Body composition & ideal weight
Evaluate body mass index, body fat percentages, and healthy weight ranges.
Health & Fitness
12 toolsEstimate everyday health and fitness metrics with clear inputs and results.
Popular Health & Fitness tools
Start with the tools people use most often in this category.
Universal BMI CalculatorCalculate Body Mass Index (BMI) with both Imperial (lbs/feet) and Metric (kg/cm) units.Calorie CalculatorEstimate your daily calorie needs to maintain, lose, or gain weight based on body stats and activity level. Uses the Mifflin-St Jeor formula.TDEE CalculatorCalculate your Total Daily Energy Expenditure (TDEE) — total calories burned per day including activity, NEAT, and digestion. Your true maintenance calorie level.BMR CalculatorCalculate your Basal Metabolic Rate (BMR) — the minimum calories your body needs at complete rest. Uses the accurate Mifflin-St Jeor equation.Ideal Weight CalculatorCalculate your healthy ideal weight range using 4 clinical medical formulas (Devine, Robinson, Miller, Hamwi) and WHO BMI guidelines.
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Calories, metabolism & macros
Estimate daily calorie burn, basal metabolic rates, and nutrient splits.
Daily wellness & milestones
Track daily hydration targets, running paces, and pregnancy delivery milestones.
All Health & Fitness Tools
Showing 12 toolsWater Intake Calculator
Estimate daily water intake from your body weight and exercise time.
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Breathing Exercises
Follow timed breathing exercises with guided inhale, hold, and exhale phases.
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Ambient Sound Mixer & Relaxation
Mix soothing ambient sounds like rain, ocean waves, campfire, and wind with calming animated backgrounds to focus, meditate, or fall asleep.
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BMR Calculator
Calculate your Basal Metabolic Rate (BMR) — the minimum calories your body needs at complete rest. Uses the accurate Mifflin-St Jeor equation.
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TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) — total calories burned per day including activity, NEAT, and digestion. Your true maintenance calorie level.
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US Navy Body Fat Calculator
Estimate body fat percentage and lean body mass using the official U.S. Navy circumference method. More accurate than BMI for assessing body composition.
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Calorie Calculator
Estimate your daily calorie needs to maintain, lose, or gain weight based on body stats and activity level. Uses the Mifflin-St Jeor formula.
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Universal BMI Calculator
Calculate Body Mass Index (BMI) with both Imperial (lbs/feet) and Metric (kg/cm) units.
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Running Pace Calculator
Calculate running pace, finish time, and distance for 5k, 10k, half marathon, and marathon.
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Ideal Weight Calculator
Calculate your healthy ideal weight range using 4 clinical medical formulas (Devine, Robinson, Miller, Hamwi) and WHO BMI guidelines.
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Macro Calculator
Calculate your daily macronutrient breakdown (protein, carbs, fats) and calorie targets for weight loss, maintenance, or muscle gain.
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Pregnancy Due Date Calculator
Estimate your baby delivery due date, current gestational age, trimesters, and key developmental milestones from LMP, conception, or IVF.
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About Health & Fitness tools
UsefulGo health and fitness calculators provide quick estimates for daily calorie needs, metabolic rates, body mass index, and hydration targets. All calculations are processed privately on your device. These tools are intended for general fitness and wellness educational purposes, and do not replace personalized medical advice from healthcare professionals.
Frequently asked questions
What is the difference between BMR and TDEE?
BMR (Basal Metabolic Rate) is the baseline calories your body burns at complete rest to sustain vital functions. TDEE (Total Daily Energy Expenditure) accounts for your BMR plus physical activity and exercise, representing your actual daily maintenance calories.
How reliable is BMI for measuring fitness?
BMI (Body Mass Index) is a useful screening tool comparing weight to height. However, it does not differentiate between muscle mass and body fat. For a more comprehensive picture, consider pairing BMI with our Body Fat and Ideal Weight calculators.
How do I determine a healthy calorie deficit for weight loss?
A safe and sustainable deficit is typically 300 to 500 calories below your calculated TDEE, supporting gradual weight loss of about 0.5 to 1 lb (0.25 to 0.5 kg) per week without excessive hunger or muscle loss.
Are my personal health measurements private?
Yes. All health calculators run entirely locally in your web browser. No personal health metrics, weights, heights, or ages are ever sent to or stored on our servers.