Health & Fitness

Calculate your Body Mass Index (BMI) from height and weight, with the WHO weight category.

Estimate your body fat percentage with the US Navy circumference method using neck, waist, hip and height measurements in centimeters.

Calculate your daily calorie needs (TDEE) with the Mifflin-St Jeor equation and get target calories to lose, maintain, or gain weight.

Find out how many weeks and days pregnant you are from your last menstrual period (LMP), with trimester, estimated due date and days remaining.

Calculate your maximum heart rate and the five training zones in beats per minute from your age, for smarter cardio workouts.

Find your ideal body weight in kilograms from your height and sex using the widely used Devine formula, with a healthy reference range.

Estimate your one-rep max (1RM) from a set using the Epley formula, plus a percentage chart of training loads (95%–70%) with target rep ranges.

Estimate your ovulation day and fertile window from your last period and cycle length, plus your next expected period date. Free ovulation and fertility calculator.

Track your pregnancy week by week. Enter your last menstrual period to find your current gestational age, trimester, estimated due date and how far along you are.

Estimate your pregnancy due date with Naegele’s rule from your last menstrual period and cycle length. See gestational age, trimester and conception date.

Calculate your waist-to-hip ratio (WHR) and see your health risk category based on World Health Organization thresholds for men and women.

Estimate how much water you should drink each day based on your body weight and daily exercise, shown in litres, milliliters, and cups.

Estimate your Basal Metabolic Rate (BMR) and daily calorie needs using the Mifflin-St Jeor equation.

Calculate body surface area (BSA) in square meters from height and weight using the simple and accurate Mosteller formula.

Work out the daily calorie target you need to lose weight. Enter your maintenance calories (TDEE) and a weekly goal to get a safe daily intake and deficit.

Estimate calories burned during exercise using MET values from the Compendium of Physical Activities. Pick an activity, enter your weight and duration.

Estimate the date you conceived from your last menstrual period or your due date, with a likely fertile conception window of a few days.

Estimate your lean body mass (LBM) in kilograms from weight, height, and sex using the Boer formula, plus approximate fat mass.

Convert daily calories into grams of carbohydrate, protein, and fat for balanced, low-carb, or high-protein diet splits.

Predict your next 3 period start and end dates and your estimated ovulation day from your last period and average cycle length.

Calculate your running pace in minutes per kilometer, speed in km/h, and pace per mile from a distance and finish time.

Find the best bedtime or wake-up time using 90-minute sleep cycles. Wake between cycles, not mid-cycle, to feel more refreshed and less groggy.

Estimate your Total Daily Energy Expenditure (TDEE) from your BMR and activity level using the Mifflin-St Jeor equation, with calorie targets for weight loss, maintenance and gain.

Calculate the Ankle-Brachial Index (ABI) from ankle and arm systolic pressures to screen for peripheral arterial disease (PAD).

Calculate your Army Combat Fitness Test (ACFT) score for all six events and see your total out of 600.

Calculate the urine albumin-to-creatinine ratio (ACR) from a spot urine sample to assess kidney health and CKD albuminuria category.

Estimate VO₂max from the Queens College Step Test 3-minute protocol — enter your 15-second post-exercise pulse count to get your aerobic fitness category.

Calculate the Apnea-Hypopnea Index (AHI) from a sleep study and classify sleep apnea severity per AASM guidelines.

Calculate the Absolute Neutrophil Count (ANC) from a CBC differential and classify neutropenia severity.

Calculate the APRI score (AST-to-Platelet Ratio Index) to estimate the probability of liver fibrosis and cirrhosis.

Estimate your blood alcohol concentration (BAC) using the Widmark formula. Enter drinks, weight, sex and time elapsed.

Calculate your Body Adiposity Index (BAI) — an estimate of body fat percentage from hip circumference and height, requiring no scale.

Analyse your basal body temperature (BBT) reading against your follicular baseline to detect the post-ovulation thermal shift and estimate cycle phase.

Calculate Biologically Effective Dose (BED) and EQD2 for any radiation therapy fractionation schedule using the linear-quadratic model.

Estimate Basal Energy Expenditure using the revised Harris-Benedict equation with optional stress and activity factors for clinical nutrition.

Score the Brief Interview for Mental Status (BIMS), a CMS MDS 3.0 cognitive screening tool used in nursing homes — three parts, total 0–15.

Calculate your Body Roundness Index (BRI) from height and waist circumference — a shape-based body fat estimate that outperforms BMI.

