Calculatrices santé et fitness gratuites

Plus de 200 outils en ligne qui fonctionnent directement dans votre navigateur : sans inscription, sans publicité et sans envoyer vos données. Chaque calculatrice affiche sa formule, un exemple concret et une foire aux questions.

Composition corporelle

BMI Calculator

Use the free BMI calculator to check your Body Mass Index in seconds. Metric or imperial, instant category result, private and mobile-friendly, with the formula and 36 FAQs.

Body Fat Calculator

Estimate your body fat percentage free with the US Navy circumference method. Metric or imperial, instant result with healthy ranges and 36 FAQs. Private, no sign-up.

Ideal Weight Calculator

Estimate a healthy target weight for your height with this free ideal weight calculator. Uses BMI and target range, metric or imperial, with clear guidance and FAQs.

Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio free. A simple health-risk indicator based on waist and hip measurements, with WHO ranges and guidance. Instant and private.

Waist-to-Height Ratio Calculator

Calculate your waist-to-height ratio free. A simple 'keep your waist below half your height' health check with risk categories. Instant and private.

Female Body Type Calculator

Estimate your body shape (apple, pear, hourglass, rectangle) from bust, waist and hip measurements with this free female body type calculator. Private and instant.

Lean Body Mass Calculator

Calculate lean body mass (LBM) free with the Boer formula. Estimate fat-free mass, fat mass and body fat from height and weight. Instant and private.

Body Adiposity Index Calculator

Estimate body fat percentage from hip circumference and height using the Body Adiposity Index. Free BAI calculator, no scale needed. Instant and private.

Weight Loss Goal Calculator

Plan healthy weight loss with this free goal calculator. Estimate a realistic target date and daily calorie target based on your current and goal weight. Instant and private.

Frame Size Calculator

Estimate small, medium or large body frame from wrist circumference and height. A quick, free bone-structure guide for interpreting healthy weight.

Body Shape Index (ABSI)

Calculate A Body Shape Index from height, weight and waist. A free ABSI calculator combining BMI and waist for health risk context.

Waist Circumference

Check whether your waist falls in a healthy range using sex-specific action levels for cardiometabolic risk.

Relative Fat Mass (RFM)

Estimate body fat percentage from height and waist using the RFM formula. A simple tape-measure method.

Body Roundness Index

Calculate BRI from height and waist as an alternative body-shape and health-risk measure.

Ponderal Index

Calculate the Ponderal Index (kg/m³), a height-cubed leanness ratio related to BMI.

BMI Prime

See your BMI as a ratio of the healthy upper limit for an instant relative reading. Free and simple.

Body Fat Category

See what a body fat percentage means with men's and women's athletic, fitness and average ranges.

Amputee Weight & BMI

Estimate whole-body weight and an adjusted BMI after amputation using segment percentages.

Fracture Risk

A simplified 10-year fracture-risk estimate from age, BMI, family history and smoking. Not FRAX®.

BMI for Older Adults

Calculate BMI with context for adults 65+, including the older-adult healthy range.

Healthy Weight Range

Find a healthy weight range for your height using BMI 18.5–24.9.

Body Fat from BMI

Estimate body fat percentage from BMI, age and sex using the Deurenberg formula.

BMI Percentile

Get an approximate adult BMI percentile and the standard weight category.

Body Recomposition

Estimate lean mass, protein and a mild deficit for building muscle while losing fat.

Ideal Body Weight (Devine)

Estimate ideal body weight by height using the clinical Devine formula.

Adjusted Body Weight

Estimate adjusted body weight (IBW + 40% of excess) used in clinical contexts.

Goal Weight by Body Fat

Estimate goal weight at a desired body-fat percentage assuming lean mass is preserved.

Katch-McArdle BMR

Calculate BMR from lean body mass using the Katch-McArdle formula.

FFMI (Fat-Free Mass Index)

Calculate Fat-Free Mass Index from weight, body fat and height as a muscularity estimate.

Protein by Goal Weight

Set a daily protein target from goal weight and whether you build or cut.

Calories et nutrition

BMR Calculator

Free BMR calculator using the Mifflin-St Jeor equation. Estimate your basal metabolic rate and daily calories burned at rest, in metric or imperial, instantly and privately.

