Health calculators
250 free tools. Search by what you want to do, or browse by category.
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BMI Calculator
Body mass index from height and weight, with your healthy weight range.
Body Fat Calculator (US Navy)
Estimate body fat percentage from tape measurements.
Ideal Weight Calculator
Compare ideal weight from four classic formulas.
Lean Body Mass Calculator
Split your weight into lean mass and fat mass.
Waist-to-Hip Ratio Calculator
Check where your body stores fat and the related health risk.
Waist-to-Height Ratio Calculator
A simple rule: keep your waist under half your height.
Body Surface Area Calculator
BSA by Mosteller, DuBois and Haycock formulas.
Body Roundness Index Calculator
A shape-based index of visceral fat from waist and height.
BMI Prime & Ponderal Index
How far your BMI sits from the upper healthy limit of 25.
Body Frame Size Calculator
Small, medium or large frame from height and wrist size.
Weight Change Percentage Calculator
Measure how much your weight has changed, in kg and as a percentage.
Healthy Weight Range Calculator
The weight range that gives a BMI of 18.5 to 24.9 for your height.
Adjusted Body Weight Calculator
A dosing and nutrition weight for people who are well above ideal weight.
Total Body Water Calculator
Estimate your body water using the Watson formula.
Body Fat from BMI Calculator
Estimate body fat percentage from BMI, age and sex (Deurenberg).
Fat-Free Mass Index Calculator
Lean mass relative to height, normalised for comparison.
Relative Fat Mass Calculator
A body fat estimate using only height and waist.
A Body Shape Index (ABSI) Calculator
Waist risk adjusted for height and weight.
Waist Circumference Risk Calculator
Check waist size against sex-specific risk thresholds.
Estimated Height from Knee Height
Estimate stature from knee height (Chumlea), useful when standing height is not possible.
Arm Muscle Area Calculator
Estimate muscle area in the upper arm from circumference and triceps skinfold.
Skeletal Muscle Index Calculator
Appendicular muscle mass scaled to height squared.
Conicity Index Calculator
Body shape and central fat distribution from waist, weight and height.
Body Adiposity Index Calculator
Estimate body fat percentage from hip circumference and height.
Hume Lean Body Mass Calculator
Lean mass estimate using the Hume equations for drug dosing and nutrition.
BMR Calculator
Calories your body burns at complete rest.
TDEE & Daily Calorie Calculator
Total daily energy expenditure at each activity level.
Weight Loss Timeline Calculator
How long to reach a goal weight at your calorie intake.
Macro Calculator
Protein, carb and fat grams for your calorie target.
Protein Intake Calculator
Daily protein range for your weight and goal.
Fiber Intake Calculator
Your daily fiber goal and how your intake compares.
Sodium Intake Calculator
Add up sodium across meals and compare with limits.
Added Sugar Limit Calculator
Compare your sugar intake with WHO and AHA limits.
Meal Calorie Planner
Divide daily calories across your meals and snacks.
Weight Gain Calculator
Calories and timeline to gain weight steadily.
Calorie Deficit for Weight Goal Calculator
Daily calorie deficit needed to reach a target weight by a chosen date.
Daily Carbohydrate Target Calculator
Grams of carbohydrate per day from your calorie goal and carb share.
Daily Fat Target Calculator
Grams of dietary fat per day from calories and a fat percentage.
Net Carbs Calculator
Subtract fibre and sugar alcohols from total carbohydrate.
Macronutrient Calorie Split Calculator
Turn grams of protein, carbs and fat into calories and percentages.
Recipe Calories per Serving Calculator
Divide a recipe’s total calories by its number of servings.
Food Calories by Weight Calculator
Calories in a portion from calories per 100 g and the grams you eat.
Sugar in Teaspoons Calculator
Convert grams of sugar into teaspoons and compare with a daily limit.
Daily Calcium Needs Calculator
Recommended daily calcium based on age and sex.
Daily Iron Needs Calculator
Recommended daily iron intake for adults by sex and age.
Daily Vitamin D Needs Calculator
Recommended vitamin D intake by age, with the adult upper limit.
Daily Potassium Needs Calculator
Adequate daily potassium intake for adults by sex.
Protein per Meal Calculator
Split your daily protein target across the meals you eat.
Hand Portion Size Estimator
Estimate daily portions of protein, carbs, vegetables and fats using your hand.
Fruit and Vegetable Servings Tracker
See how close you are to a 5-a-day fruit and vegetable target.
