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Health & Fitness Calculators
Explore body measurements, nutrition, and fitness estimates with clear formulas, limitations, and source context.
Health-tool scopeThese tools are educational estimates, not diagnosis or treatment. Clinical and toxicity tools awaiting named credentialed review remain available in-site but are not submitted for search indexing.
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⚖️BMICalculate your Body Mass Index (BMI)🍎TDEE Calculator (Total Daily Energy Expenditure)Your TDEE is the total calories you burn in a day⚖️Body FatEstimate your body fat percentage using the U.S🥩Protein IntakeHow much protein do you actually need?⚖️Waist-to-Height RatioThe waist-to-height ratio is a simple, strong health screen: keep your waist under half your…
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Grouped by closely related intent, not one undifferentiated sitewide list.
Body, nutrition, fitness, and family health.
Body Metrics36
⚖️BMICalculate your Body Mass Index (BMI)🍎BMR & TDEEFind the calories your body burns🍺Blood Alcohol Content (BAC)Estimate blood alcohol content from your drinks, weight and time⚖️Body FatEstimate your body fat percentage using the U.S🚭Cost of SmokingSee the real price of the habit⚖️Ideal WeightWhat’s a healthy weight for your height?⚖️Lean Body MassEstimate your lean body mass (everything except fat) and fat mass from your height and weight,…😴SleepWake up refreshed by aligning with your sleep cycles⚖️Waist-to-Height RatioThe waist-to-height ratio is a simple, strong health screen: keep your waist under half your…⚖️Waist-to-Hip RatioYour waist-to-hip ratio is a quick marker of fat distribution and cardiometabolic risk🗓️PeriodNext 6 periods & cycle calendar🎖️Army Body Fat2023 one-site tape test, AR 600-9🎯Healthy WeightHealthy range + 4 ideal-weight formulas📐Body TypeBody shape from measurements🧍Body Surface AreaFive BSA formulas side by side📏Child Height PredictorHow tall will your child be👟RMRResting metabolic rate via Mifflin-St Jeor☀️Sunscreen CalculatorUV-index burn time by skin type, with SPF and risk band🧮Harris Benedict CalculatorBMR via the revised 1984 Harris-Benedict equations, plus TDEE🙂Face Shape CalculatorFace shape from forehead, cheek, jaw, and length⚓Navy Body Fat CalculatorBody fat % from tape measurements — official Navy equations📅Prescription Refill CalculatorDays supply, run-out date, and refill-by reminder💇Hair Growth CalculatorMonths to reach a target hair length at average rates📉Weight Loss Percentage CalculatorPercent of body weight lost, with milestones and health context👵Senior BMI CalculatorBMI with 65+ interpretation — the 23-30 senior zone explained⚖️Adjusted Body Weight CalculatorAjBW from Devine IBW plus 40% of the excess — lb and kg👩Womens BMI CalculatorBMI, category, and healthy weight range — women's context🧫UACR CalculatorUrine albumin-to-creatinine ratio in mg/g with KDIGO stage⚠️EtG CalculatorRough urine EtG detection-window estimate with strong caveats👓Contact Lens Vertex CalculatorSpectacle-to-contact power using vertex distance💊Medication Schedule CalculatorRound-the-clock dose times from a start time and interval🏋️FFMI CalculatorFat-free mass index with height normalization and bands🩸Transferrin Saturation CalculatorTransferrin saturation percent from serum iron and TIBC⚡Katch Mcardle CalculatorBMR from lean body mass: 370 + 21.6 × LBM, plus TDEE🌸Progesterone-to-Estrogen Ratio CalculatorProgesterone-to-estradiol mass ratio with honest caveats❤️Average Height for Men: 5'9" — CDC Percentiles by Age — NumberBenchThe average American man is 68.9 inches (5'9", 175.1 cm) per CDC NHANES 2021–2023. Percentile chart, height by age, and where you rank.
