About These Health Tools
Health data is about as personal as data gets. The TDEE calculator, due date calculator, and ovulation tracker all handle information you almost certainly wouldn’t want stored on a third-party server — your weight, age, menstrual cycle dates, conception timing.
All three tools process entirely in your browser. When you close the tab, the data is gone. No account means no database of your health information somewhere with a privacy policy you haven’t read.
About the Calculations
The TDEE calculator uses the Mifflin-St Jeor equation, the formula most widely recommended in clinical nutrition for estimating resting metabolic rate. Results are estimates — individual metabolism varies — but they’re calibrated starting points based on peer-reviewed methodology, not made-up numbers.
The due date calculator uses Naegele’s Rule (add 280 days to the first day of the last menstrual period), the standard method used in obstetric practice. Week-by-week developmental milestones are based on standard obstetric reference ranges.
The ovulation calculator estimates the fertile window based on your cycle length and typical luteal phase duration. Cycle length varies between individuals and month to month — use these estimates as a guide, not a medical diagnosis.
Frequently Asked Questions
Are these health calculators medically accurate?
The formulas used are standard clinical references (Mifflin-St Jeor for TDEE, Naegele’s Rule for due dates). They provide useful estimates, not medical diagnoses. Consult a healthcare professional for medical decisions.
Is my health data stored anywhere?
No. All calculations happen in JavaScript in your browser tab. No health data is transmitted to any server or stored anywhere.