Health & Fitness

Calculate your Basal Metabolic Rate (BMR) using Mifflin-St Jeor, Harris-Benedict, or Katch-McArdle formula. Free online BMR calculator.

Calculate your Total Daily Energy Expenditure (TDEE) and get personalized calorie and macro targets for weight loss, maintenance, or muscle gain.

Calculate your body fat percentage using the US Navy or BMI method. Find your fat mass, lean mass, and fitness category. Free body fat estimator.

Calculate your ideal body weight using 4 proven formulas: Robinson, Miller, Devine, and Hamwi. Find the healthy weight range for your height.

Calculate your daily macronutrients (protein, carbs, fat) for your fitness goals. Free macro calculator for weight loss, muscle gain, keto, and more.

Calculate your estimated due date (EDD) from last period, conception date, or IVF transfer. Shows gestational age, trimesters, and key milestones.

Calculate how much water you should drink per day based on weight, activity, and climate. Get personalized daily hydration recommendations.

Calculate your 5 heart rate training zones based on age and resting heart rate. Uses simple max HR and Karvonen methods. Free cardio zone calculator.

Calculate calories burned during any exercise or activity. Uses MET values for 30+ activities including running, cycling, swimming, and everyday tasks.

Calculate running pace, distance, or finish time. Find your pace for 5K, 10K, half marathon, and marathon. Convert between km and miles.

Calculate your ovulation date and fertile window based on your cycle. See a 3-month forecast calendar. Free online ovulation predictor.

Calculate daily calorie needs from age, height, weight, and activity. Get your TDEE plus clear goals for loss, maintenance, or gain.

Find the best time to sleep or wake up based on 90-minute sleep cycles. Wake refreshed between cycles. Free and private.

Estimate your one-rep max from weight and reps using Epley and Brzycki formulas, plus a full percentage training table. Free and private.

Estimate blood alcohol concentration (BAC) from drinks, weight, sex, and time using the Widmark formula. For education only. Free and private.

Calculate your waist-to-hip ratio (WHR) and see your health risk band by sex. A quick body-shape health indicator. Free and private.

Convert A1C to estimated average glucose (eAG) and back, in mg/dL and mmol/L. Understand your blood sugar average. Free and private.

Track recommended pregnancy weight gain by week based on your pre-pregnancy BMI, using IOM guidelines. Educational only. Free and private.

Enter your systolic and diastolic readings to see your blood pressure category using ACC/AHA guidelines — from normal to hypertensive crisis. Private and instant.

Calculate body surface area (BSA) in m² from your height and weight using the Mosteller, Du Bois and Haycock formulas. Metric or imperial, in your browser.

Work out the daily calorie deficit and target intake needed to hit a weekly weight-loss goal. Enter your maintenance calories and target rate — in your browser.

Predict your next six period start dates, period length, and PMS window from your last period and average cycle. Free, private period tracker calculator.

Find how much protein to eat each day based on your body weight and activity goal, from general health to building muscle. Metric or imperial, in your browser.

See how much smoking costs per day, month, year, and over many years. Enter cigarettes per day, pack size, and price to reveal the true financial cost of smoking.

Estimate your VO₂ max and cardio fitness level from your age and resting heart rate using the Uth–Sørensen method. Private and instant, in your browser.

Calculate your waist-to-height ratio (WHtR) and see your category. A simple central-fat screen using the "keep your waist under half your height" rule.