Health & Fitness Calculators

BMI calculator, calorie counter, body fat percentage, and more.

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Showing 48 of 48 calculators

BMI Calculator

Calculate your Body Mass Index (BMI) instantly with our free calculator. Enter your height and weight to find your BMI category and health range.

Kids BMI

Calculate your child's BMI and percentile ranking using age and sex-specific CDC growth charts for ages 2-20.

Calorie Calculator

Estimate your daily calorie needs for weight loss, maintenance, or gain based on age, sex, height, weight, and activity level.

BMR Calculator

Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation to find how many calories your body burns at rest.

TDEE Calculator

Calculate your Total Daily Energy Expenditure based on BMR and activity level to plan your diet and fitness goals.

Macro Calculator

Calculate your daily macronutrient targets for protein, carbs, and fat based on your calorie goal and diet type.

Calorie Deficit

Calculate your daily calorie deficit needed to reach your goal weight within your desired timeframe.

Weight Loss

Estimate how long it will take to reach your goal weight based on your TDEE and chosen weekly loss rate.

Body Fat

Estimate your body fat percentage using the U.S. Navy circumference method with waist, neck, and hip measurements.

Ideal Weight

Find your ideal body weight using the Devine, Robinson, Miller, and Hamwi formulas based on your height and sex.

Protein Calculator

Calculate your recommended daily protein intake based on body weight, activity level, and fitness goals.

Water Intake

Calculate how much water you should drink daily based on your body weight, activity level, and climate conditions.

Due Date

Estimate your baby's due date based on your last menstrual period or conception date using Naegele's rule.

Period Calculator

Predict your next period date, fertile window, and ovulation day based on your menstrual cycle length.

Pregnancy Tracker

Track your pregnancy progress including current week, trimester, and weeks remaining based on your due date.

BAC Calculator

Estimate your blood alcohol content (BAC) based on drinks consumed, body weight, sex, and time elapsed.

Blood Type

Predict possible blood types for a child based on the parents' ABO and Rh blood type combinations.

Bedtime Calculator

Find the best bedtime based on your wake-up time and 90-minute sleep cycles so you wake up refreshed.

Pace Calculator

Calculate your running or walking pace, speed, and finish time for any distance from 5K to marathon.

One Rep Max

Estimate your one-rep max for any lift using the Epley and Brzycki formulas based on weight and reps performed.

Bench Press

Calculate your bench press one-rep max and see how your strength compares to standard benchmarks by body weight.

Target Heart Rate

Calculate your target heart rate zones for fat burn, cardio, and peak training based on your age.

Wilks Score

Calculate your Wilks score to compare powerlifting strength across different body weight classes and sexes.

Ibuprofen Dosage

Calculate the recommended ibuprofen dosage for children and adults based on body weight and age. Consult your doctor.

Tylenol Dosage

Calculate the proper Tylenol (acetaminophen) dosage for children and adults by weight. Always consult your doctor.

Benadryl Dosage

Calculate the recommended Benadryl (diphenhydramine) dose for children and adults by body weight. Consult your doctor.

Baby Formula

Calculate how much formula your baby needs per day and per feeding based on weight and age in months.

Height Predictor

Predict your child's adult height using the mid-parent formula based on mother's and father's heights.

Calories Burned

Estimate how many calories you burn during exercise based on activity type, duration, and body weight using MET values.

Walking Calories

Calculate calories burned while walking based on your weight, distance or duration, and walking speed.

Steps to Calories

Convert your daily step count into estimated calories burned based on body weight and stride length.

Activity Calories

Look up calories burned for 50+ activities using MET values based on your body weight and exercise duration.

BAC Estimator

Estimate blood alcohol content using the Widmark formula with drink count, weight, sex, and drinking duration.

Medication Dosage

Calculate weight-based medication doses for common OTC medications with maximum daily dose limits. Consult your doctor.

Pregnancy Weight

Calculate recommended pregnancy weight gain based on pre-pregnancy BMI using Institute of Medicine guidelines.

Growth Percentile

Estimate your child's weight and height percentile ranking using CDC growth chart data for ages 2-20.

Sleep Calculator

Find out how much sleep you need by age and calculate optimal bedtimes based on 90-minute sleep cycles.

Waist-Hip Ratio

Calculate your waist-to-hip ratio to assess health risk from abdominal fat using WHO classification guidelines.

Lean Body Mass

Calculate your lean body mass and fat mass using body fat percentage or the Boer formula with height and weight.

Keto Macros

Calculate your keto diet macros with 70-75% fat, 20% protein, and 5% carbs based on your calorie needs.

IF Calculator

Plan your intermittent fasting schedule with eating windows, meal timing, and calorie distribution by protocol.

Vitamin D

Estimate your daily vitamin D supplement needs based on current blood levels, target level, and body weight.

Blood Pressure

Check your blood pressure category (normal, elevated, or hypertension) based on AHA systolic and diastolic readings.

Creatinine Clearance

Estimate creatinine clearance (kidney function) using the Cockcroft-Gault equation with age, weight, and serum creatinine.

Smoking Cost

Calculate how much money you spend on cigarettes daily, monthly, yearly, and over your lifetime of smoking.

Protein Intake

Determine your optimal daily protein intake by body weight, activity level, age, and fitness goal for peak performance.

Noise Reduction

Calculate effective noise protection level and safe exposure time using your hearing protector's NRR rating.

Heat Stroke Risk

Assess heat stroke risk based on temperature, humidity, and activity level to determine safe outdoor activity duration.