller, or Haycock formula.
Body Type Calculator
Determine your body type (ectomorph, mesomorph, endomorph) based on physical measurements.
Calorie Calculator
Calculate the number of calories you need daily to maintain, lose, or gain weight.
Calories Burned Calculator
Calculate calories burned during exercise based on activity type, duration, and body weight.
Carbohydrate Calculator
Calculate recommended daily carbohydrate intake based on caloric goals and activity level.
Conception Calculator
Estimate when conception likely occurred based on the due date or last menstrual period.
Due Date Calculator
Calculate your estimated due date using last menstrual period, conception date, or ultrasound.
Fat Intake Calculator
Calculate recommended daily dietary fat intake based on total calorie goals.
GFR Calculator
Estimate Glomerular Filtration Rate (eGFR) using the CKD-EPI 2021 equation to assess kidney function.
Healthy Weight Calculator
Calculate the healthy BMI weight range for your height.
Ideal Weight Calculator
Estimate ideal body weight based on height using multiple recognized formulas.
Lean Body Mass Calculator
Calculate lean body mass (fat-free mass) using various body composition formulas.
Macro Calculator
Calculate ideal macronutrient ratios (protein, carbs, fat) for your fitness goals.
One Rep Max Calculator
Estimate your one-rep maximum for weightlifting using multiple established formulas.
Overweight Calculator
Calculate how much weight you are above or below the healthy BMI range for your height.
Ovulation Calculator
Estimate your ovulation date and fertile window based on your menstrual cycle length.
Pace Calculator
Calculate running pace, time, or distance. Convert between min/km and min/mile.
Period Calculator
Predict future period dates and track menstrual cycle patterns.
Pregnancy Calculator
Calculate your due date, week of pregnancy, and key pregnancy milestones from LMP.
Pregnancy Conception Calculator
Estimate the date of conception based on your due date or last menstrual period.
Pregnancy Weight Gain Calculator
Calculate recommended weight gain during pregnancy based on pre-pregnancy BMI (IOM guidelines).
Protein Calculator
Calculate your recommended daily protein intake based on weight, activity, and goals.
Target Heart Rate Calculator
Calculate target heart rate zones for aerobic and anaerobic exercise.
TDEE Calculator
Calculate Total Daily Energy Expenditure (TDEE) based on BMR and activity level.
Weight Watcher Points Calculator
Estimate WW (Weight Watchers) PersonalPoints based on food nutrition values.
Fitness & Health Calculators FAQs
Are the health calculators medically accurate?
All health and fitness tools on CalculatorDigital use established scientific formulas (e.g. Mifflin-St Jeor for BMR, US Navy method for body fat, Naegele's rule for due date). They are estimation tools — always consult a healthcare professional for medical decisions.
Which health calculators are most used?
The most popular health tools are the BMI Calculator, Body Fat Calculator, BMR Calculator, Calorie Calculator, and Ideal Weight Calculator. All use established formulas and are free to use.
Can I use these tools for weight loss planning?
Yes. Tools like the BMR Calculator (resting calories), TDEE Calculator (total daily burn), Calorie Calculator (daily needs), and Macro Calculator (protein/carb/fat targets) work well together for planning a calorie deficit or nutrition goal.