Nutrition & Diet28
🍎Calorie (TDEE)Estimate the calories your body uses each day🍎Calories BurnedHow many calories did that workout burn?🥗MacroTurn a calorie goal into a plate🥩Protein IntakeHow much protein do you actually need?🍎TDEE Calculator (Total Daily Energy Expenditure)Your TDEE is the total calories you burn in a day💧Water IntakeGet a rough daily water target based on your weight and how much you exercise🍞CarbohydrateDaily carbs from your TDEE🥑Fat IntakeDaily fat grams & saturated cap👟Steps to CaloriesCalories your daily step count burns👟Walking CalorieCalories burned walking, by pace and weight👟Swimming CalorieCalories burned swimming, by stroke and effort🔻Calorie Deficit CalculatorDaily calorie target for steady weight loss, from Mifflin-St Jeor⚖️Maintenance Calorie CalculatorCalories that hold your weight steady — Mifflin-St Jeor × activity🚴Biking Calorie CalculatorCalories burned cycling, by speed and weight — Compendium METs🏃Running Calorie CalculatorCalories burned running, by pace — per run, per mile, per hour🏋️Weight Lifting Calorie CalculatorCalories burned lifting weights — honest MET-based estimate🧍Standing Calorie CalculatorStanding vs sitting calories, hour by hour — honest numbers🤸Jump Rope Calorie CalculatorCalories burned jumping rope, by pace — Compendium METs🥾Hiking Calorie CalculatorCalories burned hiking — terrain and pack-load aware METs🧖Sauna Calorie CalculatorHonest sauna calorie estimate — and why the scale drop is water💓Calories Burned By Heart Rate CalculatorWorkout calories from average heart rate — Keytel equations🥦Net Carbs CalculatorNet carbs from a US label — fiber and sugar-alcohol aware🌾Fiber CalculatorDaily fiber target by age, sex, and calories (IOM)🤸Burpee Calorie CalculatorCalories per burpee and per set, from weight and pace (8 MET)🏃Elliptical Calorie CalculatorElliptical session calories from weight, minutes, and effort🪜Stairs Calorie CalculatorCalories burned climbing stairs, by weight, time, and pace🍼Breastfeeding Calorie CalculatorDaily calories while nursing — maintenance + IOM allowance🍽️EER CalculatorEstimated Energy Requirement, IOM 2005 adult equations
Fitness & Activity10
❤️Heart Rate ZoneTrain smarter with heart-rate zones🏋️One-Rep MaxEstimate your one-rep max from a recent set — no max-out attempt needed — plus…🏃Running PaceFind your pace from a distance and a finish time🏃VO2 MaxEstimate your VO2 max — the top marker of cardio fitness — from your resting heart…❤️Target Heart RateTraining zones by age (AHA)👟Steps to MilesSteps to miles from your height and stride🔥Fat Burning Zone CalculatorFat-burning heart-rate zone by age — simple or Karvonen💓Karvonen Formula CalculatorTarget heart rate from heart rate reserve (Karvonen method)👟Steps to Km CalculatorStep count to km and miles via height-based stride estimate⏱️Training Pace CalculatorEasy, tempo, and interval paces from one race (Riegel 1.06)
Clinical & Medical15
🌫️Wildfire SmokeTurn today's AQI into a cigarette equivalent🏥HDHP vs PPOWhich health plan costs less for you?🩺GFRCKD-EPI 2021 kidney function & stage🩸Blood Type CalculatorPossible child blood types from both parents' ABO and Rh🫀Mean Arterial Pressure CalculatorMean arterial pressure and pulse pressure from a BP reading📏Dosage CalculatorWeight-based mg/kg dose and volume — nursing math practice🩸Cholesterol Ratio CalculatorTotal-to-HDL and TG-to-HDL ratios plus non-HDL from a lipid panel⏳Drug Half Life CalculatorAmount and percent of a drug left after N half-lives💧Drops per Minute CalculatorIV gravity drip rate in gtt/min from volume, time, and drop factor🩺BUN Creatinine Ratio CalculatorBUN/Cr ratio from BUN and creatinine, with interpretation🫀LDL CalculatorFriedewald LDL and non-HDL cholesterol from a lipid panel🦵ABI CalculatorAnkle-brachial index per leg with PAD interpretation bands🫁AST ALT Ratio CalculatorAST-to-ALT (De Ritis) ratio with liver-pattern bands🧅Dog Onion Toxicity CalculatorOnion dose per body weight and risk band for dogs🍫Cat Chocolate Toxicity CalculatorTheobromine dose per kg and risk band for a cat that ate chocolate
Pregnancy, Family & Pets13
🤰PregnancyDue date, weeks & milestones⚖️Pregnancy Weight GainIOM recommended gain by week📅Pregnancy ConceptionWhen conception likely happened🌸OvulationFertile window & next 6 cycles👶ConceptionBest days to conceive — or reverse lookup📅Cat AgeHow old is your cat in human years?📅Dog AgeConvert your dog's age into human years🐶Puppy WeightPredict a puppy's adult weight from age & size🐶Dog PregnancyDue date from mating: the 63-day gestation🐈How Big Will My Cat Get?Project a kitten's adult weight from its current age and weight🦜Bird Age CalculatorBird years to human years, scaled by species lifespan🐹Hamster Age CalculatorHamster age to human years by species lifespan❤️Average Cat Weight: 8–12 lb Healthy Range by Breed — NumberBenchThe average healthy cat weighs about 10 pounds (8–12 lb range), but breed and frame matter more than the scale. Vet-sourced ranges and obesity benchmarks.
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