Free practical tools
Simple health, fitness, nutrition, sleep, and body measurement calculators.
Enter values, run the tool, copy the result. Built for people tracking everyday wellness, fitness planning, and basic nutrition estimates.
All tools
Choose a tool
BMI Calculator
Calculate body mass index from height and weight.
BodyBMR Calculator
Estimate basal metabolic rate with the Mifflin-St Jeor equation.
NutritionTDEE Calculator
Estimate total daily energy expenditure from BMR and activity.
NutritionCalorie Deficit Calculator
Estimate daily calories for weight loss targets.
NutritionProtein Intake Calculator
Estimate protein intake from body weight and goal.
NutritionWater Intake Calculator
Estimate daily water intake from weight and activity.
BodyIdeal Weight Calculator
Estimate ideal weight range using height-based formulas.
BodyBody Fat Navy Calculator
Estimate body fat percentage from tape measurements.
BodyWaist to Height Ratio
Calculate waist-to-height ratio.
NutritionMacro Calculator
Split calories into protein, carbs, and fat.
FitnessHeart Rate Zone Calculator
Estimate training zones from age and resting heart rate.
FitnessOne Rep Max Calculator
Estimate one-rep max from weight and repetitions.
FitnessRunning Pace Calculator
Calculate pace from distance and time.
FitnessCalories Burned Calculator
Estimate exercise calories from MET value.
FitnessSteps to Distance Calculator
Estimate walking distance from steps and stride length.
SleepSleep Cycle Calculator
Estimate wake time after sleep cycles.
SleepBedtime Calculator
Estimate bedtime from desired wake time and cycles.
BodyPregnancy Due Date Calculator
Estimate due date from last period date.
BodyBody Surface Area Calculator
Estimate body surface area with Du Bois formula.
FitnessSweat Loss Calculator
Estimate fluid loss from weight change during exercise.
BodyAdvanced BMI Calculator
Calculate body mass index from height and weight. This focused variant is tuned for advanced planning and long-tail workflow searches.
BodyQuick BMR Calculator
Estimate basal metabolic rate with the Mifflin-St Jeor equation. This focused variant is tuned for quick planning and long-tail workflow searches.
NutritionPlanning TDEE Calculator
Estimate total daily energy expenditure from BMR and activity. This focused variant is tuned for planning planning and long-tail workflow searches.
NutritionMobile Calorie Deficit Calculator
Estimate daily calories for weight loss targets. This focused variant is tuned for mobile planning and long-tail workflow searches.
NutritionSmall Business Protein Intake Calculator
Estimate protein intake from body weight and goal. This focused variant is tuned for small business planning and long-tail workflow searches.
NutritionFamily Water Intake Calculator
Estimate daily water intake from weight and activity. This focused variant is tuned for family planning and long-tail workflow searches.
BodyTeam Ideal Weight Calculator
Estimate ideal weight range using height-based formulas. This focused variant is tuned for team planning and long-tail workflow searches.
BodyTravel Body Fat Navy Calculator
Estimate body fat percentage from tape measurements. This focused variant is tuned for travel planning and long-tail workflow searches.
BodyAudit Waist to Height Ratio
Calculate waist-to-height ratio. This focused variant is tuned for audit planning and long-tail workflow searches.
NutritionChecklist Macro Calculator
Split calories into protein, carbs, and fat. This focused variant is tuned for checklist planning and long-tail workflow searches.
FitnessBudget Heart Rate Zone Calculator
Estimate training zones from age and resting heart rate. This focused variant is tuned for budget planning and long-tail workflow searches.
FitnessWeekly One Rep Max Calculator
Estimate one-rep max from weight and repetitions. This focused variant is tuned for weekly planning and long-tail workflow searches.
Body
Body tools
BMI Calculator
Calculate body mass index from height and weight.
BodyBMR Calculator
Estimate basal metabolic rate with the Mifflin-St Jeor equation.
BodyIdeal Weight Calculator
Estimate ideal weight range using height-based formulas.
BodyBody Fat Navy Calculator
Estimate body fat percentage from tape measurements.
BodyWaist to Height Ratio
Calculate waist-to-height ratio.
BodyPregnancy Due Date Calculator
Estimate due date from last period date.
BodyBody Surface Area Calculator
Estimate body surface area with Du Bois formula.
BodyAdvanced BMI Calculator
Calculate body mass index from height and weight. This focused variant is tuned for advanced planning and long-tail workflow searches.
BodyQuick BMR Calculator
Estimate basal metabolic rate with the Mifflin-St Jeor equation. This focused variant is tuned for quick planning and long-tail workflow searches.
BodyTeam Ideal Weight Calculator
Estimate ideal weight range using height-based formulas. This focused variant is tuned for team planning and long-tail workflow searches.
BodyTravel Body Fat Navy Calculator
Estimate body fat percentage from tape measurements. This focused variant is tuned for travel planning and long-tail workflow searches.
BodyAudit Waist to Height Ratio
Calculate waist-to-height ratio. This focused variant is tuned for audit planning and long-tail workflow searches.
Nutrition
Nutrition tools
TDEE Calculator
Estimate total daily energy expenditure from BMR and activity.
NutritionCalorie Deficit Calculator
Estimate daily calories for weight loss targets.
NutritionProtein Intake Calculator
Estimate protein intake from body weight and goal.
NutritionWater Intake Calculator
Estimate daily water intake from weight and activity.
NutritionMacro Calculator
Split calories into protein, carbs, and fat.
NutritionPlanning TDEE Calculator
Estimate total daily energy expenditure from BMR and activity. This focused variant is tuned for planning planning and long-tail workflow searches.
NutritionMobile Calorie Deficit Calculator
Estimate daily calories for weight loss targets. This focused variant is tuned for mobile planning and long-tail workflow searches.
NutritionSmall Business Protein Intake Calculator
Estimate protein intake from body weight and goal. This focused variant is tuned for small business planning and long-tail workflow searches.
NutritionFamily Water Intake Calculator
Estimate daily water intake from weight and activity. This focused variant is tuned for family planning and long-tail workflow searches.
NutritionChecklist Macro Calculator
Split calories into protein, carbs, and fat. This focused variant is tuned for checklist planning and long-tail workflow searches.
Fitness
Fitness tools
Heart Rate Zone Calculator
Estimate training zones from age and resting heart rate.
FitnessOne Rep Max Calculator
Estimate one-rep max from weight and repetitions.
FitnessRunning Pace Calculator
Calculate pace from distance and time.
FitnessCalories Burned Calculator
Estimate exercise calories from MET value.
FitnessSteps to Distance Calculator
Estimate walking distance from steps and stride length.
FitnessSweat Loss Calculator
Estimate fluid loss from weight change during exercise.
FitnessBudget Heart Rate Zone Calculator
Estimate training zones from age and resting heart rate. This focused variant is tuned for budget planning and long-tail workflow searches.
FitnessWeekly One Rep Max Calculator
Estimate one-rep max from weight and repetitions. This focused variant is tuned for weekly planning and long-tail workflow searches.
Sleep
Sleep tools
Guides
Short practical guides
How to choose the right health calculator tools
Pick the fastest tool for the job and avoid common input mistakes.
GuideCommon mistakes with health calculator tools
Review units, assumptions, formats, and edge cases before using results.
GuideWhy browser-based tools are useful
Use lightweight tools for fast calculations, formatting, and planning without account setup.