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The Difference Between BMR and TDEE

Quick Calculators Team
2 min read

When you start tracking calories to lose or gain weight, you will immediately run into two confusing acronyms: BMR and TDEE.

Many people mistakenly assume these two terms mean the same thing, but mixing them up will completely ruin your diet. Here is the exact difference between the two, and which one you should actually use to set your goals.

What is BMR? (Basal Metabolic Rate)

Your BMR is the absolute minimum number of calories your body needs to stay alive if you were in a coma.

It represents the energy required for your heart to beat, your lungs to breathe, and your brain to function while completely at rest. BMR is determined entirely by your age, gender, height, and weight.

For an average adult, BMR typically accounts for 60% to 70% of all the calories they burn in a day.

Crucial Rule: You should almost never eat fewer calories than your BMR. Doing so forces your body into "starvation mode," slowing down your metabolism and burning muscle for energy instead of fat.

What is TDEE? (Total Daily Energy Expenditure)

Your TDEE is the total number of calories you burn in a 24-hour period.

It takes your BMR and adds in every single physical movement you make throughout the day. This includes:

  1. NEAT (Non-Exercise Activity Thermogenesis): Fidgeting, walking to your car, typing, and standing up.
  2. TEF (Thermic Effect of Food): The calories your body burns just digesting the food you eat.
  3. EAT (Exercise Activity Thermogenesis): Intentional workouts like lifting weights or running.

If your BMR is 1,600 calories, but you walk 10,000 steps and lift weights, your TDEE might be 2,400 calories.

Which Number Do You Use?

If you want to change your weight, you always use your TDEE as your starting point, not your BMR.

  • To Lose Weight: Subtract 500 calories from your TDEE.
  • To Gain Muscle (Bulking): Add 300 to 500 calories to your TDEE.
  • To Maintain Weight: Eat exactly your TDEE.

Calculate Both Instantly

Figuring out your TDEE requires complex formulas like the Mifflin-St Jeor equation. Don't guess—use our free BMR Calculator to instantly discover your basal metabolic rate, and our Calorie Calculator to find your exact TDEE!