BMR Calculator (Lean Body Mass)

Estimate BMR from lean body mass with the Katch-McArdle formula. Free lean-mass BMR calculator for more accurate resting calories when body fat is known. Private and instant.

BMR Calculator for Children

Estimate a child's basal metabolic rate with a paediatric, age-appropriate formula. Free BMR calculator for children and teens, with guidance and limits. Instant and private.

TDEE Calculator

Calculate your TDEE free. Estimate total daily energy expenditure from BMR and activity level to plan maintenance, fat loss or muscle gain. Instant and private.

Maintenance Calories Calculator

Find your maintenance calories with this free calculator. Estimate the daily intake that keeps your weight steady, based on BMR and activity. Instant, private, metric/imperial.

Calorie Needs Calculator

Free calorie needs calculator estimates how many calories you should eat per day to lose, maintain or gain weight, based on BMR and activity. Instant, private and metric/imperial.

Protein Needs Calculator

Estimate your daily protein needs free based on body weight, goal and activity. Grams per day for muscle gain, fat loss or maintenance. Instant and private.

Water Intake Calculator

Estimate your daily water intake in litres and glasses based on weight and activity. Free hydration calculator with practical guidance. Instant and private.

36-Hour Fast Calculator

Plan a 36-hour fast with this free calculator. Get start/end times, fasting windows and safety guidance. Instant and private, with evidence-based notes.

Macro Calculator

Split daily calories into protein, carbs and fat for cutting, maintenance, bulking or keto. Free macronutrient planner in grams.

Sodium Intake Calculator

Compare daily sodium against recommended limits and convert sodium to grams of salt. Free sodium tracker for blood-pressure health.

Fiber Intake Calculator

Estimate your daily fibre target in grams from calorie intake using the 14 g per 1000 kcal guideline. Free and instant.

Child Calorie Calculator

Estimate daily energy needs for children 3–18 from age, size and activity using IOM-style equations.

Sleep Calories

Estimate calories burned while sleeping from body weight and hours using a 0.95 MET factor.

Calcium Intake

See daily calcium targets by life stage with food-source and vitamin D notes.

Weight Loss Date

Calculate the daily calorie target to reach a goal weight by your chosen date.

Carb Intake

Set a daily carbohydrate target in grams from calories and a preferred carb percentage.

Resting Calories

Estimate calories burned at rest (BMR) with the Mifflin-St Jeor equation.

Active Calories

Estimate TDEE and daily activity calories from BMR and an activity factor.

Daily Value (%)

Calculate the % Daily Value of a nutrient for a serving using label reference values.

Pregnancy Calories

Estimate extra calories in the second and third trimesters.

Breastfeeding Calories

Estimate extra calories used making breastmilk from milk volume.

Harris-Benedict BMR

Calculate basal energy expenditure with the Harris-Benedict equation.

Potassium Intake

See an approximate daily potassium target by profile.

Magnesium Intake

Estimate a daily magnesium target from sex and age.

Vitamin C Intake

See a daily vitamin C target by life stage.

Vitamin B12 Intake

See daily B12 targets by life stage with food-source notes.

Formula Scoop

Estimate formula powder and scoops for a bottle from water and concentration.

Paediatric Fluid

Estimate a child's maintenance fluid using the Holliday-Segar method.

NEAT Calories

Estimate extra calories burned through non-exercise activity like steps.

Cœur et constantes

Blood Pressure Calculator

Check what your blood pressure reading means with this free calculator. Systolic and diastolic categories with pulse pressure. Educational only, not a diagnosis.

Heart Age Calculator

Estimate your heart age based on blood pressure, smoking, diabetes and BMI. A free, educational cardiovascular risk calculator. Not a diagnosis — see your doctor.

Heart Rate Reserve (HRR) Calculator

Calculate your heart rate reserve and target training zones with this free HRR calculator. Uses resting and maximum heart rate for accurate cardio zones. Instant and private.

eGFR Kidney Function Calculator

Estimate estimated glomerular filtration rate (eGFR) with the CKD-EPI formula. Free kidney function calculator from age, sex and creatinine. For education, not diagnosis.

Body Surface Area Calculator

Estimate body surface area (BSA) in m² with the Du Bois formula. Free BSA calculator used for medication dosing and health assessment. Instant and private.

Blood Alcohol Content Calculator

Estimate blood alcohol content (BAC %) with the Widmark formula. Free, private BAC calculator for educational use. Never drink and drive.

