Health & Fitness Calculators

BMI Calculator

Calculate your Body Mass Index (BMI) and find out if you're at a healthy weight for your height.

Calorie Calculator

Estimate how many calories you need per day to maintain, lose, or gain weight.

Body Fat Calculator

Estimate your body fat percentage using body measurements with the US Navy method.

BMR Calculator

Calculate your Basal Metabolic Rate: the calories your body burns at complete rest.

TDEE Calculator

Calculate your Total Daily Energy Expenditure: how many calories you actually burn per day.

Ideal Weight Calculator

Find your ideal body weight range based on height and frame size using multiple formulas.

Macro Calculator

Calculate your daily protein, carbohydrate, and fat targets based on your goals.

Pace Calculator

Calculate running pace, finish time, or distance for any race from a 5K to a marathon.

Pregnancy Due Date Calculator

Calculate your estimated due date and pregnancy milestones from your last menstrual period or conception date.

Ovulation Calculator

Estimate your most fertile days and ovulation window based on your cycle length.

Conception Calculator

Estimate when conception occurred based on your due date or last menstrual period.

Target Heart Rate Calculator

Calculate your maximum and target heart rate zones for fat burn, cardio, and peak training.

Water Intake Calculator

Find out how much water you should drink per day based on weight, activity, and climate.

Sleep Calculator

Find the best times to wake up or go to sleep based on 90-minute sleep cycles.

BAC Calculator

Estimate Blood Alcohol Content (BAC) based on drinks consumed, time, weight, and gender.

One Rep Max Calculator

Calculate your one-rep maximum for bench press, squat, deadlift, or any lift.

Calories Burned Calculator

Estimate calories burned during running, cycling, swimming, walking, and more.

Protein Calculator

Find out how much protein you need per day for muscle building, maintenance, or weight loss.

Waist-to-Hip Ratio Calculator

Calculate your waist-to-hip ratio and assess your risk for cardiovascular disease.

Lean Body Mass Calculator

Calculate your lean body mass: the weight of everything in your body except fat.

Due Date Calculator

Calculate your pregnancy due date from last period, conception date, or IVF transfer date. Shows trimester milestones.

Period Calculator

Predict your next 6 period dates, fertile windows, and ovulation days based on cycle length.

Army Body Fat Calculator

Calculate body fat percentage using the U.S. Army circumference method. Includes Army standards by age and gender.

Carbohydrate Calculator

Calculate daily carbohydrate, protein, and fat intake in grams based on calorie goal and diet type.

Fat Intake Calculator

Calculate daily fat intake recommendations including total fat, saturated fat limit, and unsaturated fat targets.

Height Calculator

Predict adult height from current child height or parents' heights using the mid-parental height method.

Pregnancy Weight Gain Calculator

Calculate recommended pregnancy weight gain based on pre-pregnancy BMI using IOM guidelines. Track if you're on target.

Body Surface Area Calculator

Calculate body surface area using Mosteller, DuBois, and Haycock formulas. Used for drug dosing and medical assessment.

Healthy Weight Calculator

Find your ideal weight range using Hamwi, Devine, Robinson, and Miller formulas based on height and frame size.

GFR Calculator

Calculate estimated glomerular filtration rate (eGFR) using the CKD-EPI 2021 formula. Identifies kidney disease stage.

VO2 Max Calculator

Estimate your VO2 max using heart rate or the Cooper 12-minute test. Get your fitness category by age and gender.

Dog Age Calculator

Convert your dog's age to human years using size-adjusted formulas for small, medium, large, and giant breeds.

Cat Age Calculator

Convert your cat's age to human years using the AAFP formula. Find your cat's life stage from kitten to geriatric.

Blood Pressure Calculator

Check your blood pressure category using AHA guidelines. Get systolic/diastolic classification, pulse pressure, and mean arterial pressure.

Alcohol Unit Calculator

Calculate UK alcohol units, US standard drinks, grams of alcohol, estimated BAC, and hours to sober up from any drink.

Fiber Intake Calculator

Calculate your recommended daily fiber intake by age, gender, and calorie level. See high-fiber food sources and soluble vs. insoluble fiber.

IQ Score Calculator

Convert a raw test score to an IQ score and percentile rank using standardized mean and standard deviation. Includes preset test parameters.

Creatine Calculator

Calculate your creatine loading and maintenance doses by body weight. Compare loading vs. no-loading approaches.

Vitamin D Calculator

Estimate your vitamin D synthesis from sun exposure by location, skin tone, and time. Get NIH-based daily intake recommendations.