Plain-language guides for every calculator

See how many grams of protein, fat and carbohydrates you need to maintain muscle, support hormones and fuel training.

Estimate how many calories you really burn in a day and use that baseline to design safe deficits or surpluses.

Understand what the Body Mass Index really shows, what each range means and how to combine it with other metrics for better decisions.

Use your last menstrual period or an early ultrasound to estimate the delivery date and map prenatal visits.

Calculate the exact week of pregnancy and learn which medical checks align with each stage.

Use WHO percentiles to interpret weight, length/height and head circumference and know when to call the pediatrician.