Health
BMI, Calorie, BMR, Body Fat, Pregnancy Due Date and more
BMI Calculator
Enter your height and weight to instantly calculate your Body Mass Index (BMI) and check your classification as underweight, normal, overweight, or obese, plus your healthy weight range.
Calorie Calculator
Calculate your daily calorie needs (TDEE) from age, gender, height, weight, and activity level to plan your diet for weight loss or gain. Free online calorie calculator that's easy to use.
BMR Calculator
Calculate your Basal Metabolic Rate (BMR) from age, gender, height, and weight using the Mifflin-St Jeor formula to find how many calories your body burns at rest. Free online tool.
Body Fat Calculator
Calculate your body fat percentage from gender, waist, neck, and hip circumference, and height using the U.S. Navy method to analyze body composition. Free online body fat calculator.
Ideal Weight Calculator
Calculate your ideal body weight from height and gender using the Devine, Robinson, Miller, and Hamwi formulas. Get a healthy target weight range to guide your fitness goals with this free calculator.
Pregnancy Due Date Calculator
Enter your last menstrual period or conception date to find your estimated due date based on 280 days (40 weeks), with your current pregnancy week and trimester.
Sleep Calculator
Enter your wake-up or bedtime to find the optimal sleep and wake times based on 90-minute sleep cycles, so you finish a full cycle and wake up refreshed and alert.
Water Intake Calculator
Calculate your recommended daily water intake based on your weight and activity level. Stay properly hydrated for optimal health and performance. Free online water intake calculator.
Macro Calculator
Calculate your daily macronutrient targets for carbs, protein, and fat in grams. Enter your age, weight, activity level, and goal to get a personalized macro split with this free macro calculator.
Heart Rate Zone Calculator
Calculate your personalized heart rate training zones from your age and resting heart rate. Get all five target zones, from warm-up to maximum effort, using the Karvonen formula with this free tool.
Pregnancy Weight Gain Calculator
Enter your pre-pregnancy weight, height, and current week to see the IOM-recommended gain range for your BMI category and track healthy weight gain week by week.
Pace Calculator
Enter your running distance and time to calculate your pace in minutes per km or mile. Convert between distance, time, and pace to plan your marathon goals.
Waist-Hip Ratio Calculator
Enter your waist and hip measurements to calculate your waist-hip ratio (WHR). Assess your abdominal obesity and cardiovascular health risk. Free online WHR calculator for health.
One Rep Max Calculator
Enter your lifting weight and reps to estimate your 1RM (one-rep max) using the Epley, Brzycki, and Lander formulas. Gauge your strength with this free 1RM calculator.
Ovulation Calculator
Enter your last period date and cycle length to predict your ovulation day and fertile window. Plan your conception or track your cycle with this free ovulation calculator.