Health & Fitness Calculators
50 free, science-backed calculators covering nutrition, fitness, hydration, and wellness.
Nutrition
14Daily Calorie Intake Calculator
Estimate your daily caloric needs based on age, gender, weight, height, and activity level.
Macronutrient Split Calculator
Calculate daily protein, carbs, and fat percentages based on total calories.
Daily Nutrient Intake Calculator
Calculate recommended daily intake of essential nutrients like vitamins and minerals.
Meal Portion Size Planner
Determine appropriate portion sizes for meals based on caloric and macronutrient goals.
Sugar Intake Tracker
Track daily sugar consumption and compare it to recommended limits.
Food Calorie Counter
Input meals and calculate total calories consumed daily.
Fiber Intake Calculator
Estimate daily fiber needs and track intake from meals.
Sodium Intake Monitor
Track sodium consumption and ensure it stays within healthy limits.
Protein Requirement Estimator
Calculate daily protein needs based on weight, activity level, and fitness goals.
Healthy Snack Planner
Recommend healthy snack options that fit dietary preferences and goals.
Recipe Nutrition Analyzer
Analyze the nutritional content of recipes and suggest healthier alternatives.
Basal Metabolic Rate (BMR) Calculator
Find out the absolute minimum number of calories your body needs to function at rest.
Intermittent Fasting Schedule Planner
Plan your fasting and eating windows based on popular intermittent fasting protocols like 16/8.
Keto Diet Macro Calculator
Instantly calculate the exact grams of fats, proteins, and net carbs needed to maintain ketosis.
Hydration
3Water Intake Tracker
Calculate and track your recommended daily water intake based on body weight and activity level.
Hydration Percentage Estimator
Estimate hydration levels and get alerts if dehydrated.
Hydration Needs Based on Diet
Calculate hydration needs based on dietary factors like caffeine, alcohol, and sodium intake.
Fitness
11Step Goal and Walking Distance Calculator
Convert steps into distance walked and set daily step goals for fitness.
Heart Rate Zone Calculator
Calculate target heart rate zones for optimal exercise intensity.
Workout Recovery Time Calculator
Estimate recovery time needed after intense workouts.
Protein Requirement Estimator
Calculate daily protein needs based on weight, activity level, and fitness goals.
Body Fat Percentage Estimator (Navy Method)
Estimate your body fat percentage using standard tape measurements (waist, neck, hips).
Walking & Running Calorie Burner
Calculate exact calories burned during your walk or run based on pace and duration.
One-Rep Max (1RM) Estimator
Calculate the maximum weight you can lift for a single rep based on your current lifting performance.
Running Pace Calculator
Determine the exact pace needed to reach your target time for a 5K, 10K, Half Marathon, or Marathon.
Lean Body Mass Calculator
Calculate your lean body mass vs fat mass based on your total body weight and body fat percentage.
Calories Burned by Activity Calculator
Calculate exact calories burned across dozens of different sports, workouts, and daily household activities.
Weight Loss Timeframe Estimator
Find out exactly how many weeks it will take to reach your goal weight based on your target loss rate.
Wellness
12Sleep Duration and Quality Calculator
Recommend ideal sleep duration and track bedtime/wake-up times for better rest.
Stress Level Assessment Tool
Assess stress levels with a questionnaire and get tips for stress management.
Mindful Breathing Timer
Guide breathing exercises with customizable timers for relaxation or focus.
Posture Correction Reminder
Track sitting time and remind users to correct posture or take breaks.
Mental Health Mood Tracker
Log daily mood ratings and activities to identify patterns and triggers.
Caffeine Half-Life & Sleep Calculator
Calculate remaining caffeine in your system at bedtime to avoid sleep disruption.
20-20-20 Eye Health Timer
Protect your eyes from digital strain with a guided 20-minute timer and break reminders.
Quit Smoking Savings Calculator
Calculate how much money you will save over time and track health milestones after quitting smoking.
Vitamin D Sun Exposure Estimator
Estimate the optimal minutes of sun exposure needed for Vitamin D synthesis based on skin type and UV index.
Caffeine Safe Limit Calculator
Calculate your absolute safe maximum daily caffeine limit based on your body weight and sensitivity.
Sleep Cycle (REM) Wake-Up Calculator
Find the perfect times to fall asleep so you wake up refreshed between REM sleep cycles.
Alcohol Calorie Equivalent Calculator
Convert the empty calories from your drinks into their equivalent amounts of junk food.
Health
11Body Mass Index (BMI) Calculator
Calculate your BMI based on height and weight to assess your health status.
Menstrual Cycle and Ovulation Tracker
Predict menstrual cycle phases and ovulation dates for fertility planning.
Alcohol Consumption and BAC Calculator
Estimate blood alcohol content and safe drinking limits.
Ideal Body Weight Calculator
Estimate your ideal healthy weight range based on your height and gender.
Pregnancy Due Date Estimator
Calculate your estimated due date and current trimester based on the first day of your last period.
A1C to Blood Sugar (eAG) Converter
Easily convert your A1C percentage into an Estimated Average Glucose (mg/dL) reading.
Blood Donation Eligibility Calculator
Find out exactly when you are eligible to safely donate whole blood again based on your last donation.
Ovulation & Fertility Window Calculator
Estimate your most fertile days and expected ovulation date to maximize chances of conception.
Pregnancy Weight Gain Calculator
Find the medically recommended weight gain range for your pregnancy based on your starting BMI.
Waist-to-Hip Ratio (WHR) Calculator
Assess your cardiovascular health risk by calculating the ratio of your waist to your hip circumference.
Cholesterol Ratio Calculator
Evaluate your heart health by calculating your Total Cholesterol to HDL ratio and estimating LDL.