Less guesswork.
More useful numbers.
Simple calculators for dates, health screening and everyday planning. Each tool explains its method and what the result can—and cannot—tell you.
Choose a calculator ↓Age calculator
Calculate age between two dates in calendar years, months and days.
Open calculator Health screeningAdult BMI calculator
Calculate BMI using metric or imperial measurements and understand its limits.
Open calculator Energy estimateDaily calorie calculator
Estimate adult maintenance calories with the formula and assumptions explained.
Open calculator Pregnancy planningPregnancy due date calculator
Estimate a due date from a last period or a known conception date.
Open calculatorKnow what your result means
Health calculators give estimates, not diagnoses. BMI does not measure body fat directly, calorie needs vary, and a due date is an estimate. Each page explains who the tool is for and when a clinician’s advice is needed.
Calculations run in your browser. The calculator does not submit the values you enter.
