23 free calculators for body composition, nutrition, heart rate training, fasting, and more. Instant results — no sign-up required.
Assess your health risk by calculating your waist-to-hip ratio with guidance on what your result means.
Body & WeightNewFind out how much of your weight is muscle and lean tissue — a smarter measure than the scale alone.
Body & WeightNewFind your daily calorie deficit target to hit your weight loss goal at a safe, sustainable pace.
Body & WeightCalculate your Body Mass Index and understand what it means for your health.
Body & WeightEstimate your body fat percentage using measurements — no equipment needed.
Body & WeightSee your ideal weight range based on height, gender, and multiple established formulas.
NutritionFind your daily calorie needs based on your stats and activity level.
NutritionGet your personalized protein, carbs, and fat targets for your goal.
NutritionCalculate how much protein you need daily based on your weight, goal, and activity.
NutritionProtein needs change after 40. Get a recommendation tailored to your age and stage.
NutritionFind out how much vitamin D you need daily based on your age, location, and lifestyle.
FitnessFind your 5 heart rate training zones to optimize every workout.
FitnessCalculate your Zone 2 heart rate range for aerobic base building and fat burning.
FitnessUse the 180 Formula to find your MAF training heart rate for aerobic development.
FitnessFind your Zone 1 active recovery heart rate to recover faster between hard sessions.
FitnessEstimate calories burned during exercise using your heart rate and workout duration.
FitnessEstimate your 1RM for any lift and calculate training percentages.
FitnessCalculate your running pace, finish time, or target distance for any race.
LifestylePlan your fasting and eating windows for 16:8, 18:6, OMAD, and other IF protocols.
LifestyleA fasting planner tailored for women, accounting for hormonal cycles and specific needs.
LifestyleTrack your current fast in real time with a simple countdown timer.
LifestyleFind out how much water you should drink each day based on your weight and activity.
LifestyleFind the best bedtime or wake-up time based on sleep cycles for better rest.