Target Heart Rate Calculator
Heart rate training zones using the Karvonen method.
Max Heart Rate Calculator
Maximum heart rate from several published formulas.
VO2 Max Calculator
Estimate aerobic fitness from the Cooper 12-minute run.
One-Rep Max Calculator
Estimate your max lift from a lighter set.
Calories Burned Running Calculator
Calories burned for a run of any distance.
Steps to Calories Calculator
Convert your daily steps to distance and calories.
Running Pace & Race Predictor
Pace per km and mile plus predicted race times.
Cycling Calories Calculator
Calories burned cycling by speed and time.
Calories Burned by Activity
Compare calories burned across ten activities.
Heart Rate Recovery Calculator
How quickly your pulse drops one minute after exercise.
Training Volume Calculator
Total weight lifted in a workout: sets × reps × load.
Weekly Activity Goal Calculator
Check your weekly minutes against the 150-minute moderate activity guideline.
Walking Time for Distance Calculator
How long a walk takes at your speed.
Steps for Distance Calculator
Estimate how many steps a distance takes from your height.
Interval Training Time Calculator
Total time for work and rest intervals.
Swim Pace Calculator
Your pace per 100 metres from distance and total time.
Race Time Equivalent Calculator
Predict a finish time at a new distance from a recent race (Riegel formula).
Speed and Pace Converter
Convert km/h into mph and minutes per kilometre.
Progressive Overload Plan Calculator
Plan how your working weight rises week by week.
Time Under Tension Calculator
Total seconds your muscles work during a set, based on tempo.
Pool Laps Calculator
Number of lengths needed to swim a set distance.
Warm-Up Sets Calculator
Warm-up weights as a percentage of your working weight.
Sweat Rate Calculator
Estimate how much you sweat per hour to plan fluid intake.
Rockport One-Mile Walk Fitness Test
Estimate VO2 max from a one-mile walk time and heart rate.
Strength-to-Bodyweight Ratio Calculator
Compare a lift with your body weight.
Blood Pressure Category Calculator
See which ACC/AHA blood pressure category you fall in.
Mean Arterial Pressure Calculator
Average pressure that perfuses your organs.
Pulse Pressure Calculator
The gap between your top and bottom blood pressure numbers.
Cholesterol Ratio Calculator
Total-to-HDL ratio as a heart risk indicator.
LDL Cholesterol Calculator
Estimate LDL from a standard lipid panel (Friedewald).
Non-HDL Cholesterol Calculator
All the cholesterol carried by harmful particles.
Triglyceride-to-HDL Ratio Calculator
A quick marker of insulin resistance and heart risk.
Corrected QT (QTc) Calculator
Correct the ECG QT interval for heart rate.
Cardiac Output Calculator
Blood pumped per minute and cardiac index.
Rate Pressure Product Calculator
Heart workload from pulse and systolic pressure.
Resting Heart Rate Category Calculator
Check your resting pulse against common adult ranges.
Blood Pressure Average Calculator
Average several home readings for a more reliable blood pressure picture.
Orthostatic Hypotension Check
Measure the blood pressure drop when you stand up.
Ankle-Brachial Index Calculator
Compare ankle and arm blood pressure to screen for leg artery disease.
hs-CRP Heart Risk Calculator
Classify high-sensitivity C-reactive protein as a cardiovascular risk marker.
Lipoprotein(a) Unit Converter
Convert Lp(a) between nmol/L and mg/dL.
HDL to LDL Ratio Calculator
Compare protective HDL with LDL cholesterol.
Triglyceride-Glucose (TyG) Index Calculator
Estimate insulin resistance from fasting triglycerides and glucose.
RR Interval to Heart Rate Calculator
Convert the time between heartbeats on an ECG into beats per minute.
Ejection Fraction Calculator
Percentage of blood the left ventricle pumps each beat.
LDL Reduction Percentage Calculator
Measure how much your LDL cholesterol has dropped.
Pulse Count Heart Rate Calculator
Work out heart rate from beats counted in 15 seconds.
AFib Stroke Risk (CHA₂DS₂-VASc) Calculator
Score stroke risk for people with atrial fibrillation.
Blood Pressure Variability Calculator
Measure how much your systolic readings vary from one to the next.
Cholesterol Unit Converter
Convert total cholesterol between mg/dL and mmol/L.
A1C to Average Glucose Calculator
Convert HbA1c to estimated average glucose.