LDL Cholesterol Calculator

Estimate LDL ("bad" cholesterol) with the Friedewald formula from total, HDL and triglycerides. Free lipid panel helper.

Cardiovascular Risk Calculator

Estimate 10-year heart risk from age, blood pressure, cholesterol and smoking. Free educational heart-risk tool.

Maximum Heart Rate Calculator

Estimate max heart rate using 220 minus age, Tanaka, Gellish and Oakland formulas. Free MHR for training zones.

HbA1c Calculator

Convert HbA1c percentage to average blood glucose (eAG) in mg/dL and mmol/L using the ADA formula. Free and private.

Insulin-to-Carb Ratio Calculator

Estimate a starting insulin-to-carb ratio and correction factor using the 500 and 1800 rules. Educational only.

Heart Rate Zones

Calculate five training zones as percentages of your age-estimated max heart rate for cardio planning.

Oxygen Saturation (SpO2)

Interpret a pulse oximeter reading with normal, low and urgent ranges and safety guidance.

Respiratory Rate

Check a breathing rate against typical ranges for adults, children and infants. Educational only.

Gait Speed

Calculate walking speed in m/s and mph from distance and time as a simple mobility marker.

Fitness Age

Estimate a rough "fitness age" from age, resting heart rate and weekly activity.

Blood Type Compatibility

See which donor blood types a recipient can receive for red-cell transfusion. Educational guide.

Recovery Heart Rate

Check the one-minute heart-rate drop after exercise as a fitness-recovery marker.

Rh Factor Compatibility

Check possible Rh incompatibility between parents for pregnancy. Educational guide.

Uric Acid

Interpret a uric acid level for men and women with typical ranges and gout-risk context.

FIB-4 Liver Fibrosis

Estimate liver fibrosis risk from age, AST, ALT and platelets. Educational only.

Corrected QT (QTc)

Correct a QT interval for heart rate using Bazett's formula. ECG education only.

Creatinine Clearance

Estimate CrCl with the Cockcroft-Gault equation from age, weight and creatinine.

Mean Arterial Pressure

Calculate MAP from systolic and diastolic blood pressure.

Pulse Pressure

Calculate pulse pressure (systolic minus diastolic) and its general meaning.

Altitude Oxygen

Get a rough sea-level-equivalent SpO2 for a reading taken at altitude.

Bone Density T-Score

Interpret a DEXA T-score as normal, osteopenia or osteoporosis.

FEV1/FVC

Calculate the spirometry FEV1/FVC ratio and its general meaning.

Anemia (Hemoglobin)

Interpret a hemoglobin level for men, women and pregnancy.

Glasgow Coma Scale

Add eye, verbal and motor responses into a GCS score (educational).

Activité

Steps to Calories Calculator

Convert steps to calories with this free calculator. Estimate calories burned walking based on step count, height and sex. Instant, private, metric/imperial.

Steps to Miles Calculator

Convert steps to miles free with this calculator. Estimate walking or running distance from step count and height, with a reverse option. Instant and private.

Steps to Kilometers Calculator

Convert steps to kilometres free with this metric calculator. Estimate walking distance from step count and height, plus reverse km-to-steps. Instant and private.

Walking Calorie Calculator

Estimate calories burned walking with this free calculator. Enter weight, pace and duration to see calories burned for any walk. Instant, private and accurate.

StairMaster Calorie Calculator

Estimate calories burned on a StairMaster or stair climber with this free calculator. Enter weight, level and duration for an instant, private result.

Push-Up Calorie Calculator

Estimate calories burned doing push-ups with this free calculator. Enter your weight, reps or minutes and intensity for an instant, private result.

VO2 Max Calculator

Estimate your VO2 max from a 12-minute walk/run using the Cooper formula. Free cardio fitness calculator with age and sex ratings. Instant and private.

Sleep Calculator

Find the best bedtime or wake-up time with this free sleep calculator. Plan sleep in 90-minute cycles so you wake between cycles, feeling rested. Instant and private.

Calories Burned Calculator

Estimate calories burned for walking, running, cycling, swimming and more using MET values and your weight. Free and instant.

Running Pace Calculator

Calculate pace per km and per mile, plus speed in km/h, from any distance and time. Free run, walk or split tool.

