# Calorie & TDEE Calculator Estimate your daily calorie burn (BMR and TDEE) with the Mifflin–St Jeor equation, and see calorie targets for losing, maintaining or gaining. All in your browser. Estimates only — not medical advice. Individual needs vary; consult a professional for a personalised plan. ### How it works Your **BMR** (basal metabolic rate — calories at complete rest) uses the modern **Mifflin–St Jeor** equation: `10×kg + 6.25×cm − 5×age`, then `+5` for men or `−161` for women. Multiplying by an activity factor (1.2–1.9) gives **TDEE**, your total daily burn. A ~500 kcal daily deficit or surplus corresponds to roughly half a kilo per week. All computed on your device. --- *Source: [ocxly.com/calorie-calculator.html](https://ocxly.com/calorie-calculator.html) — OCXLY, free 100% client-side privacy-first tools. Free calorie and TDEE calculator using the Mifflin-St Jeor equation. Estimate BMR, maintenance calories and targets for losing or gaining weight, entirely in your browser.*