What Is a TDEE Calculator?
A TDEE calculator estimates your Total Daily Energy Expenditure — the total number of calories you burn in a day including exercise and daily activity. Knowing your TDEE is the foundation of any weight loss, maintenance, or muscle gain goal, because it tells you exactly how many calories your body needs to stay at its current weight.
TDEE vs. BMR: What Is the Difference?
Your Basal Metabolic Rate (BMR) is the number of calories your body burns at complete rest just to keep your organs functioning. Your TDEE takes that BMR and multiplies it by your activity level to account for exercise, walking, and even fidgeting. In other words, BMR is the floor and TDEE is the full picture of your daily calorie burn.
How to Choose Your Activity Level
Selecting the right activity multiplier is important for accuracy. Sedentary people get little formal exercise, while moderately active people exercise three to five days a week. If you sit at a desk all day but lift weights four times a week, "moderately active" is usually the best choice. When in doubt, choose the lower level — it is safer to slightly underestimate your calorie burn.
Calorie Targets for Weight Loss and Muscle Gain
To lose weight, you need a calorie deficit, typically 250-500 calories below your TDEE per day, which yields roughly half a pound to one pound of fat loss per week. To build muscle, add a modest surplus of 250-500 calories. Avoid cutting calories too far below your BMR, as this can slow your metabolism and make sustained fat loss harder.
Understanding Your Macronutrients
Alongside calories, this calculator suggests protein, carbohydrate, and fat targets. Protein supports muscle repair, carbohydrates fuel your workouts, and fat regulates hormones. These are starting points you can adjust based on how your body responds over several weeks of consistent tracking.
FAQs
Is TDEE the same as maintenance calories?
Yes. Eating at your TDEE maintains your current weight; eating below it leads to loss and above it leads to gain.
How accurate is the Mifflin-St Jeor formula?
It is one of the most accurate BMR formulas for the general population, though individual metabolism can vary.
For more nutrition planning, try our calorie calculator, BMR calculator, and macro calculator.