Calculate body surface area (BSA) in m² using the Mosteller, Du Bois, or Haycock formula — with a side-by-side comparison of all three.

Calculate the age-adjusted Charlson Comorbidity Index (CCI) from patient age and weighted comorbid conditions. Estimates 10-year survival probability.

Estimate creatinine clearance (CrCl) and kidney function stage using the Cockcroft-Gault equation from age, sex, weight, and serum creatinine.

Look up the NIH Dietary Reference Intake (RDA/AI) for protein, fibre, vitamins, and minerals by age and sex.

Calculate your estimated due date and current pregnancy week using Naegele's rule, adjusted for your personal cycle length.

Estimate your kidney filtration rate (eGFR) using the CKD-EPI 2021 race-free equation from serum creatinine, age, and sex.

Calculate your new ELO rating and points gained or lost after a match using the standard ELO formula for win, draw, or loss.

Calculate power output, calories burned and distance for a rowing ergometer workout from your 500 m split time using the Concept2 formula.

Estimate how long EtG (ethyl glucuronide) remains detectable in urine after alcohol consumption, based on drinks consumed and time elapsed.

Calculate your daily fat intake in grams from total calories and a fat percentage target, with protein, carb, and saturated fat breakdowns.

Calculate the Front of Center (FOC) percentage for an arrow using length and balance point — essential for tuning accuracy and stability in archery.

Calculate a premature baby's corrected (adjusted) age by subtracting weeks born early from their chronological age.

Calculate the Glycemic Load (GL) of a food from its Glycemic Index (GI) and carbohydrate content per serving.

Calculate the Glucose Infusion Rate (GIR) in mg/kg/min from dextrose concentration, infusion rate, and patient weight.

Calculate the Glasgow Coma Scale score from eye, verbal, and motor responses to assess level of consciousness.

Calculate the Hepatic Steatosis Index (HSI) from ALT, AST, BMI, sex and diabetes status to screen for non-alcoholic fatty liver disease.

Calculate ICC(1,1) or ICC(1,k) from one-way ANOVA mean squares to assess inter-rater or test-retest reliability, plus SEM and MDC₉₅.

Calculate the validated ICH Score (0–6) from GCS, hemorrhage volume, IVH, location and age to estimate 30-day mortality risk.

Calculate the International Normalized Ratio (INR) from PT, mean normal PT, and ISI — with therapeutic range interpretation for warfarin monitoring.

Calculate the Injury Severity Score (ISS) from AIS region scores to classify trauma severity from minor to unsurvivable.

Estimate LDL cholesterol from Total Cholesterol, HDL and Triglycerides using the Friedewald equation (mg/dL or mmol/L).

Calculate the MCA-PSV Multiple of Median (MoM) for fetal anemia screening using the Mari 2000 formula. For use with specialist guidance.

Convert any opioid dose to morphine milligram equivalents (MME/day) using CDC 2022 conversion factors.

Calculate the Neutrophil-to-Lymphocyte Ratio (NLR) from CBC counts — a rapid blood-test marker for systemic inflammation.

Calculate NNT, NNH, ARR, RRR, Relative Risk and Odds Ratio from control and experimental event rates.

Calculate the real-world noise reduction and protected dBA level from a hearing protector's NRR rating, using NIOSH or EPA methods.

Interpret a post-void residual (PVR) bladder scan — residual fraction, estimated capacity, and clinical severity category.

Calculate the Physiological Strain Index (PSI) from core body temperature and heart rate to quantify heat stress during exercise or occupational heat exposure.

Calculate the heart-rate-corrected QT interval (QTc) using Bazett, Fridericia, Framingham or Hodges formula — with prolongation risk interpretation.

Calculate your Resting Metabolic Rate (RMR) and TDEE using Mifflin-St Jeor or Katch-McArdle — choose based on whether you know your body fat %.

Calculate your bone density T-Score from a DXA scan BMD (g/cm²) and get a WHO classification: normal, osteopenia, or osteoporosis.

Calculate the IV Alteplase (tPA) dose for acute ischemic stroke: total dose, IV bolus, and 60-minute infusion by patient weight.

Calculate the Urea Reduction Ratio (URR) from pre- and post-dialysis BUN values to assess haemodialysis adequacy against the KDOQI ≥ 65 % target.

Calculate wound area reduction (WAR%) from initial and current wound dimensions to track healing progress and apply the validated 4-week 40% threshold.