Health & Fitness Calculators

Calculate your Body Mass Index and find out your weight category.

Estimate your daily calorie needs based on your age, weight, height, and activity level.

Estimate your body fat percentage using the U.S. Navy method.

Calculate your estimated due date based on your last menstrual period.

Calculate your Total Daily Energy Expenditure based on activity level.

Calculate your daily protein, carbs, and fat targets based on your goals.

Calculate running or walking pace, time, or distance.

Calculate how much water you should drink daily based on your weight and activity.

Find optimal bedtime or wake-up time based on 90-minute sleep cycles.

Estimate your one-rep max from the weight and reps of a working set.

Convert dog years to human years using the scientifically accurate logarithmic formula.

Track your pregnancy week by week with baby size, development milestones, and symptoms.

Calculate how much food to feed your dog daily based on weight, age, and activity level.

Calculate your ideal weight range using Devine, Robinson, Miller, and Hamwi formulas.

Estimate your blood alcohol concentration based on drinks, weight, and time.

Estimate your conception date and fertile window from due date or last period.

Calculate your 5 heart rate training zones for optimal cardio workouts.

Calculate your daily macros for a ketogenic diet based on your profile and goals.

Plan your intermittent fasting schedule with eating and fasting windows.

Predict your ovulation date, fertile window, and next period.

Check your blood pressure category and get health recommendations.

Calculate your lean body mass and fat mass from body fat or body measurements.

Calculate your Fat-Free Mass Index to evaluate muscular development relative to height.

Estimate your VO2 max using the Cooper 12-minute run or 1.5-mile run test.

Calculate your optimal daily protein intake based on weight, activity level, and fitness goal.

Calculate recommended pregnancy weight gain based on IOM guidelines and pre-pregnancy BMI.

Estimate your BAC and how long until you are sober using the Widmark formula.

Estimate your biological age based on exercise, sleep, diet, stress, and BMI.

Calculate how long caffeine stays in your body and when it's safe to sleep using the 5-hour half-life formula.

Calculate medication dosage by body weight using mg/kg dosing for common medications.

Calculate wheelchair ramp length from height using ADA-compliant 1:12 and commercial 1:16 slope ratios.

Calculate safe noise exposure time at given decibel levels using NIOSH and OSHA standards.

Calculate 5 training pace zones from a race time or threshold pace using the Jack Daniels VDOT system.

Calculate 7 power training zones from your FTP using the Coggan power zone model.

Calculate swim pace per 100m or 100yd and estimate times for various distances from a known time.

Check blood type donor and recipient compatibility for all ABO and Rh blood types.

Calculate your due date from IVF embryo transfer date for 3-day or 5-day embryo transfers.

Estimate your body frame size and ideal weight range from wrist circumference and height.

Calculate BMI for children and teens aged 2-19. Learn about BMI percentiles, CDC growth charts, age-specific interpretation, and when to con...

Calculate BMI specifically interpreted for men. Learn about healthy BMI ranges for males, how muscle mass affects BMI readings, visceral fat...

Calculate BMI specifically interpreted for women. Learn about healthy BMI ranges for females, body composition differences, waist-to-hip rat...

Calculate your daily calorie needs for a muscle-building bulk. Learn about caloric surplus for muscle gain (+250-500 cal), lean bulk vs dirt...

Calculate your ideal calorie deficit for safe, sustainable weight loss. Learn how a 500-1000 calorie daily deficit leads to 1-2 lbs per week...

Convert calories for any food weight to calories per 100g, per ounce, and per gram. Classify food energy density with our free calculator.

Calculate calories per serving from total recipe calories and number of servings. Break down protein, carbs, and fat per serving with our fr...

Calculate your daily calorie needs during pregnancy. Learn about trimester-specific calorie increases (+0/+340/+450), key nutrients, healthy...

Calculate how much protein to eat per meal based on your daily goal and number of meals. Get per-meal targets with min/max recommendations f...

Calculate steps per mile and steps per km from your total steps and distance. Estimate calories burned and stride length with our free calcu...

Calculate exactly how many calories you should eat per day to lose weight at a sustainable rate of 1-2 lbs per week. Includes macros for wei...