Estimates you can check yourself, using the published equations behind them. Nothing you enter leaves your device, and every page links the medical or scientific source it relies on.
The BMI calculator gives the World Health Organization weight categories from height and weight, and explains where BMI misleads — muscular builds and older adults especially. For a closer look at composition, the body fat calculator uses the US Navy circumference method. The calorie calculator applies the Mifflin-St Jeor equation to estimate basal metabolic rate, then an activity factor for total daily energy expenditure. The sleep calculator counts backwards in 90-minute cycles so you wake between cycles rather than inside deep sleep, and the ovulation and pregnancy tools work from your last menstrual period using standard clinical dating. All of them are informational: they do not replace advice from a qualified healthcare professional.