Average Glucose to A1C Calculator
Estimate HbA1c from average glucose readings.
Blood Glucose Converter & Checker
Convert mg/dL and mmol/L and check fasting levels.
HOMA-IR Calculator
Insulin resistance estimated from fasting glucose and insulin.
QUICKI Insulin Sensitivity Calculator
Insulin sensitivity index from fasting labs.
Insulin-to-Carb Ratio Calculator
Educational estimate of meal and correction insulin.
Total Daily Insulin Estimator
Typical basal and bolus split, for education.
Glycemic Load Calculator
How much a food portion raises blood sugar.
Type 2 Diabetes Risk Score
ADA-style risk points from lifestyle and history.
Time in Range & GMI Calculator
CGM time in range and glucose management indicator.
Fasting Glucose Category Calculator
Classify a fasting blood glucose result using ADA thresholds.
Two-Hour Glucose Tolerance Category
Classify a 2-hour oral glucose tolerance test result.
Glucose Variability Calculator
Coefficient of variation from several glucose readings.
Insulin Correction Dose Calculator
Estimate a correction dose from current glucose, target and correction factor.
Low Blood Sugar Treatment Calculator
Check whether a reading is low and how much fast-acting sugar to take (rule of 15).
HOMA-B Beta-Cell Function Calculator
Estimate pancreatic beta-cell function from fasting glucose and insulin.
Urine Albumin-to-Creatinine Ratio Calculator
Classify kidney damage risk from urine albumin and creatinine.
Insulin Pen Days Supply Calculator
Days left in your insulin pen or vial at your daily dose.
Glucose Test Strip Supply Calculator
How many test strips you need per month and how long a box lasts.
A1C Unit Converter (% and mmol/mol)
Convert HbA1c between percentage and IFCC mmol/mol units.
Carbohydrate Budget per Meal Calculator
Split your daily carbohydrate allowance across meals and snacks.
Plate Method Portion Calculator
Split a meal into vegetables, protein and starch using the plate method.
Glucose Meter Accuracy Check
Compare a meter reading against a lab value using the ISO 15197 accuracy limits.
1800 Rule Correction Factor Calculator
Estimate how far 1 unit of rapid insulin lowers glucose from your total daily dose.
Average of Glucose Readings Calculator
Average several glucose readings to see the overall trend.
Pregnancy Due Date Calculator
Estimated due date from your last period.
Conception Date Calculator
Work backwards from a due date to when you conceived.
Ovulation & Fertile Window Calculator
Predict ovulation day and your most fertile days.
Gestational Age Calculator
Weeks and days pregnant on any date.
Pregnancy Weight Gain Calculator
Recommended weight gain by week using IOM guidance.
Pregnancy Calorie Calculator
Extra daily calories needed by trimester.
Menstrual Cycle Length Calculator
Average cycle length, regularity and next period.
IVF Due Date Calculator
Due date from your embryo transfer date.
Breastfeeding Calorie Calculator
Calories and fluids needed while nursing.
Osteoporosis Self-Assessment (OST)
Simple bone density screening score for women.
Pregnancy Trimester Calculator
Find your current trimester and weeks pregnant from your last period date.
Estimated Fetal Weight (Hadlock) Calculator
Estimate baby’s weight from ultrasound measurements (Hadlock 3 formula).
Baby Kick Count Calculator
Work out your kicks per hour and whether it meets the 10-kicks-in-2-hours guideline.
Next Period Predictor
Predict your next period start date from your last period and cycle length.
Cycle Day Calculator
Find which day of your cycle today is, counting the first day of bleeding as day 1.
Days Until Due Date Calculator
Count the days left until your estimated due date from your last period.
Daily Folate Needs Calculator
Recommended daily folate (folic acid) for pregnancy, breastfeeding or not pregnant.
Cervical Screening Interval Calculator
Typical cervical screening interval by age (US guidance).
Mammogram Screening Schedule Calculator
Typical breast screening frequency by age.
Average Cycle Length Calculator
Average your last few cycle lengths to predict the next one.
Pregnancy Test Timing Calculator
Find the earliest day a pregnancy test is likely to be reliable.
Gestational Diabetes Screening Date Calculator
Find when the usual 24–28 week glucose test falls.
Prenatal Visit Schedule Calculator
Typical prenatal visit frequency for your current week.
Breast Milk Storage Time Calculator
How long expressed breast milk stays safe in different conditions.
