A 220-pound man burns roughly 2,300 to 3,300 calories per day, depending almost entirely on how active he is. At rest, his body needs approximately 1,900 calories just to keep basic functions running. Everything on top of that comes from movement, exercise, and digesting food.
Your Baseline: Resting Metabolism
Your basal metabolic rate (BMR) is the number of calories your body burns doing absolutely nothing: breathing, circulating blood, maintaining body temperature, and keeping organs functioning. For a 220-pound man of average height (5’10”) and age (40), the widely used Mifflin-St Jeor equation puts BMR at roughly 1,900 calories per day. The formula works like this: (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + 5.
That number shifts meaningfully based on your height and age. A 25-year-old who’s 6’2″ and weighs 220 pounds would have a BMR closer to 2,100 calories. A 55-year-old at 5’8″ and the same weight would land closer to 1,750. The formula rewards height and youth because taller, younger bodies have more metabolically active tissue.
Activity Level Changes Everything
BMR only tells you what your body burns at complete rest. Your total daily energy expenditure (TDEE) accounts for all movement, from fidgeting at your desk to running five miles. Fitness organizations use standard multipliers to estimate TDEE from BMR:
- Sedentary (desk job, no exercise): BMR × 1.2 = about 2,300 calories
- Lightly active (light exercise 1–3 days per week): BMR × 1.375 = about 2,640 calories
- Moderately active (exercise 3–5 days per week): BMR × 1.55 = about 2,970 calories
- Very active (hard exercise 6–7 days per week): BMR × 1.725 = about 3,310 calories
- Extremely active (intense training or physical job): BMR × 1.9 = about 3,650 calories
For most 220-pound men with office jobs who work out a few times a week, the realistic range is 2,600 to 3,000 calories per day. If you’re honestly sedentary, meaning no planned exercise and mostly sitting, 2,300 is a better estimate. People tend to overestimate their activity level, so be honest with yourself when picking a category.
What Your Body Composition Adds Up To
Two men can both weigh 220 pounds and burn very different amounts of calories. The difference comes down to how much of that weight is muscle versus fat. A pound of muscle burns roughly 5 to 7 calories per day at rest, while fat tissue is far less metabolically active. That gap sounds small per pound, but it compounds quickly. A muscular 220-pound man carrying 30 extra pounds of lean mass compared to a less muscular man at the same weight could burn 150 to 200 more calories daily without doing anything extra.
Your internal organs actually account for a larger share of resting metabolism than muscle does. The brain, liver, heart, and kidneys burn 15 to 40 times more energy per pound than muscle tissue. You can’t change the size of your organs, but this explains why BMR formulas are estimates, not exact measurements. The only way to get a precise number is through indirect calorimetry, a breathing test sometimes offered at hospitals and sports medicine clinics.
Calories Burned Through Digestion
Your body spends energy breaking down and absorbing food, a process called the thermic effect of food. This typically accounts for about 10% of your total calorie intake, but the exact percentage depends on what you eat. Protein costs the most to digest, increasing your metabolic rate by 15 to 30% of the calories in that protein. Carbohydrates raise it by 5 to 10%, and fats by just 0 to 3%.
For a 220-pound man eating 2,500 calories a day, digestion alone burns somewhere between 200 and 300 calories. A higher-protein diet pushes that number toward the upper end, which is one reason protein-rich diets are associated with easier weight management.
How Age Affects the Number
The conventional wisdom that metabolism drops steadily after your 20s turns out to be wrong. A large-scale study published in Science found that total energy expenditure stays remarkably stable between ages 20 and 60 when adjusted for body size and composition. Your metabolism doesn’t meaningfully slow down during those four decades.
The real decline starts around age 60, when energy expenditure drops by about 0.7% per year. By age 90, adjusted calorie burn is roughly 26% lower than in middle age. What happens between 30 and 60 is not a metabolic slowdown but a gradual loss of muscle mass, which lowers BMR. That’s a body composition change you can fight with strength training, not an inevitable metabolic fate.
Putting the Numbers to Practical Use
If you’re trying to lose weight, your TDEE is the number that matters. Eating 500 calories below your TDEE produces roughly one pound of fat loss per week. For a moderately active 220-pound man burning around 2,900 calories daily, that means eating about 2,400 calories. Eating below your BMR (around 1,900) for extended periods is counterproductive for most people, as it typically leads to muscle loss, fatigue, and metabolic adaptation that makes continued weight loss harder.
If you’re trying to maintain your current weight, your TDEE is your target intake. Track your weight over two to three weeks while eating at your estimated TDEE. If your weight stays stable, you’ve found your number. If it drifts up or down, adjust by 100 to 200 calories and reassess. Calculators give you a starting point, but your scale over time gives you the real answer.