๐ฅ Health
Free health calculators: BMI, BMR, body fat, calorie tracking, and more. All run locally in your browser.
Turn everyday health questions into instant answers: your BMI, daily calorie needs, body fat percentage, ideal weight, hydration target and more. Every calculator runs entirely in your browser โ no sign-up, no data upload, no waiting.
Use these tools to set realistic fitness goals, sanity-check a diet plan, or walk into your next check-up with better questions. Results are estimates based on published clinical formulas, so treat them as a starting point rather than a diagnosis.
Tools cover body composition, energy and calories, nutrition and hydration, and everyday wellness. Each tool page documents the formula it uses, its data sources and its accuracy limits.
๐ช Fitness & Body Metrics
Army Body Fat Calculator
Free online army body fat calculator. Calculate body fat percentage using the US
BMI Calculator
Calculate your BMI with our free online BMI calculator. Enter height and weight
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) online for free using the Mifflin-St J
Body Fat Calculator
Estimate your body fat percentage online for free. Enter measurements for an app
Healthy Weight Calculator
Find your healthy weight range based on height and frame size. See your BMI-base
Heart Rate Calculator
Free online heart rate calculator. Find your target heart rate zones for cardio
Ideal Weight Calculator
Find your ideal body weight range for free. Calculate healthy weight based on he
Lean Body Mass Calculator
Free online lean body mass calculator. Estimate your LBM using Boer, James, and
One Rep Max Calculator
Free online one rep max calculator. Estimate your 1-repetition maximum using Epl
Pace Calculator
Free online running pace calculator. Calculate your pace per mile or kilometer,
TDEE Calculator
Calculate your Total Daily Energy Expenditure (TDEE) online for free. Enter age,
Waist-Hip Ratio Calculator
Free online waist-hip ratio calculator. Calculate your WHR and assess your healt
Waist-to-Height Ratio Calculator
Calculate your Waist-to-Height Ratio (WHtR) to assess cardiometabolic risk. Ente
๐ฅ Nutrition & Diet
Free Calorie Calculator
Calculate your daily calorie needs with our free Calorie Calculator. Get BMR and
Calorie Deficit Calculator
Free online calorie deficit calculator. Calculate the exact calorie deficit need
Calories Burned Calculator
Calculate calories burned during exercise with our free calculator. Track runnin
Intermittent Fasting Calculator
Intermittent fasting calculator: pick a protocol (16:8, 18:6, 20:4, OMAD) and yo
Japan Salt Intake Calculator
Convert food-label sodium (Na, mg) into salt grams (Na x 2.54) and compare your
Macro Calculator
Calculate your daily macros (protein, carbs, fat) and calorie needs with our fre
Protein Calculator
Calculate your daily protein needs based on weight and activity level. For muscl
Recipe Scaler
Recipe scaler: adjust ingredient amounts when changing recipe servings. Scale up
Water Intake Calculator
Calculate your recommended daily water intake online for free. Find out how much
๐คฐ Pregnancy & Parenting
Baby Growth Percentile Calculator
Check your babyโs growth percentile on WHO charts. Enter age, gender, weight, le
Due Date Calculator
Calculate your estimated due date based on your last menstrual period. Free preg
Ovulation Calculator
Calculate your ovulation date and fertile window with our free calculator. Plan
Period Calculator
Track and predict your menstrual cycle with our free period calculator. Get next
Pregnancy Calculator
Calculate your estimated due date and current pregnancy week with our free pregn
Pregnancy Weight Gain Calculator
Free online pregnancy weight gain calculator based on IOM guidelines. Track your
๐ Everyday Wellness
Frequently asked questions
Are these health calculators free?
Yes. Every tool on Muxtly is free, works without an account, and runs directly in your browser.
Is my health data private?
Completely. All calculations happen locally in your browser โ nothing you type is uploaded or stored on any server.
Which formulas do the calculators use?
Established, published formulas โ for example WHO BMI classifications and widely used metabolic equations. Each tool page lists its exact sources and limitations.
Can these tools replace a doctor?
No. They provide orientation values for healthy adults and cannot consider your medical history. For decisions about your health, always consult a qualified professional.
Do the calculators work on mobile?
Yes. Every page is responsive and works offline once loaded, since the math runs on your device.