Health
Health Calculators
Use transparent screening estimates with clearly stated methods and limitations.
63 tools
A1c Calculator
A1c calculator: estimated average glucose from HbA1c.
Baby Formula Calculator
Baby formula calculator: ounces per feeding from baby weight.
Blood Alcohol Content Calculator
Blood alcohol content (BAC) calculator: Widmark estimate from drinks, weight, and time \u2014 informational only.
Blood Pressure Category Calculator
Blood pressure category calculator: classify a systolic/diastolic reading using the AHA categories.
Blood Sugar Converter
Blood sugar converter: convert glucose between mg/dL and mmol/L instantly.
Body Surface Area Calculator
Body surface area calculator: Mosteller formula from height and weight.
Bra Size Calculator
Bra size calculator: band and cup size from underbust and bust measurements.
Caffeine Half-Life Calculator
Caffeine half-life calculator: how much caffeine remains in your system over time.
Calorie Deficit Calculator
Calorie deficit calculator: weight-loss timeline from daily deficit and target pounds.
Calorie Target Calculator
Calorie target calculator: maintenance, deficit, and surplus targets from weight, height, age, and activity.
Cholesterol Ratio Calculator
Cholesterol ratio calculator: total-to-HDL and LDL-to-HDL ratios from a lipid panel.
Conception Calculator
Conception calculator: conception date and fertility window from due date.
Cycling Calories Calculator
Cycling calories calculator: calories burned cycling by weight and time.
Daily Water Intake Calculator
Daily water intake calculator: estimate hydration needs from body weight and activity.
Fasting Window Calculator
Fasting window calculator: eating window from fast start and length.
Fetal Weight Calculator
Fetal weight calculator: estimated baby weight from ultrasound (Hadlock).
Frame Size Calculator
Frame size calculator: small, medium, or large body frame from wrist.
GFR Calculator
eGFR calculator (CKD-EPI 2021): estimated kidney filtration rate from creatinine, age, and sex.
Gestational Age Calculator
Gestational age calculator: weeks pregnant and due date from last period.
Gym Cost Per Visit Calculator
Gym cost per visit calculator: is your membership actually worth it?
Heart Rate Recovery Calculator
Heart rate recovery calculator: HR drop after exercise.
Heart Rate Zones Calculator
Heart rate zones calculator: target training zones from age and resting heart rate, computed locally.
Intermittent Fasting Calculator
Intermittent fasting calculator: convert between eating windows and fasting hours.
Lean Body Mass Calculator
Lean body mass calculator: LBM from weight and height (Boer).
Macro Split Calculator
Macro split calculator: carbs from calories, protein, and fat targets.
Maintenance Calories Calculator
Maintenance calories calculator: calories to hold your weight (Mifflin-St Jeor).
Mean Arterial Pressure Calculator
Mean arterial pressure calculator: MAP from systolic and diastolic.
Medicine Dosage Calculator
Medicine dosage calculator: dose from body weight and mg/kg dosing instructions.
Menstrual Cycle Calculator
Menstrual cycle calculator: next period and estimated fertile window (private, no tracking stored).
Metabolic Age Calculator
Metabolic age calculator: how your BMR compares to your age group.
Period Cycle Calculator
Period cycle calculator: estimate the next period and fertile window from cycle length.
Pollen Forecast Calculator
Pollen forecast calculator: current pollen levels for any city.
Pregnancy Due Date Calculator
Pregnancy due date calculator: estimate the due date from the first day of the last menstrual period.
Pregnancy Weight Gain Calculator
Pregnancy weight gain calculator: IOM recommended ranges by BMI and week.
Protein Shake Calculator
Protein shake calculator: protein per shake from scoops.
Pulse Pressure Calculator
Pulse pressure calculator: the gap between systolic and diastolic.
Sensitivity Specificity Calculator
Sensitivity and specificity calculator: diagnostic test performance.
Sleep Cycle Calculator
Sleep cycle calculator: find ideal bedtimes that end on a 90-minute sleep cycle for your wake time.
Sleep Cycle Calculator
Sleep cycle calculator: best bedtime to wake refreshed in 90-minute cycles.
Sleep Debt Calculator
Sleep debt calculator: accumulated lost sleep from target hours, actual hours, and days tracked.
Sleep Length Calculator
Sleep length calculator: hours and minutes from sleep cycles, plus when to wake.
Sodium Calculator
Sodium calculator: mg sodium to salt grams and daily value.
Steps to Miles Calculator
Steps to miles calculator: distance walked and calories burned from step count.
Stride Length Calculator
Stride length calculator: stride from height for walking or running.
Sugar in Drinks Calculator
Sugar in drinks calculator: teaspoons and daily value from grams.
Sunscreen SPF Calculator
Sunscreen SPF calculator: burn protection time and reapplication.
Swimming Calories Calculator
Swimming calories calculator: calories burned swimming by weight and time.
UV Exposure Calculator
UV exposure calculator: minutes until sunburn by UV index and Fitzpatrick skin type.
VO2 Max Calculator
VO2 max calculator: estimate aerobic fitness from a 12-minute run or resting heart rate.
VO2 Max Calculator
VO2 max calculator: estimate from a 12-minute Cooper test.
Vitamin D Calculator
Vitamin D calculator: IU to mcg conversion with daily reference.
Waist Hip Ratio Calculator
Waist to hip ratio calculator: WHR and health risk category.
Waist to Height Ratio Calculator
Waist-to-height ratio calculator: assess abdominal obesity risk from waist and height.
Walking Calories Calculator
Walking calories calculator: calories burned walking by weight and time.
Weight Loss Timeline Calculator
Weight loss timeline calculator: how long a healthy weekly deficit will take.
BMI Calculator
Calculate BMI quickly and privately in your browser.
BMR & TDEE Calculator
Estimate adult BMR and TDEE from the Mifflin-St Jeor equation and an explicit activity multiplier.
Body Fat Estimate Calculator
Estimate adult body-fat percentage with the U.S. Navy circumference method and clear limitations.
Calorie Calculator
Estimate daily calories and macros from simple inputs.
Macro Planning Calculator
Allocate a user-selected adult calorie total across configurable protein, fat, and carbohydrate assumptions.
Pregnancy Calculator
Estimate your pregnancy due date and current week from your last period, conception date, or a known due date. Private, no account.
Ideal Weight Calculator
Estimate your ideal body weight using seven common formulas (Hamwi, Devine, Robinson, Miller, Broca, Lorentz, Peterson) plus a healthy BMI range.
Pace Calculator
Calculate your running pace per km or mile from distance and time, plus speed and predicted race times.