Health

BMI Calculator online: estimate body mass index from height and weight. Fast, free and easy to use on NtoolBox.

BMR Calculator online: calculate basal metabolic rate and daily energy expenditure. Fast, free and easy to use on NtoolBox.

Daily Water Intake Calculator online: estimate daily water intake from weight and activity level. Fast, free and easy to use on NtoolBox.

Daily Calorie Calculator online: estimate daily calories for maintenance, weight loss or gain. Fast, free and easy to use on NtoolBox.

Calculate your ideal body weight using Devine, Robinson and Miller formulas. Enter your height and gender to get your healthy weight range instantly.

Calculate your pregnancy due date, current week, trimester and days remaining. Based on Naegele's rule (LMP + 280 days). Free, instant, no registration.

Find the best time to sleep or wake up based on 90-minute sleep cycles. Enter your wake-up or bedtime and get instant recommendations. Free sleep calculator.

Calculate your body fat percentage with the US Navy method. Enter height, waist and neck measurements — instant result with category rating. Free online body fat calculator.