Sweat Rate Calculator

Estimate your hourly sweat and fluid loss during exercise from before/after weight. Free hydration planner for athletes.

One-Rep Max Calculator

Estimate your 1RM with Epley, Brzycki and Lombardi formulas from a weight and reps. Free strength-planning tool.

Caffeine Half-Life Calculator

See how much caffeine remains in your body over time and when it clears. Free coffee/energy-drink timing tool.

Alcohol Units Calculator

Convert beer, wine and spirits into alcohol units, grams and calories. Free drink-tracking and health-awareness tool.

Rep Max Calculator

Find the weight to lift for a target number of reps from your one-rep max, using Epley percentages.

Resting Heart Rate

See what your resting pulse suggests about general fitness and recovery. Educational only.

Sleep Debt Calculator

Estimate weekly sleep deficit and how many recovery nights you need to repay it.

Ankle-Brachial Index

Calculate ABI from ankle and arm pressures as an educational PAD screening estimate.

Daily Steps

Categorise your step count and estimate the distance covered. A simple activity guide.

Running Speed

Convert a running pace (min/km) into speed in km/h and mph instantly.

Running Cadence

Estimate stride length and speed from height and steps per minute.

Steps to Calories

Convert steps to estimated distance and calories from height, weight and pace.

Rockport Walk

Estimate VO2 max from a one-mile walk time, heart rate, age and weight.

Cooper 12-Min Run

Estimate VO2 max from distance covered in a 12-minute run.

Training Paces

Estimate easy, tempo and interval paces from a recent race time.

Training Load (ACWR)

Compare this week's training load with the four-week average to spot spikes.

Stride Length

Estimate running stride length from height and cadence, plus speed.

Exercise Hydration

Estimate fluid and sodium to replace during exercise from sweat rate.

Elevation Calories

Estimate extra calories burned climbing elevation gain by weight.

Ovulation Test Timing

Estimate the best days to use ovulation tests around your cycle.

Santé féminine

Ovulation Calculator

Estimate your ovulation date and fertile window from your last period and cycle length. Free fertility calculator, not contraception.

Pregnancy Due Date Calculator

Estimate your baby's due date from the first day of your last period. Free due date and gestational-age tool.

Period Calculator

Predict your next period, fertile window and ovulation from your last cycle. Free menstrual tracker, educational only.

Pregnancy Test Date

Find the earliest and most reliable dates to take a home pregnancy test after ovulation. Free when-to-test guide.

Due Date by Conception

Estimate a due date as 266 days from conception or IVF, with trimester milestones. Free pregnancy calculator.

Baby Milk Intake

Estimate daily formula or breastmilk volume from a baby's weight and feeds per day. Educational guide only.

Conception Date

Estimate when conception likely occurred by counting back 266 days from a due date.

Pregnancy Trimester

Find which trimester a number of pregnancy weeks falls in and weeks remaining. Simple guide.

Blood Type Calculator

Predict possible child ABO blood types from the parents' types with a simple Punnett model. Educational only.

Apgar Score

Understand how the five Apgar signs combine into a newborn 0–10 score. Educational tool for parents.

Implantation Date

Estimate the 6–12 day implantation window after ovulation for early-pregnancy context.

hCG Doubling

Project expected hCG rise between beta tests using 48- and 72-hour doubling.

IVF Due Date

Estimate an IVF/FET due date from embryo transfer date and embryo age.

Pregnancy Weeks to Months

Convert pregnancy weeks to months and see the current trimester.

Postpartum Weight

See weight remaining above pre-pregnancy after birth with gentle context.

Baby Sleep

See recommended total sleep, including naps, by age from infants to teens.

Weeks Until Due

Count weeks and days to a due date with simple pregnancy context.

Kick Count

Record how long ten fetal movements take with simple guidance.

Fertility by Age

See an illustrative monthly conception chance by age for context.

Pregnancy Caffeine

Compare daily caffeine with the commonly cited 200 mg limit.

Cycle Variability

Calculate average cycle length and regularity from several cycles.

Baby Feeding Interval

See an approximate feeding interval by baby age.

Ultrasound Due Date

Estimate a due date from an ultrasound and gestational age.

Baby Age in Weeks

Calculate a baby's age in weeks and days from birth.

Pregnancy Gain Remaining

Estimate remaining pregnancy weight gain by BMI.

Clinique