Pregnancy and Breastfeeding Water Target
Total daily water intake recommended in pregnancy and while breastfeeding.
Child Adult Height Predictor
Mid-parental height estimate for your child.
Children’s Acetaminophen Dose Calculator
Weight-based paracetamol dose for fever or pain.
Children’s Ibuprofen Dose Calculator
Weight-based ibuprofen dose for children over 6 months.
Baby Formula Feeding Calculator
How much milk your baby needs each day.
Pediatric Maintenance Fluids Calculator
Daily fluid needs by weight (Holliday-Segar).
Child Calorie Needs Calculator
Daily energy needs for ages 3–18.
Child Sleep Needs Calculator
Recommended sleep for your child’s age.
Kids Screen Time Calculator
Compare weekly screen time with age guidelines.
Baby Corrected Age Calculator
Adjusted age for babies born early.
Kids Water Intake Calculator
Daily fluid needs for children and teens.
Newborn Weight Change Calculator
Check how much a newborn has lost or regained since birth.
Infant Weight Gain Rate Calculator
Weekly weight gain between two weigh-ins for a baby.
Apgar Score Calculator
Score a newborn’s condition at 1 and 5 minutes after birth.
Child Iron Needs Calculator
Recommended daily iron for children and teens by age and sex.
Child Calcium Needs Calculator
Recommended daily calcium for infants, children and teens.
Child Vitamin D Needs Calculator
Recommended daily vitamin D for infants and children.
Child Caffeine Limit Calculator
Compare a child’s caffeine intake with a commonly cited limit of 2.5 mg per kg per day.
Toddler Milk Intake Checker
Check daily cow’s milk against the 480 ml (16 oz) guideline for toddlers.
Child Growth Velocity Calculator
Height gained per year between two measurements.
Mid-Parental Height Calculator
Predict a child’s adult height from both parents’ heights.
Child Resting Heart Rate Calculator
Compare a child’s resting heart rate with typical ranges for their age.
Infant Feeds per Day Guide
Typical number of feeds in 24 hours for a baby’s age.
Child Protein Needs Calculator
Recommended daily protein for children and teens.
Child Zinc Needs Calculator
Recommended daily zinc for children and teens by age and sex.
Kids Daily Activity Check
Compare a child’s daily active minutes with the 60-minute guideline for ages 6–17.
Bedtime Calculator
Best bedtimes to wake up between 90-minute sleep cycles.
Wake-Up Time Calculator
When to set your alarm if you go to bed now.
Sleep Debt Calculator
Total sleep shortfall over the last seven nights.
Caffeine Cutoff Calculator
Last time to drink coffee without hurting sleep.
Stress Level Check
An informal 8-question check of recent stress.
PHQ-9 Depression Screening
The standard nine-question depression screening tool.
GAD-7 Anxiety Screening
The standard seven-question anxiety screening tool.
Burnout Check
An informal six-question check for work burnout.
Chronotype Calculator
Are you a morning lark or night owl? Uses mid-sleep time.
Nap Planner
Best time and length for a nap that will not wreck tonight’s sleep.
Insomnia Severity Index (ISI) Calculator
Score the seven ISI questions to gauge how severe your insomnia is.
Epworth Sleepiness Scale
Measure daytime sleepiness across eight everyday situations.
Sleep Efficiency Calculator
Share of your time in bed that you actually spent asleep.
Social Jetlag Calculator
Measure how far your weekend sleep midpoint shifts from your weekday schedule.
Screen-Free Bedtime Calculator
Find the time to put screens away before bed.
Sleep Duration by Age Check
Compare nightly sleep with recommended ranges for your age.
UCLA Loneliness Scale (3-item)
A quick three-question loneliness screen.
Perceived Stress Scale (PSS-4)
A four-item measure of how stressed you have felt recently.
WHO-5 Wellbeing Index
A five-question index of recent emotional wellbeing (0–100).
Sleep Latency Calculator
Check how long it takes you to fall asleep.
Sleep Hygiene Score
Score six everyday habits that support good sleep.
STOP-BANG Sleep Apnoea Screening
Screen for obstructive sleep apnoea with the eight-question STOP-BANG tool.
Kessler K6 Distress Scale
Six questions about recent emotional distress.
Brief Resilience Score (BRS)
Measure your ability to bounce back from stress (six items, 1–5 each).
Last Meal Before Bed Timing Calculator
Check the gap between your last meal and bedtime.
Water Intake Calculator
Daily water needs for your weight, exercise and climate.
