Free TDEE Calculator Online
Free TDEE Calculator Online is a free online tool by US AI. TDEE stands for Total Daily Energy Expenditure — the total calories your body burns in 24 hours. This calculator first estimates your BMR (Basal Metabolic Rate) using the science-backed Mifflin-St Jeor equation, then multiplies it by your activity level to give your true daily calorie burn. Whether your goal is fat loss, muscle gain, or simply maintaining a healthy weight, knowing your TDEE is the single most useful number in nutrition. It runs completely in your browser — no signup, no download, works on mobile and desktop.
📖 How to use
- Enter your weight, height, age and sex, then pick the activity level that best matches your week.
- Press Calculate — your BMR and TDEE appear instantly, with cut, maintain and bulk calorie targets.
- Your work stays on your device; nothing is uploaded anywhere.
✨ Why use this tool?
US AI's free TDEE calculator uses the Mifflin-St Jeor formula trusted by dietitians worldwide. It is fast, private and 100% free forever. Pair it with our calorie and macro calculators to build a complete nutrition plan. Bookmark this page and share it with anyone starting a fitness journey.
❓ TDEE FAQs
What is the difference between BMR and TDEE? BMR is what you burn at complete rest; TDEE adds everything else — work, exercise, walking and digestion. TDEE is always higher than BMR.
How accurate is this calculator? The Mifflin-St Jeor equation is accurate within about 10% for most people. Track your weight for two weeks and adjust up or down based on real results.