Health Tools
Quick, private health checks that run entirely in your browser. Check your Body Mass Index with standard and Asian charts, estimate your daily calorie burn for maintenance, weight loss or muscle gain, and estimate a pregnancy due date from the last menstrual period. Your health details never leave your device. These tools are for guidance only — always talk to a qualified professional about health decisions.
Reading your health numbers in context
A health number is only useful next to the context that explains it. The BMI Calculator gives you the standard chart reading, but the guide below explains when that number misleads — for athletes, older adults and teenagers — and when a waist measurement says more.
The BMR & Calorie Calculator estimates the energy you burn at rest, the starting point for any sensible calorie target, and the Age Calculator gives your exact age in years, months and days for the forms that insist on it. The Pregnancy Due Date Calculator estimates a due date from a last menstrual period. None of these replace a clinician; they help you arrive at the appointment with better questions.
Guides from the blog
- How to Calculate Your Due Date: Naegele's Rule, Trimesters and the 280-Day Count — Naegele's rule worked in full — 1 January 2026 + 280 days = 8 October 2026, with conception and trimester dates and why only about 5% of babies arrive on the day.
- How to Calculate BMR: The Mifflin-St Jeor Formula, TDEE and Calorie Targets — Mifflin-St Jeor worked in full — 1,699 calories at rest becomes a 2,633 TDEE, with the ±500 ladder for losing or gaining half a kilo a week.
- How to Calculate Age Exactly — Years, months and days, the leap-year trap, and why dividing by 365.25 fails.
- BMI Chart Explained: What Your Number Really Means — The standard cut-offs, when they mislead, and how to read your number correctly.