Alcohol Units & Calories Calculator
Weekly alcohol units and calories from your drinks.
Blood Alcohol Content Estimator
Rough BAC estimate and time to sober, using Widmark.
Daily Caffeine Intake Calculator
Add up caffeine from coffee, tea, soda and energy drinks.
Smoking Cost & Savings Calculator
What smoking costs and what you save by quitting.
Sun Exposure & SPF Calculator
Estimated time to burn with and without sunscreen.
Daily Step Goal Planner
Build up your steps gradually toward a goal.
Sitting Time Calculator
How much of your waking day you spend sitting.
Alcohol-Free Savings Calculator
Money, calories and units avoided since you stopped.
Habit Formation Calculator
How far along you are toward making a habit automatic.
Quit Smoking Timeline Calculator
See how many days you have been smoke-free and the next health milestone.
Caffeine per Drink Calculator
Estimate the caffeine in your drinks and compare with a 400 mg daily guideline.
Weekly Screen Time Calculator
Turn your daily screen hours into weekly and yearly totals.
Active Commute Minutes Calculator
Weekly minutes of walking or cycling to work or school.
Urine Colour Hydration Check
Use the 1–8 urine colour chart to judge hydration.
Sunscreen Quantity Calculator
How much sunscreen to pack for a day outdoors.
Noise Exposure Safe Time Calculator
How long you can listen safely at a given loudness (NIOSH 85 dBA, 3 dB rule).
Heat Index Calculator
Feels-like temperature from air temperature and humidity (°F).
Water Bottle Refill Calculator
How many times you need to refill your bottle to meet your daily water target.
Coffee Spending Calculator
Yearly cost of your daily coffee habit.
Movement Break Planner
Plan how often to stand up during a day of sitting.
Cooking Oil Calories Calculator
Calories added to a dish by tablespoons of oil.
Gym Cost per Visit Calculator
Work out what each gym visit really costs.
Sugary Drink Calories Calculator
Calories and body-fat equivalent from regular sugary drinks.
Yearly Commute Time Calculator
Total hours you spend commuting each year.
eGFR Kidney Function Calculator
Kidney filtration rate using CKD-EPI 2021.
Creatinine Clearance Calculator
Cockcroft-Gault estimate used for drug dosing.
Anion Gap Calculator
Serum anion gap, corrected for albumin.
Corrected Calcium Calculator
Calcium adjusted for low albumin.
Corrected Sodium Calculator
Sodium adjusted for high blood glucose.
BUN-to-Creatinine Ratio Calculator
Helps tell dehydration from kidney problems.
Serum Osmolality Calculator
Blood concentration from sodium, glucose and BUN.
Body Temperature & Fever Checker
Convert °C and °F and see if it counts as a fever.
Age Calculator
Exact age in years, months and days, plus next birthday.
Pack-Years Calculator
Smoking history and lung cancer screening eligibility.
Free Water Deficit Calculator
Estimate the water deficit in high sodium (hypernatraemia) using body water fraction.
Fractional Excretion of Sodium (FENa) Calculator
Estimate how the kidneys handle sodium from urine and serum values.
Osmolal Gap Calculator
Difference between measured and calculated serum osmolality.
Delta Ratio (Delta-Delta) Calculator
Compare the anion gap rise with the bicarbonate fall in metabolic acidosis.
Winter’s Formula Calculator
Expected CO₂ compensation for metabolic acidosis.
MELD Score Calculator
Liver disease severity score from bilirubin, INR and creatinine (original MELD).
MCV and MCH Calculator
Red cell size and haemoglobin content from a full blood count.
Corrected Reticulocyte Count Calculator
Adjust the reticulocyte percentage for the degree of anaemia.
Transferrin Saturation Calculator
Iron saturation of transferrin from serum iron and TIBC.
Albumin-to-Globulin Ratio Calculator
Ratio of albumin to globulin from total protein and albumin.
Albumin-Corrected Anion Gap Calculator
Anion gap adjusted for low albumin.
De Ritis Ratio (AST/ALT) Calculator
Compare AST and ALT liver enzymes.
Neutrophil-to-Lymphocyte Ratio (NLR) Calculator
Ratio of neutrophils to lymphocytes from a blood count.
Creatinine Unit Converter
Convert serum creatinine between µmol/L and mg/dL.
Haemoglobin to Hematocrit Estimate
Estimate hematocrit from haemoglobin using the rule of three.
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