Health Calculators

BMI Calculator

Body Mass Index calculator with healthy weight ranges and visual feedback.

Water Intake Calculator

Calculate your recommended daily water intake based on weight, activity, and climate.

Sleep Calculator

Calculate optimal bedtime or wake-up time based on 90-minute sleep cycles.

Calorie Deficit Calculator

Calculate your calorie deficit for weight loss with weekly fat loss projections.

Steps to Calories Calculator

Convert steps walked into calories burned, distance, and time spent.

Running Pace Calculator

Calculate running pace, finish time, and splits for any distance.

Calories Burned Calculator

Calculate calories burned for 30+ activities based on weight and duration.

Body Surface Area (BSA) Calculator

Calculate your body surface area using the Mosteller and Du Bois formulas

GFR Calculator (eGFR)

Estimate glomerular filtration rate (eGFR) to assess kidney function

A1C Calculator

Convert A1C to estimated average blood glucose (eAG) and back

Waist-to-Height Ratio Calculator

Calculate your waist-to-height ratio — a simple indicator of health risk

Intermittent Fasting Calculator

Plan your fasting and eating windows for 16:8, 18:6, OMAD and more

Weight Loss Calculator

Find the daily calories and time needed to reach your goal weight

Pack Year Calculator

Calculate smoking pack-years from cigarettes per day and years smoked

Smoking Cost Calculator

See how much smoking costs you per day, month, year and lifetime

Blood Sugar Converter

Convert blood glucose between mg/dL and mmol/L instantly

Mean Arterial Pressure (MAP) Calculator

Calculate mean arterial pressure from systolic and diastolic readings

Ponderal Index Calculator

Calculate the Ponderal Index — a height-adjusted measure of leanness

Body Roundness Index (BRI) Calculator

Calculate your Body Roundness Index from height and waist circumference

Child BMI Calculator

Calculate BMI for children and teens with age- and sex-based categories

Blood Volume Calculator

Estimate total blood volume using the Nadler and Gilcher formulas

BMI Prime Calculator

Calculate BMI Prime — your BMI as a ratio of the upper healthy limit

Child Height Predictor

Predict a child’s adult height using the mid-parental height method

Sobriety Calculator

Count exactly how long you have been sober — days, months and years

Calorie Calculator

Daily calorie needs (TDEE) based on age, weight, height and activity level

Body Fat Calculator

Estimate body fat percentage using the U

BMR Calculator

Calculate Basal Metabolic Rate — calories your body burns at complete rest

Ideal Weight Calculator

Calculate your ideal body weight using Devine, Robinson, Miller, and Hamwi formulas

Pregnancy Due Date Calculator

Calculate your estimated due date, conception date, and current trimester

Ovulation Calculator

Estimate your ovulation day, fertile window, and best days to conceive

Macro Calculator

Calculate daily protein, fat, and carb targets based on your fitness goals

Protein Intake Calculator

Calculate your daily protein needs based on weight, activity, and goals

Heart Rate Zone Calculator

Calculate your 5 heart rate training zones for fat burn, cardio, and peak

One Rep Max Calculator

Calculate your one-rep max using Brzycki, Epley, and Lombardi formulas

Alcohol Units Calculator

Calculate alcohol units consumed and compare against weekly guidelines

Period Calculator

Predict your next period, fertile window, and ovulation date

TDEE Calculator

Calculate your Total Daily Energy Expenditure (TDEE) for fat loss or muscle gain

Pregnancy Weight Gain Calculator

Track healthy pregnancy weight gain based on your pre-pregnancy BMI

Conception Date Calculator

Estimate your exact conception date based on your ultrasound or due date

BAC Calculator

Estimate your Blood Alcohol Content (BAC) based on weight and drinks consumed

VO2 Max Calculator

Calculate your cardiovascular fitness level and VO2 Max estimate

Blood Pressure Category Calculator

Calculate your blood pressure category based on AHA guidelines

Cholesterol Ratio Calculator

Calculate your total cholesterol to HDL ratio

Lean Body Mass Calculator

Calculate your Lean Body Mass (LBM) using the Boer formula

Keto Macro Calculator

Calculate your macronutrient targets for a ketogenic diet

Pregnancy Trimester Calculator

Find out which trimester you are in and important milestones

Maximum Heart Rate Calculator

Calculate your maximum heart rate and training zones

Waist-to-Hip Ratio Calculator

Calculate your Waist-to-Hip Ratio (WHR) to assess health risks

Army Body Fat Calculator

Calculate body fat percentage using US Army standards

Blood Type Predictor

Predict possible blood types for a child based on parents

Due Date by Ultrasound Calculator

Calculate pregnancy due date based on ultrasound measurements