BMI & Calorie Calculator — Offline Health Tool

Know your BMI, your maintenance calories, and exactly how much to eat to lose, keep or gain weight. This clean calculator runs entirely in your browser — no app, no login, no subscription. Uses the trusted Mifflin-St Jeor formula, supports metric and imperial units, and gives you daily calorie targets for each goal. Works 100% offline on Windows, Mac, phone and tablet. Just download, double-click to open in any browser, and enter your details. For general guidance only — not medical advice.