• 01

  BMI

  Calculate your Body Mass Index (BMI) from height and weight, in metric or imperial units. See your WHO weight category and healthy weight range.

  Calculate →
• 02

  BMR

  Calculate your Basal Metabolic Rate (BMR) — the calories your body burns at rest — using the Mifflin-St Jeor equation, with Harris-Benedict as an alternate.

  Calculate →
• 03

  TDEE

  Calculate your Total Daily Energy Expenditure (TDEE) — the calories you burn per day — from BMR and activity level, plus weight-loss and weight-gain targets.

  Calculate →

• 01 A1C / eAG Convert between A1C percentage and estimated average glucose (eAG) in mg/dL or mmol/L using the ADA-validated formula. Health →
• 02 Alcohol Calorie Calculate calories in alcoholic drinks from ABV%, serving volume, and drink count. See your session total, alcohol grams, and standard US drinks. Health →
• 03 BAC Estimate blood alcohol content using the Widmark formula. For harm-reduction awareness only — never use to decide whether to drive. Health →
• 04 Biological Age Estimate your biological age from your date of birth and lifestyle factors including exercise, sleep, diet, smoking, and stress. See how your habits affect your estimated functional age. Health →
• 05 Blood Pressure Check your blood pressure reading against the ACC/AHA 2017 guidelines. Enter your systolic and diastolic numbers to find your category — Normal, Elevated, Stage 1, Stage 2, or Crisis. Health →
• 06 Blood Sugar Converter Convert blood glucose between mg/dL and mmol/L, and convert A1C to estimated average glucose (eAG) or vice versa. For informational use only. Health →
• 07 BMI Calculate your Body Mass Index (BMI) from height and weight, in metric or imperial units. See your WHO weight category and healthy weight range. Health →
• 08 BMI Prime Calculate your BMI Prime — the ratio of your BMI to 25 — for a quick "how far from normal" measure alongside a plain-language interpretation and your ideal weight at a target BMI Prime. Health →
• 09 BMR Calculate your Basal Metabolic Rate (BMR) — the calories your body burns at rest — using the Mifflin-St Jeor equation, with Harris-Benedict as an alternate. Health →
• 10 Body Adiposity Index (BAI) Estimate body fat percentage using the BAI formula (Bergman 2011) from hip circumference and height alone — no weight required. Supports metric and imperial units. Health →
• 11 Body Fat Estimate your body fat percentage with the US Navy circumference method from neck, waist, hip, and height measurements, in metric or imperial units. Health →
• 12 Body Frame Size Determine your body frame size — small, medium, or large — using either the elbow-breadth method (a measured bone width) or the wrist-to-height ratio method. Useful context for interpreting ideal body weight ranges. Health →
• 13 Body Surface Area Estimate your body surface area in square metres using the Mosteller and Du Bois formulas. For informational use — not for clinical drug dosing. Health →
• 14 Calorie Cycling Calculate high-day and low-day calorie targets for a calorie-cycling (zigzag dieting) protocol from your weekly calorie goal and split pattern. Health →
• 15 Calorie Deficit Calculate your daily calorie deficit or surplus from your TDEE and target intake, and estimate how long it will take to reach your weight goal. Health →
• 16 Calories Burned Estimate calories burned during exercise using the MET method. Select from 20+ activities, enter your weight and duration. Health →
• 17 Calories From Macros Calculate total calories from grams of protein, carbohydrates, and fat. See your macro ratio split and compare to a calorie goal. Health →
• 18 Cardio Training Load Score your cardio session by heart rate effort, not just speed or calories. Uses the TRIMP method to award points based on how hard you actually worked relative to your heart rate reserve. Health →
• 19 Cholesterol Ratio Calculate your Total/HDL and LDL/HDL cholesterol ratios with AHA risk-band interpretation — enter your cholesterol panel numbers to understand your cardiovascular risk profile. Health →
• 20 Conception Estimate your likely conception date and fertile window from a due date or last menstrual period (LMP). Informational only — not for contraception. Health →
• 21 Creatine Dose Calculate your creatine loading phase dose and daily maintenance dose based on body weight — using the ISSN evidence-based per-kilogram protocol. Health →
• 22 Due Date from Ultrasound Calculate your estimated due date from a first-trimester ultrasound crown-rump length (CRL) or gestational age measurement. Uses the Hadlock 1992 CRL formula per ACOG guidance. Health →
• 23 Healthy Weight Range Find the healthy weight range for your height using the WHO BMI normal band (18.5–24.9), with your position in the range and how much weight gain or loss would bring you within it. Health →
• 24 Heart Rate Zones Calculate your 5 training heart rate zones from age-predicted max HR (Fox or Tanaka formula). Shows bpm boundaries and training purpose for each zone. Health →
