Health
20 free health calculators. No signup required.
BMI Calculator
Calculate your Body Mass Index using height and weight in imperial or metric units.
Calorie Calculator
Calculate your daily calorie needs (TDEE) for weight loss, maintenance, or muscle gain.
Ovulation Calculator
Estimate your ovulation date, fertile window, and next period based on your cycle length.
TDEE Calculator
Find your Total Daily Energy Expenditure — the calories you burn per day based on your stats and activity level.
BMR Calculator
Calculate your Basal Metabolic Rate — the calories your body burns at complete rest.
Ideal Weight Calculator
Find your ideal weight range by height and gender using four established formulas.
Body Fat Calculator
Estimate your body fat percentage using the US Navy tape-measure method.
Water Intake Calculator
Find your recommended daily water intake based on body weight and activity level.
Sleep Calculator
Find the ideal bedtime or wake-up time based on 90-minute sleep cycles.
Due Date Calculator
Estimate your pregnancy due date, current week, and trimester from your last menstrual period.
Macro Calculator
Find your daily protein, carbohydrate, and fat targets in grams based on your calorie goal.
Pace Calculator
Calculate your running pace, finish time, or distance from any two values. Supports miles, kilometers, and common race distances.
Calorie Burn Calculator
Find how many calories you burn during any exercise based on activity, duration, and body weight.
Heart Rate Zone Calculator
Calculate your 5 heart rate training zones from your age and resting heart rate using the Karvonen formula.
Calorie Deficit Calculator
Find your daily calorie goal to lose weight at your chosen pace. Enter your TDEE and target weight for a personalized plan.
BAC Calculator
Estimate your blood alcohol content (BAC) from drinks, body weight, sex, and time using the Widmark formula.
Pregnancy Weight Gain Calculator
Find your recommended pregnancy weight gain range based on pre-pregnancy BMI using IOM guidelines. Track expected gain by week.
One Rep Max Calculator
Estimate your one-rep max (1RM) for any lift from weight and reps using multiple proven formulas.
Protein Calculator
Calculate your daily protein intake goal based on body weight, activity level, and fitness objective.
Dog Age Calculator
Convert your dog's age to human years based on breed size using the latest scientific research.