• 25 Hydration Calculate your recommended daily water intake based on body weight, activity level, and climate. Adjusts for exercise and hot or humid environments using NAM / IOM and ACSM guidelines. Health →
• 26 Ideal Weight Estimate your ideal body weight from height and biological sex using the Devine, Robinson, and Hamwi clinical formulas, in metric or imperial units. Health →
• 27 IVF Due Date Calculate your estimated due date from your IVF embryo transfer date. Supports day-5 blastocyst, day-3 cleavage, and day-0 fresh transfers with ACOG / ASRM formula. Health →
• 28 Keto Macro Calculate your daily keto macro targets — net carbs, protein, and fat in grams — from your calorie goal and macro percentages. Health →
• 29 Lean Body Mass Calculate your lean body mass — total weight minus body fat — using the Boer and James clinical formulas, in metric or imperial units. Health →
• 30 Macronutrient Convert a daily calorie target into protein, carbohydrate, and fat gram targets using a customisable macro split. Health →
• 31 Max Heart Rate Calculate your age-predicted maximum heart rate using three formulas — Fox (220−age), Tanaka (208−0.7×age), and Gellish (207−0.7×age) — and compare the results side-by-side. Health →
• 32 Net Carbs Calculate net carbs by subtracting dietary fiber and sugar alcohols from total carbohydrates. Track net carb intake for keto and low-carb diets. Health →
• 33 One-Rep Max Estimate your one-rep max (1RM) from any weight and rep count using six sports-science formulas — Brzycki, Epley, Lombardi, Mayhew, O'Conner, and Wathan — in lb or kg. Health →
• 34 Ovulation Estimate your ovulation date and fertile window from your last menstrual period and cycle length. Health →
• 35 Pace Calculate your running or walking pace in minutes per mile or per kilometre, and your speed in mph or km/h. Enter any distance and time. Health →
• 36 Period Predictor Predict your next period and fertile window from your last menstrual period date and average cycle length. Estimates ovulation date and days until your next cycle. Health →
• 37 Postpartum Weight Loss Estimate your postpartum weight-loss timeline and daily calorie guidance based on ACOG 2015 guidelines. Adjusts for breastfeeding status and IOM recommended rate of 1 lb/week. Health →
• 38 Pregnancy Due Date Estimate your baby's due date using Naegele's Rule (LMP + 280 days) or your conception date. Adjusts for non-28-day cycles. Health →
• 39 Pregnancy Weight Gain Calculate your recommended pregnancy weight gain range by pre-pregnancy BMI using IOM 2009 guidelines. Track how much weight gain is expected each week. Health →
• 40 Protein Intake Find your daily protein target in grams based on body weight and activity level, using ISSN and USDA reference ranges. Health →
• 41 Race Time Predictor Predict your finish time at any race distance from a recent result using the Riegel formula. Supports 800 m through 100 miles plus custom distances. Health →
• 42 Sleep Cycle Find the best time to go to sleep or wake up based on 90-minute sleep cycles. Uses sleep-onset latency to recommend times that complete full REM cycles. Health →
• 43 Sleep Debt Track your cumulative sleep debt by logging actual vs. target hours over multiple nights. See total hours owed and how long recovery will take. Health →
• 44 Sleep Needs by Age Look up the National Sleep Foundation recommended sleep hours for your age group and see if you're getting enough sleep with a surplus or deficit readout. Health →
• 45 Steps to Miles Convert steps to miles or kilometers and estimate calories burned. Stride length is calculated from your height and sex using the ACSM formula. Health →
• 46 Swimming Pace Calculate your swim pace per 100 m or per 100 yd from distance and finish time. Generates a lap-by-lap splits table for metric and yards pools. Health →
• 47 Target Heart Rate Find your aerobic training zones using the Karvonen heart rate reserve method. Shows five intensity zones from light to maximal, with Fox and Tanaka max-HR options. Health →
• 48 TDEE Calculate your Total Daily Energy Expenditure (TDEE) — the calories you burn per day — from BMR and activity level, plus weight-loss and weight-gain targets. Health →
• 49 VO2max Estimate your VO₂max (maximal oxygen uptake) using the Cooper 12-minute run, Rockport 1-mile walk test, or the heart rate ratio method. Get your cardiovascular fitness category. Health →
• 50 Waist-to-Height Ratio Calculate your waist-to-height ratio (WHtR) and see your health-risk category. The simple "keep your waist less than half your height" rule. Supports metric and imperial. Health →
• 51 Waist-to-Hip Ratio Calculate your waist-to-hip ratio and see your WHO metabolic risk category. Supports metric and imperial measurements. Health →
• 52 Water Intake Get your daily water target from the body-weight method and the IOM Adequate Intake, in oz or millilitres. Health →